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Author: Mark Valderrama

  • Aquascape Ideas: The 5 Main Styles and How to Set Each One Up

    Aquascape Ideas: The 5 Main Styles and How to Set Each One Up

    Aquascaping is one of the more creative sides of this hobby, and something I’ve spent a lot of time experimenting with over the years. My personal approach leans toward the natural planted style. soil capped with gravel or sand, low-tech, letting the plants do the heavy lifting. But there’s a whole spectrum here, from the highly structured Dutch style to wild jungle scapes, and each approach has its own philosophy, equipment requirements, and skill level.

    Whether you’re setting up your first planted tank or trying to give an existing one a real visual identity, understanding the five main styles will help you pick a direction that fits your budget, patience, and goals. Here’s a breakdown of each.

    Key Takeaways

    • Aquascaping is an underwater living art form that creates stunning underwater landscape
    • There are several popular styles that are used in aquascaping with Nature Aquariums being the more predominant
    • They involved aquascaping rocks, driftwood, and aquatic plants
    • They often will require CO2 injection to enhance growth

    How to Get Started?

    If you’re completely new to aquascaping, the very first thing you’ll need to do is decide on what type of critter are you looking to keep, or if this is going to be a one hundred percent horticulturist endeavor?

    And I say critter because with all the options of aquascaping available, it’s possible to keep anything from fish to small shrimp and even frogs. So the more you understand what type of aquatic creatures you’re trying to make happy, the easier it will be to try and replicate their natural habitat, or at least somewhere they’d enjoy living.

    For example, if I wanted to have a beautiful nature aquariums with small freshwater shrimp and a few tetras, I would opt for an Iwagumi style set up. Or for fish like Cichlids, I would use the Biotope Style.

    But if this is simply for your enjoyment and have no plans on keeping any specific aquatic pets, then there’s a whole world for you to consider.

    Understanding what’s going to live in your newly created natural habitat, or not, can help narrow down your focus and shorten the learning curve considerably.

    Considerations

    • What will live in the tank
    • How big is your tank
    • How much are you willing to spend
    • How much time do you have for maintenance
    • Your personal aesthetics

    What’s Next?

    Now that you have an idea of what will live in your freshwater aquarium and a taste of what’s involved, it’s time to see what style you would want to recreate in your own tank.

    This is aquascaping, simply landscaping under water in a confined space. So the best place to see what you might like is to look at some regular landscaping pictures.

    Type in something like ‘beautiful landscapes’ into your search engine and click ‘images’. You’ll be presented with thousands of images, all of them potential aquascapes for you to clone and experiment with.

    CO2 Injected Planted Tank

    Choose a few images that really inspire you, and notice what they all have in common. Are they all sprawling grass fields, or forest covered mountains?

    This is what you feel is beautiful or have some sort of connection with, and it’s also what you should be working towards in your own aquascape ideas. After all, it’s you that needs to see it everyday!

    Once you have an idea of what you connect with, explore the different styles of aquascaping to see which style most resembles your personal choices. It’ll be easier to understand one style’s complexities than trying to learn the whole hobby at one go.

    Just like in ‘real’ landscaping, there are a lot of styles of aquascaping and you just need to figure out which aquascape ideas float your boat.

    Once you narrow your focus on which style resonates with you, then you can go deeper into researching everything that goes into that particular aquascape.

    Here Are A Few Of The Main Aquarium Styles

    Nature Aquarium Styles

    Nature Style Aquarium Example

    Nature aquariums are definitely one of the most popular aquascaping ideas and was originally developed by Takashi Amano from Japan. Takashi took what he knew, and incorporated the lush high mountain peaks of Japan into his art using aquascaping rocks, mosses and other aquatic plants and hardscapes.

    His style is one in tune with nature and wanting to bring the beauty of large landscapes into a small underwater space. Everything is as natural looking as possible and well balanced for a sense of serenity when looking at one of his creations.

    Dutch Aquarium Style

    Originating in the Netherlands, Dutch aquascaping is characterized as vibrant and full of color and variety. This planted aquarium style focuses on aquatic plants rather than other materials.

    Dutch Aquascape

    More of an underwater flower garden, Dutch aquarium aquascapes contain patches of a wide variety of plant species that are arranged neat rows and patterns. The densely planted aquariums are well manicured and are reminiscent of the old traditional gardens of the Netherlands.

    Iwagumi Style

    The Iwagumi aquascape originated with the same man who started the Nature Aquarium style, Takashi Amano. Only this time, he went for a super minimalist appearance creating sprawling low landscapes that bring the eye to a few key focal points, usually strategically placed stones all having their own importance in the overall balance of the Iwagumi aquascape.

    Short aquatic mosses help create a sense of grandeur of the jutting rocks while giving the Iwagumi aquascape a life form all its own.

    Biotope Style

    Biotope aquascapes are great when you have a certain species of aquarium fish you want to keep and pamper as best you can. The aquascapes are literal miniature ecologically correct environments that replicate the fish’s natural habit down to the last detail.

    These can include what you’d naturally find in rivers, swamps, or other aquatic terrains. Done right, your aquarium fish should never realize they are in a fish tank and not in their natural habitat.

    Paludarium Style

    One of the more difficult aquascaping styles to pull off, these aquascaping ideas require three key components; water, land, and a canopy portion. That means your tank will never be completely filled with water which is perfect if you want to keep a small frog or two. You can see a world class Paludarium below from Green Aqua’s YouTube channel.

    They include terrestrial plants and aquatic plants, making them a true biozone. And although they may be a bit more complicated, they do open up the possibilities when it comes to what you can keep in your tanks.

    Setting Up Your Tank

    When it comes to your aquarium, you really want to go with the largest freshwater aquarium you can afford or fit in your space. A twenty gallon fish tank and a few plants is a great start, but a hundred gallons is even better. Only go with small aquariums if you’re working with a really tight budget.

    You’ll also want to use a rimless tank that doesn’t have any braces or other materials that take away from your aquascape. You want a tank that is pure glass and a solid stand.

    As far as a stand, it’s a good idea to get a cabinet type. You’ll need a few tools and possibly a CO2 tank for your aquascape, and it makes it easier to hide all your equipment so everything looks as clean and professional as possible.

    Personally, I like a very dark colored cabinet stand so when the aquascaping lights are on, you don’t even notice what’s underneath the aquarium.

    Substrates

    Substrates are extremely important in a planted tank due to all of the live plants you’ll be working with. It’s needs to be both fertile enough to sustain your aquatic plants, and hardy enough for the plants to root in and support rooting plant growth.

    If you’re only working with carpeting plants like mosses, then your plant substrate isn’t as important. But even small plants need something to grow in.

    And just like the live plants that grow in your yard, many aquatic plants pull nutrients from the soil using their roots. That means your plant substrate will need to include these nutrients and possibly be easy enough to change or add more when they’re depleted.

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    Walstad Method

    The best method for achieving a well balanced planted tank is the Walstad Method.

    This method of growing aquatic plants in aquascapes is named after the woman named Diana Walstad who literally wrote the book on it, (see: ‘ECOLOGY of the PLANTED AQUARIUM – A Practical Manual and Scientific Treatise for the Home Aquarist’).

    When done correctly, this method provides all the nutrients your aquatic plants will need and you won’t need to change the soil or add any additional nutrients. You can see an example of this setup from Ceyhun Derindere Aquatics’ YouTube Channel.

    This is because the plants will quickly create a chemically balanced biological ecosystem within your tank and break down any fish refuse to be used by your plants as fertilizer.

    Once established, you shouldn’t even need to use a filtration system for your tank as the plant life and biological ecosystem created naturally does all the work for you.

    All you need to do is get some quality potting soil that you can find at any garden center. Just make sure there are no added chemical fertilizers!

    Add at least one inch of the soil in the bottom of your tank. Then add a thin layer of sand, or 2 inches of medium fine gravel so the soil can always breathe. That’s it!

    The only thing you need to be aware of is you must give your fish tank a minimum of two months to stabilize and be ready for your fish.

    Sand and Gravel

    Both sand and gravel make great substrates depending on the aquascaping plants you’re growing. Both come in all sorts of sizes and colors and are easy enough to source.

    Just be sure that your aquatic plants match they type and size you’re looking to use. Tall plants find it hard to root in small particle sized sand whereas mosses will have problems rooting in large gravel substrates.

    And also take your fish into account. Don’t use substrates with sharp edges if you’re going to include catfish or other bottom dwellers.

    Hardscape Materials

    Hardscape materials will either make or break your entire design. Everything about them is important, their size, color, material, everything. After all, these are the focal points of your aquascape and should be added after you’ve finished adding your substrate.

    Rocks

    Although you may think rocks are pretty boring, there are actually a massive amount of different kinds of rocks. And each one you place in your tank will have an effect on the overall experience of your aquascape. So take your time finding that perfect aquascaping rock!

    Editor’s Choice!
    Ohko Dragon Stone

    Editor’s Choice

    Ohko is the premier aquascaping rock today. Granite based with amazing shapes and selection

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    Obviously what look you’re going for will determine a lot as far as choosing your rocks. For a Nature Aquascape you’ll usually want dark colored rocks with interesting designs that can look like mountain peaks or far away mountains.

    If you’ll be adding rocks to a Dutch style tank, then you should be looking for colors that play off the types of plants you’ll be using. Or sizes that won’t overpower the rest of the scene.

    Some great rock types to start with are Dragon stone, Lava rock, Ryuoh or Seiryu, Ohko and Elephant Skin rocks are all used in aquascaping.

    Which one you choose to use is going to depend on how you want your finished aquascaping design to look.

    Driftwood

    I absolutely love the look of ragged, aged driftwood in a tank. Driftwood has so much character, and the colors are perfect for a natural tank. But you can use other types of wood like petrified woods,

    Best used in Nature, Biotope and Paludarium Styles of aquascaping, driftwood can be used as a central focal point or for layering to bring depth of field to a scene.

    Editor’s Choice
    Manzanita Driftwood

    Editor’s Choice

    Manzanita offers it all. Great shape, low tannins, quick to water log and reasonably priced. It’s the ultimate driftwood!

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    Coupled with plants like Java Moss or Anubias Barteri, your wood becomes a living organism that looks amazing with a few freshwater invertebrates grazing on them.

    Filtration

    Great filtration is a must for any aquarium, and even more so when you include soil, wood and plant life into the mix. Rotting plant material decomposes over time and add a lot of different elements to your water that must be filtrated out.

    And that’s not to mention the addition of fish to your tank. Even small fish species produce waste that needs to be filtered out in order to keep your water well balanced.

    The best and most natural way of handling all this when you can is to use the Walstad Method I described above. Then instead of waste, you have fertilizer.

    But if that isn’t possible, then you’ll need to think about the best sort of filtration system yo use for your specific aquascape. Usually, some sort of external hang-on back (HOB) filter or canister filter.

    Canister filters are the best you can get. They can be hidden underneath your tank, and you can use almost any type of filtration medium you can find. They come in all sizes and can handle even the biggest water volume. The only problem is they’re also the most expensive type of filter system.

    A less expensive type is the HOB filter. These filters simply hang on the back of your tank and are simple in terms of how they’re used. So they can be a solid starting point for a new aquarist.

    But they also have many drawbacks. The first being that they hand on your tank. For aquascaping, this is definitely not ideal. Furthermore these filters can’t hold nearly the amount of filtration media that canisters can, nor are they as quit when running.

    They are also not meant for larger tanks as they aren’t all that powerful.

    So if you have the funds, I highly suggest just going for the canister filtration system.

    Lighting

    Since aquascaping relies heavily on plants to complete their overall scene, having the correct lighting for plants to photosynthesize and fish to thrive is going to matter a lot.

    Unlike other types of aquarium lighting, we are looking for lighting options that are specifically designed for growing aquatic plants. This is one area where the needs of your fish take a back seat.

    In a traditional aquarium set up, fluorescent light bulbs would be fine for most plants and fish. But they aren’t well suited for aquascaping plants and should be your last choice.

    The very best lights for your aquascapes would be bulbs that mimic natural daylight. And they need to be strong enough to reach the depths of your tank while not creating a lot of heat and effecting the water temperature.

    LEDs are the perfect choice for aquascaping. They can do all of that and more. In fact, you can do all sorts of cool things with LED. They can be easily timed when they come on and off.

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    You can dim your lighting, or even dim or brighten certain areas of your tank all with the same light source. You can even add different colors or light spectrums to the mix.

    There really isn’t much you can’t do with LEDs today. And they are much more energy efficient than other types of grow lights. So over time they can end up saving you money.

    Plants

    Obviously, plants are going to play a major role in any aquascape. Your plant choices will ultimately depend on the overall aesthetic you’ve chosen and the type of aquascape style you want to achieve.

    You’ll also need to take into consideration the individual requirements of each plant. It’s best if you have similar species of plants that require the same lighting, temperatures and water hardness so it’s easier to maintain your tank. And slower growing plants will need less pruning.

    There are actually four groups of plants you need to consider when planning your aquascape based on their size and where they will be placed in your setup. The idea is to vary the heights of your plants to give your tank an overall feeling of depth to the scene.

    Background . Background plants will usually be the largest plants in your aquarium. The ones I’ve listed here are the easiest to source and grow to about 12 inches (30 cm) or more. They do come in a variety of leaf shapes and sizes, but the only color variations are greens and reds.

    Midground . Your Midground plants are next. They only grow to a medium height of about six inches tall and should be used somewhere in the middle of your tank in front of your background plants.

    • Java fern
    • Anubias species
    • Cryptocoryne species
    • Alternanthera reineckii
    • Red dwarf Hygrophila
    • Blyxa short leaf. Blyxa novoguineensis
    • Chain Sword
    • Dwarf Cardinal plant. Lobelia cardinalis
    • Downoi. Pogostemon helferi
    • Basil Leaf. Limnophila rugosa
    • Water Hyssop. Bacopa caroliniana

    Foreground . The area closest to you as your viewing your tank, most aquascaped foregrounds will include some of your smallest plants so you have a clear vision of the entire scene.

    Some species are also called carpeting plants, and many types of mosses are incorporated here giving your aquascape a lawn effect, or rolling hills like in the Iwagumi style of aquascaping.

    • Staurogyne repens (S. repens)
    • anubias nana petite
    • dwarf hairgrass (Eleocharis acicularis)
    • Micro sword (Lilaeopsis brasiliensis)
    • dwarf chain sword or pygmy chain sword (Helanthium tenellum)
    • Hydrocotyle tripartite

    Carpeting Plants

    • Dwarf baby tears (Hemianthus callitrichoides ‘Cuba’)
    • Monte carlo (Micranthemum tweediei)
    • Mini pennywort (Hydrocotyle tripartita “Mini”)
    • Creeping Staurogyne (Staurogyne repens)
    • Vietnam Ambulia (Limnophila sp. “Vietnam” )

    Floating Floating plants are helpful in low to medium light conditions as they can provide cover and can be arranged in ways to shed shade on the areas of your tank that need less light.

    And since these types of plants do not grow in the substrate, they can be added or taken away easily. Plus, the species with roots can add a lot of drama to the overall feel of an aquascape as the plant roots hand down into the scene.

    • Duckweed (Lemna minor)
    • Hornwort (Ceratophyllum demersum)
    • Amazon Frogbit (Limnobium laevigatum)
    • Dwarf Water Lettuce (Pistia stratiotes)
    • Water Spangles (Salvinia minima)
    • Mosquito Fern (Azolla filiculoides)
    • Pennywort (Centella asiatica)

    Fish Species

    Your fish should be the last thing that’s added to your aquarium. Your aquascape will need some time to take hold and after you first finish, you will probably want to make some adjustments which means arranging aquatic plants which your fish won’t take kindly to.

    And it also takes some time for the water to become more stable and establish a healthy ecosystem. This can take as long as two months, so be patient.

    Give your aquascape the chance to cycle through and the plants to take root. then when you introduce your fish, they’ll feel right at home with no disturbances.

    As far as which fish to keep, remember, the aquascape is the focus, not the fish. They are just the decoration. So you want fewer and smaller fish than you would otherwise.

    This also helps to give the aquascape more of a sense of largeness or openness. A big fish would just look really out of place!

    Just try to match your fishes requirements with that of your plants. If all of your plants need strong light or warm water, make sure the plant safe fish you include can tolerate these same conditions.

    Small schooling fish like Neon Tetras are perfect for these types of tanks since they are easy to care for, don’t pull up plants and can live in all types of freshwater aquariums.

    These fish only grow to an inch and a half and are inexpensive and easy to source. There are many different tetras and any of these colorful fish would do well in an aquascaped environment.

    Harlequin Rasboras are another great choice reaching less than an inch and a half full grown, they are easy to source and are very inexpensive. They’re easy to keep, school well in groups and don’t disturb your plants. Overall a great choice.

    Celestial Pearl Danios, or Galaxy Rasboras are beautifully colored fish and work well in Natural or Iwagumi tanks where there isn’t much color. These easy to care for fish are still a bit rare and much more expensive than the Tetras or Rasboras, but they are worth the cost.

    The best part is these fish naturally live in heavily planted ponds and grow to less than two inches, so an aquascaped tank would be the best option to keep these fish healthy and happy.

    The Spotted Blue-eye is another easy choice. Colorful and timid, this fish’s natural habitat is heavily planted shallow pools. They rarely grow to over an inch and a half and add some pizazz to any planted tank.

    The Neon Blue Tux Guppy  (Poecilia reticulata) is another peaceful fish that looks great in aquascapes. You should keep at least six as they like to school, and you can keep up to 20 or 30 if your tank is large enough. This brilliant blue tailed fish grows to be about around 1.5 inches and is easy to manage and find at most fish stores.

    Another fish you should include is a Otocinclus Catfish. These are small busy fish and should be kept in groups of three or more. These guys will help you keep your tank clean by eating most forms of algae which is always a bit of a problem when it comes to heavily planted tanks. If you have a larger aquarium, keep five to ten to help out with your tank maintenance.

    Shrimp are another great way to combat algae growth and are very interesting to watch and even breed. Neocaridina Shrimp are probably the best ones to start off with. They are stunningly colored and come in reds, blues, yellows, and greens.

    They’re also easy to find and care for and if your tank is properly maintained, they’ll breed with no problems.

    You can also try Caridina multidentata, or ‘Amano Shrimp‘ respectfully named after Takashi Amano after he made these crustaceans ‘famous’ using them as a way to keep down algae in his creations, especially in his Iwagumi Style aquascapes.

    These little translucent shrimp will eat almost any type of algae and are cheap and easy to find at most pet shops.

    Maintenance

    Since you’re primarily keeping an underwater garden, it’s smart to focus on your aquatic plants as much as possible since your plants will end up helping you maintain you aquarium once they’re established and happy. Yes, plants can be happy too!

    The perfect aquascape should rely on the miniature ecological environment in the tank to take care of most issues. Your plants should be absorbing the carbon dioxide from your fish, and the fish should be breathing the oxygen from the plants.

    Any fish waste should be fertilizer for the aquatic plants and food for your catfish and shrimp.

    Think of how nature works and that’s what you should be trying to replicate inside your aquarium. The closer you get, the less maintenance you’ll need to do.

    Daily Tasks

    Do daily inspections of your plants, fish and anything living in the tank. notice if your fish are loosing their colors, or seem lethargic.

    See that your plants are steadily growing and there are no brown spots or dying leaves.

    Check for algae growth and ensure your filters and lights are all working correctly.

    Water changes are the most important thing you can do to keep your aquascapes pristine. And it’s far better to do a 10% or 20% daily water change that a 50% change once a week.

    If you’re unable to stick to a regime like this, do the best you can. Even every other day or every two days is better than weekly changes. Just be sure the water you’re adding is close to the same temperature of your tank’s water so as not to shock your pets inside.

    Weekly Tasks

    Clean the aquarium glass inside and outside the aquarium. Even if it looks clean, small algae spores may begin to collect and it’s best to never give them a foot hold on your tank.

    Check your plants and trim any ones that are not growing the way you want. Really look at them and be sure their leaves are clean and smooth and nothing is eating them.

    You may need to vacuum your substrate if possible from time to time. But you need to be very careful as not to bring up any soil under the substrate if you’re using the Walstad method for your aquatic plants.

    Test you water’s pH range and carbon dioxide levels to make sure your plants and fish are happy and safe.

    And if you haven’t done daily water changes, you must do at least weekly changes or you’ll run into problems! If done weekly, you need to do at least a 50% change. Just make sure the water temperature stays stable when making such a large change.

    Wrapping Up!

    Getting started aquascaping is as easy or complex as you want it to be. And the diversity of the hobby is enough for anyone to keep busy for a life time. All you need is a bit of imagination, a few bucks and an aquarium. After that, the rest is up to you.


    🌿 Want to learn more? This article is part of our complete Planted Tank & Aquascaping Guide. your ultimate resource for aquarium plants, aquascaping styles, substrates, and more.

  • How to Lower Nitrates in a Fish Tank: 9 Methods That Actually Work

    How to Lower Nitrates in a Fish Tank: 9 Methods That Actually Work

    Nitrate management is something I think about constantly across my tanks. especially my 125-gallon reef where elevated nitrates directly impact coral health. Over 25 years I’ve tried every method out there, from water changes to refugiums to carbon dosing. Here’s what actually works and what’s most practical for most setups.

    Nitrates don’t kill fish overnight the way nitrites do. and that’s exactly what makes them dangerous. In my 125-gallon reef tank, I learned to respect nitrates the hard way. Coral bleaching, nuisance algae outbreaks, and sluggish fish behavior were all signs I initially attributed to other causes. Once I dialed in my nitrate management through a combination of water changes, refugium macroalgae, and a biopellet reactor, everything improved. In freshwater tanks, the fix is often simpler, but the principle is the same: elevated nitrates stress fish chronically, suppress immune systems, and fuel algae blooms. Here’s what actually works, based on my experience across dozens of setups over 25 years.

    Expert Take (Mark Valderrama, AquariumStoreDepot)

    High nitrates are almost always a symptom of one of three things: overstocking, underfiltering, or infrequent water changes. After 25 years, I’ve seen plenty of people chase nitrates with filter media and additives when the real answer is simpler. A test kit tells you you have high nitrates. The question is why. Fix the root cause first, then maintain with consistent water changes and live plants. Anything else is treating a symptom.

    Key Takeaways

    • Nitrates are the least toxic compared to Ammonia and Nitrite
    • At high levels, nitrate is harmful to your fish
    • Water changes, live plants, and specific media can help lower nitrates

    What Is It?

    Nitrate is a component of the nitrogen cycle and it is formed when bacteria do the conversion of ammonia. The bacteria named, Nitrosomonas1 first convert ammonia into nitrite and then it converts nitrite into nitrate.

    The names, nitrate, and nitrite are similar and beginner aquarists usually confuse them. However, nitrite is very toxic to the fish, while nitrates are less toxic. That’s because most aquarium fish may be poisoned and killed by nitrite concentrations of just 1 part per million, whereas nitrate concentrations can occasionally be 100 times higher. Some people associate high nitrate levels with bothersome algae and Old Tank Syndrome, which causes nitrate levels to rise, pH levels to fall, and any newly introduced fish to be stunned and die despite ammonia and nitrite tests coming back negative.

    The fun part about nitrate is it’s present almost everywhere. You might just be replacing your old tank water with new tap water and there are high chances of nitrate being present. Fortunately, it’s not as deadly as nitrite.

    How To Lower Nitrates In Fish Tank

    Quick Answer

    The fastest method: a 25 to 30 percent partial water change, repeated every 2 to 3 days until nitrates drop below 20 ppm. Long-term solutions include reducing stocking density, increasing water change frequency, adding fast-growing live plants (hornwort, water wisteria, vallisneria), and using nitrate-absorbing filter media like Seachem Purigen. Target: under 20 ppm for freshwater, under 5 ppm for reef tanks.

    One of the easiest ways to lower nitrates in a fish tank is by changing your tank water frequently. The other quick ways include adding live plants, removing filter media, and avoiding overfeeding and overcrowding.

    We have a video from our YouTube Channel for those who want a visual explanation. As always, our blog post goes into more detail. Feel free to look at both. If you like our channel, be such to subscribe as we post new videos every week!

    1. Frequent Water Changes

    Your nitrate level will decrease if you switch to tap water as long as it contains less nitrate than your tank water. Test the nitrate level in both your freshwater tank and your tap to check that this is the case.

    Also, remember to maintain the right temperature of the water you’re replacing and make sure it’s treated for chlorine or chloramine.

    Avoid using tap water if the nitrate levels are around 40 ppm or higher. It’s best to use RO water if the nitrate levels are too high in your tap water. The benefit of RO water to your aquarium fish is many as it removes nitrates, phosphates, chlorine, and minerals from tap water. Also, RO water is soft water with low pH, so suits the fish that prefer such water conditions.

    Summary:

    1. Perform water changes frequently.
    2. Vacuum the gravel to remove debris and fish waste
    3. Change your filter pads every once or twice a week to remove uneaten food rots or fish wastes that add to nitrate levels
    4. Make sure to test your tap water for nitrates before introducing it into the tank.

    2. Live Plants

    The old tank syndrome or high nitrate accumulation in your tank is very common. If you have freshwater aquariums, the problem seems quite under control. However, in saltwater tanks, extreme nitrate levels can cause a nuisance. It is said to lower nitrates and keep them below 20 mg/L for a healthy ecosystem.

    To cater to this, a planted aquarium works best to pull nitrates from the water for nutrition. However, there are some plants better than others.

    As plants might really run low on this important nutrient after using it all up, aquascapes actually inject nitrate in the form of nitrogen, or N. Other advantages of live aquatic plants for freshwater aquariums include helping to control algae growth, sheltering young fish and fry, and providing areas for fish to lay their eggs. Just make sure any aquarium with plants has the appropriate lighting and additional fertilizers to keep the plants thriving and healthy.

    Aquarium Plants That Work Best

    Water Sprite

    Water sprite or Indian Water Fern is a good live plant for most community tanks. They are also very useful, low-maintenance, and beautiful plants that keep your aquarium nitrate, ammonia, and nitrite free.

    Water Sprite

    Readily available and easy to grow. This fast growing plant will soak up nutrients and thrive in low light

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    The leaves of water sprite are fast growing, so they quickly absorb all harmful toxins and chemicals from the tank water. Hence, they are powerful natural filters for your aquarium. However, they are very fast-growing plants that grow like a weed and may tangle into other plants. So, it’s important to prune them occasionally without harming the leaves.

    Duckweed

    Duckweeds are excellent floating plants that lower nitrates in your tank naturally. In the wild, you will usually find them sitting on top of the surface of many lakes and ponds.

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    Duckweed

    An easy to care for plant that Goldfish love to eat!

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    In the aquarium hobby, duckweed is known to control nutrients and add aesthetics to the fish tank. However, like water sprite the growth rate of duckweed is very high, leading to uptake nutrients, equipment clogs, and many other problems. Therefore, it’s important to trim the branches occasionally.

    Water Wisteria
    Water Wisteria

    An easy to grow and great beginner floating plant to try!

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    Water wisteria is one of my top picks for nitrate-reducing plants because it is, aesthetically pleasing with its gorgeous palmate leaves. Plus, it’s so easy to grow and low-maintenance. However, always grow this plant in the background as it turns very tall and bushy within no time.

    Frogbit

    If you have a larger aquarium tank, the frogbit plant should be your go-to. Appearance-wise, frogbit is very similar to duckweed and nitrate uptake.

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    However, the leaves are thick and circular in shape.

    Frogbit is very similar to duckweed in appearance and nitrate uptake. Your community fish can thrive and seek shelter in their long roots. But extra maintenance should be done to keep the roots and growth at bay.

    Hornwort

    A common choice for nitrate reduction in aquariums is hornwort. Aquarists wishing to lower nitrate levels in their tanks can use this rapidly growing aquatic plant because of its special capacity to absorb nitrates from the water column.

    As hornwort can absorb a lot of nitrates from the water column, it is a fantastic choice for aquariums with high nitrate levels. The plant is a helpful addition to any aquarium since it also lowers ammonia and phosphate levels.

    Hornwort may drastically reduce nitrates in as little as two weeks, but it’s crucial to keep in mind that it should be used in conjunction with nitrate-reducing systems. The aquarium must be regularly checked for nitrate levels in order to remain healthy and free of them.

    Anacharis

    Anacharis not only create nitrate remover but they also recognize to be a fantastic food source for many varieties of freshwater fish, including goldfish, tetras, and guppies. It also makes a terrific plant for breeding tanks because of its long, thin leaves, which offer excellent hiding places for fry.

    Water Lettuce

    One other live plant species that may remove nitrates from the tank water is water lettuce. A shallow-water pond’s nitrogen content may be effectively extracted by species like pistia stratiotes to the extent of 83%. You should plant this floating plant if you want both aesthetics and functionality.

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    3. Nitrate Reducing Media 

    To remove nitrates, nitrate removal filter media is used to lower nitrates in fish tanks. As mentioned earlier, nitrates are the natural by-product of the nitrogen cycle. The process allows beneficial bacteria to convert fish waste and uneaten food into less harmful substances.

    In order to remove nitrates, many aquarists equip the filer with high-performance filter media, such as the Biome Ultimate Filter Media, which is highly porous with a unique structure that absorbs water seamlessly. Filter media works in an exclusive way and supports beneficial bacterial bloom that is good at removing nitrate levels. 

    However, there are a few pointers you have before using nitrate-removing filter media in your tank.

    Filter media type

    It is important to choose the right type of filter media that suits your aquarium size and filtration system. There is a variety of nitrate-removing filter media in the market, including resins, pellets, sponges, sintered glass, etc. Biome Ultimate Filter Media is made of premium quality sintered glass and is ideal for Canister, HOB, and sump filters.

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    Preparation of filter media

    It is crucial to rinse the media to remove any dust particles and debris. While rinsing the media, always use fresh water and avoid the use of soap or detergents, as they can potentially harm the beneficial bacteria in the media. 

    Placement 

    Whether the media should be placed in the filter compartment or inside the filter bag, place it in the filter and make sure to follow the instructions on the label correctly.

    Keep An Eye On Your Levels

    I recommend using a water testing kit to monitor the nitrate levels in your aquarium. After adding filter media, it should take around 2 weeks to notice a significant decrease in nitrate levels.

    Replace The media

    Over time, media might become dirty and saturated and will need to be routinely changed. For information on when to change the media, consult the manufacturer.

    4. Equipment Methods

    Reverse osmosis, water distillation, and ion exchange methods can remove nitrate levels from water. However, remember that it’s not easy to get rid of nitrate levels through sediment filters, carbon filters, or even traditional ion exchange water softeners. To get rid of nitrates effectively, it’s important to install an anion resin tank. Also, if you want to reduce nitrate levels in your tap water, it’s crucial to install an under-sink RO system. If you have a small fish tank, it’s recommended to use a water distiller to reduce nitrate from the water. 

    Reverse Osmosis Method

    To use the reverse osmosis method, you have to install an RO unit that is specifically designed for aquariums. The RO unit is usually connected to the source of tap water. The water is then transferred through the system which removes toxic nitrate, and other contaminants.

    After the removal of all the nitrate, the pure water is collected in a tank that could later be used for aquarium water changes and regular maintenance by topping off the tank.

    Important

    The reverse osmosis process does not guarantee proper water quality. It is even proven to remove essential nutrients and other beneficial minerals from the water along with nitrate removal. Therefore, it is important to re-mineralize the water to maintain a healthy environment for your fish.

    Also, the RO water system demands regular maintenance to prevent the growth of bacteria and other microorganisms in the fish tank.

    Ion Exchange Method

    Though not commonly used, the ion exchange method effectively removes nitrate from the fish tank. 

    In this method, you pass the water through a resin bed with charged particles; ions. These ions in the resin bed attract the oppositely charged particles in water, including nitrates. Hence, the resin becomes saturated with nitrates and other contaminants. It’s best to regenerate or replace the resin bed to effectively remove nitrates from the water in the future. 

    Water Distillation Method

    If you want to remove nitrate, dissolved solids, minerals, and other toxic substances from water, you should go for the water distillation method.

    In this method, the water is boiled until steam is produced. The steam is later cooled and condensed into liquid form. While the water is boiling, it removes nitrates and other toxic substances. As a result, you get pure distilled water free of nitrates and other dissolved solids.

    5. Algae Turf Scrubber (ATS)

    Caution: If you have a planted aquarium, DON’T try this method!

    The Algae turf scrubber method is ideal for freshwater aquariums or saltwater tanks through a process called biological filtration. 

    In this method, the ATS device used light and nutrient-rich water flow to encourage bacterial growth, which absorbs nutrients, such as nitrates from the fish tank. ultimately removing them from the core.

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    To speed up the process and effectiveness of ATS, it’s crucial to provide adequate lighting and nutrient-rich water flow for smooth algae bloom. It’s also advisable to clean your algae mats and screens to prevent clogging. 

    6. Refugium Sumps (Saltwater)

    Refugium sumps are a natural form of biological filtration that effectively reduces nitrates in the tank. They are ideal for a saltwater tank.

    In an aquarium system, a refugium sump is a separate compartment that is often stocked with living plants, algae, and other microorganisms. Nitrates and other dissolved nutrients are absorbed by living plants and microbes when water passes through the refugium, changing them into less hazardous forms. The primary aquarium is then filled with purified water.

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    You would normally require a sump tank, a water pump, and suitable lighting for the living plants and algae to set up a refugium sump for nitrate removal. To avoid overgrowth and to guarantee adequate nitrogen intake, the living plants and algae in the refugium would need to be routinely clipped and removed.

    7. Live Rock and Porous Rock (Saltwater)

    Live rock and porous rocks are the types of rocks, which are directly harvested from the ocean. These types of rocks have living organic matter such as bacteria, algae, and invertebrates to break down organic waste, such as nitrates. When the water in your aquarium flows through these rocks, the bacteria in them convert nitrates into nitrogen gas, which is less harmful. 

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    However, the process of biological filtration through these rocks is slow and may be insufficient, depending on the tank size. To use live rock and porous rock as natural filters, just add the rock to your fish tank and let it establish a biological system. 

    Pros

    1. Source of natural biological filtration
    2. Provide a natural aesthetic to the aquarium
    3. Require little to no maintenance

    Cons

    1. They can be costly
    2. Can be contaminated
    3. Takes time to establish a biological filtration system
    4. May not be effective for heavily planted aquariums or stocked aquarium

    8. Feed Less

    Feeding less is one of the most significant ways to lower nitrates in your tank. Also, it’s important to set a feeding routine for your fish. During the feeding time, make sure to shut off all the filters and pumps. Add a smaller amount of food and let the fish consume it all. Feed your fish for no more than 5 minutes. Otherwise, there will be leftover food trapped in filters, leading to higher nitrate levels.

    Key Takeaways:

    1. Always feed smaller amounts of food because overfeeding can lead to increased nitrate levels
    2. Feed only twice or thrice daily to prevent excess waste 
    3. Use high-quality food with fewer fillers and more nutrients for better digestion

    9. Avoid Overcrowding 

    Any aquarium’s nitrate level should directly correspond to how much ammonia the fish produce. Nitrate production increases with the number of fish present. The more fish you have, the more nitrate they will produce. As a result, tanks are frequently overstocked with too many fish and overfed in tanks with persistent nitrate issues. You may reduce the amount of ammonia, fish waste, and subsequent nitrate created by keeping fewer, smaller fish without overfeeding them.

    To avoid overcrowding your tank, start out with one small fish per 10 gallons of water. Later, add two or three fish weeks apart and test the nitrate levels in your tank. As soon as the nitrate levels start to rise, stop adding fish to your tank.

    FAQs

    What is the fastest way to lower them?

    The fastest and easiest way to lower nitrates in your aquarium is by performing partial water changes by removing a portion of tank water and replacing it with fresh, clean water. 

    How do I lower them in my fish tank naturally?

    Fortunately, we have some excellent natural filters in the form of live plants. Live plants absorb nitrates and other nutrients from the tank and promote a healthy natural ecosystem

    What can I put in my tank to lower them?

    You can put nitrate-removing filter media in your filter to lower nitrates in your tank. Additionally, you can also use live and porous rocks if you have saltwater tanks.

    Why are my levels so high?

    There can be several factors associated with high nitrate levels in your fish tank. They can be:

    Too many fish
    Overfeeding
    Improper filtration
    Dead fish or dead plants (decomposing plant matter)
    Tap water high in nitrates

    How do you fix high levels in a fish tank?

    You can fix and avoid the high nitrate levels in your fish tank by testing the water regularly. Also, regular water changes and maintenance is the key to keeping your tank ammonia and nitrite free.

    Can fish survive high levels?

    Yes, but only for a short period of time. Overexposure to high nitrate levels can result in reduced oxygen levels, increased stress, and health-related problems.

    How long does it take for levels to go down in the aquarium?

    It depends on the nitrate levels, the efficiency of the filter system used, the tank size, the water changes schedule, etc. Generally, you will notice a considerable difference in nitrate levels just after a water change. However, if the levels are too high, it may take multiple water changes to reach a safe level. 

    Final Thoughts

    High levels of nitrates can affect the health of your fish and the overall aquarium ecosystem adversely. Therefore, it is important to monitor the nitrate levels through regular maintenance and water testing. It’s also crucial to add live plants in your aquarium to keep the fish healthy, happy, and thriving. Lastly, make sure to never overfeed your fish and overcrowd your tank as it may cause a nitrate spike, leading to severe stress and other health problems. 

    References

  • 8 Signs a Fish Is Dying (And What to Do Before It’s Too Late)

    8 Signs a Fish Is Dying (And What to Do Before It’s Too Late)

    After 25+ years in this hobby, I’ve lost more fish than I care to admit. and the honest truth is that most of those early losses happened because I didn’t know what to look for. Fish that died slowly almost always showed warning signs first. I just wasn’t trained to recognize them yet.

    Catching these symptoms early is the difference between saving a fish and losing it. Some of the signs below are obvious, but a few are subtle enough that experienced keepers still miss them. Here’s what to watch for. and what to do when you spot it.

    Key Takeaways

    • Losing a fish is hard, but it’s important to know what to do when that time comes.
    • There are many symptoms of a dying fish, including abnormal swimming patterns, differences in physical appearance, and trouble breathing.
    • Sick and dying fish are often the result of incorrect water parameters, extreme water temperature, stress, or injury. However, they may also die from old age.

    Is Your Fish Dying?

    If you ask this question, it’s likely too late to save your fish. A healthy fish is colorful, active, and eager to eat. A dying fish might have some obvious external symptoms like cut-up fins, abrasions, inflamed gills, or other signs of parasites. You can check out our video below on our YouTube channel. Subscribe if you like our content and follow along with our blog below. Our blog is more detailed than our video.

    Some behavioral changes might include erratic swimming around the tank, laying sideways on the substrate, gasping for air at the water’s surface, or scratching against hard surfaces. Sick fish may also lose weight from a poor appetite and turn pale in body color.

    Neolamprologus similis fish

    Many of these symptoms overlap with symptoms regularly displayed due to disease and illness. For example, common parasitic infections, like ich, cause the fish to scratch themselves against surfaces in the aquarium and gasp for air. Even though the fish may show these symptoms and look physically damaged, they can still be saved through relatively straightforward treatment methods.

    How do you know that your fish is past the point of being saved, though?

    This is a hard call to make, but it’s easy to know when your fish is on its final days either due to disease or age. That isn’t to say that you shouldn’t keep trying to save your fish until that day comes, though. But at some point, there is nothing you can do.

    Usually, there will be major changes in behavior and appearance. Some of the more foretelling symptoms of imminent death include:

    • staying out in the open once the fish tank lights have gone out
    • staying hidden in rockwork and decorations during the day
    • pale and tattered appearance
    • getting stuck in intake flows
    • getting picked on by other fish and invertebrates

    How To Tell Your Fish Is Dead

    It can be hard to tell when your fish is dead for certain. When they’re dying, it is common for fish to lay on the substrate motionless. Their breathing can be fast and shallow or slow and deep.

    A dead fish will be completely motionless. They may have stiff fins. They may have sunken-in and cloudy eyes. Their body may have started to deteriorate. If you have invertebrates in the tank, they may have even started to break down the body.

    If you’re unsure about whether or not your fish is dead, try to remove it with a fish net. If your fish is dead, then it will most likely be stiff and won’t put up a fight. If your fish is dying, it may be flexible and try to evade being caught.

    Do Fish Float or Sink When They Die?

    You’ve probably seen the cartoon of the dead fish floating upside with crosses over its eyes. Its tongue might have even been sticking out.

    No, this is not what happens!

    When your fish die, generally, they sink. Oftentimes you’ll turn on your aquarium light to find your sick fish nowhere in sight. Once you start checking between rocks and decorations, you’ll often find the dead fish laying on its side on the substrate. If you have invertebrates in the tank, it’s possible that they will have started to eat the fish.

    It is strongly recommended to remove the dead fish as soon as possible to prevent problems with water quality.

    Signs That A Fish Is Dying, Dead, Or Sick

    So what signs should you look out for in your fish? We’ve listed some of the less common symptoms of a dying, dead, or sick fish, but we haven’t listed the ones you’re most likely to see.

    Remember, these can result from a disease or illness and do not always indicate imminent death.

    Swimming Sideways Or Upside Down

    Swimming sideways or upside down is a very worrying symptom. This behavior can display itself in several ways.

    One, your fish may literally be swimming upside down or sideways. This is usually indicative of poor water quality but is also one of the leading symptoms of both swim bladder disease and fin rot (video source).

    Another way this symptom presents itself is your fish rapidly swimming up and down or side to side across the aquarium. This motion can be so fast that they look like they’re swimming upside down or sideways and can even lead to the fish jumping out of the aquarium.

    White Spots On Body

    A healthy fish has bright colors without any discoloration. A fish with white spots on its body is most likely suffering from parasitic, bacterial, or fungal infections. The leading cause for white spots to appear on a sick fish is ich, also known as white spot disease. However, velvet and various flukes can also present as this symptom.

    Loss Of Appetite

    Loss of appetite is seen in nearly all sick fish. However, as long as your fish eats, there is a good chance of recovery. It’s once your fish stops eating that it becomes difficult to keep them strong and bolster their immune system.

    Siamese Algae Eater

    This symptom can be difficult to treat. Hobbyists recommend soaking food in garlic to entice appetite as well as for garlic’s natural healing properties.

    Gasping For Air On The Water Surface

    Gasping for air is a sure sign your fish tank water is poor quality. This is your fish’s attempt to breathe fresh air and get away from harmful toxins. This could also mean that your fish’s gills are being affected either by parasites or bacterial infections.

    Unless your fish has a labyrinth organ, like betta fish or gourami, then it will not be able to breathe at the surface of the water.

    Betta in Fish Tank

    Swollen Or Distended Belly

    Out of all of these symptoms, a distended belly is probably the easiest to diagnose. A swollen belly can be a sign of constipation, which is easy to fix. It can also be a sign of swim bladder disease or dropsy, which are more challenging to fix but easy to diagnose.

    Gills Stop Moving

    This symptom is often paired with sick fish gasping for air at the water’s surface. The most common reasons your fish’s breathing is affected can be due to parasites and other infections.

    Breathing can also become difficult when exposed to poor water quality or other chemicals and toxins in the water.

    Redness On Body

    Redness, swelling, and inflammation of the body can be primary or secondary symptoms. Primary symptoms can be due to cuts and scrapes that your fish has received. Be mindful that redness can also indicate an infection in these areas.

    Secondary redness could be caused by parasites and related infections as well. Swelling and inflammation could even be a mix of a parasitic infection, your fish trying to scrape the parasites off its body, and infection.

    Why Is Your Fish Dying?

    Now that you can tell that your fish is dying, you need to find out why. Most fish species in the aquarium trade are hardy and can adapt to unfavorable conditions and even survive some diseases without treatment.

    Still, the most common reasons you might be dealing with a dying fish are:

    Also, consider how long you’ve had your fish. Most aquarium fish available at the pet store are at least 6 months to a year old. Tropical fish can live for surprisingly long times, with most species having the potential to live up to a decade. However, if you’ve had your fish a long time and nothing seems to be wrong with it, then your fish might be dying of old age.

    At this point, there’s nothing you can do for your fish but give it the best remaining days of its life.

    Common Causes

    Here are some of the most common reasons why your fish might be sick or dying. Keep in mind that many of these issues overlap with one another, along with the symptoms caused.

    Water Quality Issues

    There are many reasons why an otherwise healthy fish may die from water quality issues. One of the most obvious reasons for sudden fish death is adding a ton of fish to a brand-new, uncycled aquarium. This means that fish create ammonia through waste and respiration, which cannot be processed due to the absence of beneficial bacteria that make water conditions safe. As a result, the fish often succumb to ammonia or nitrite poisoning.

    Nitrogen Cycle

    Unfortunately, many new fish keeper enthusiasts make this mistake as they don’t understand the aquarium needs to go through the nitrogen cycle before adding fish. In some cases, the fish tank is cycled, but too many fish have been added at once, leading to overloading the current population of beneficial bacteria. Other times, a water conditioner isn’t used, leading to death from chlorine and chloramine.

    Even in a mature tank, water quality issues cause dead fish. Ammonia and nitrite poisoning are still very real threats for cycled aquariums if tank maintenance isn’t regular. This is especially true if leftover food and waste are left to rot at the bottom of the aquarium and if the filtration system is insufficient.

    An easy fix to water quality issues is performing a weekly or biweekly 10-25% water change. At the same time, siphon the substrate with an aquarium vacuum to remove any unprocessed waste. Regularly use an aquarium test kit to check water chemistry.

    However, one of the more challenging water parameters to keep in check is pH. This is because pH is a very sensitive parameter due to it being calculated on a logarithmic scale. Sudden changes exceeding more than a daily increase or decrease of .50 can cause a fish’s body to stop functioning correctly. This can lead to a very fast and painful death.

    Another parameter difficult to gauge is dissolved oxygen. Fish need oxygen to breathe. As they breathe, they also release carbon dioxide into the water. This is why aquarium water surface agitation and overall water circulation are so important.

    Water surface agitation helps facilitate gas exchange, meaning bringing in new oxygen and releasing used carbon dioxide. Water circulation helps carry both oxygen and carbon dioxide throughout the water column to prevent dead zones. If fish cannot breathe, then they can suffocate.

    Water surface agitation and circulation can be increased through the use of an air stone, pumps, increased filtration, or more regular tank maintenance.

    Water Temperature

    If water quality is correct, then you still need to worry about water temperature. Aquarium fish are very adaptable to both higher and lower temperatures, but sudden fluctuations and extreme temperatures can cause your fish to go into shock.

    The reality is that too high of a water temperature can cause your fish to cook, while a low temperature can cause your fish to slip into unconsciousness and eventual death. To prevent this from happening, an aquarium heater should always be used for stability for tropical fish and cold weather environments. As aquarium heaters are very prone to malfunctioning, some fishkeeper hobbyists replace their equipment yearly.

    At the very least, the temperature should be checked once a day.

    Stress

    Even if nothing is outwardly wrong with your fish’s body, it may still succumb to stress. There are many reasons why a fish could become stressed. This could be due to incorrect water parameters, incompatible tank mates, lack of space or hiding spots, or disease and illness.

    Even though fish might not die due to water parameters, they’ll still become stressed when conditions aren’t right or when they’re fluctuating. The effects of consistently low amounts of ammonia or nitrite can start to affect fish long-term, leading to early death.

    Fish compatibility is often an overlooked reason for a stressed fish. However, if your fish feels like it needs to fight for its life every day, then it can become injured or malnourished due to competition. The same is true if keeping a schooling fish that isn’t kept with enough related species.

    Keeping a big fish in a small tank can cause the fish to become stunted. This is a physical stress that can start to affect bodily functions over time. A lack of hiding spots can also make your fish feel like it needs to be in constant flight mode, which can cause stress on the body.

    Lastly, stress from having a disease can exacerbate the symptoms of the illness. This is why it’s strongly recommended to move fish to a quarantine tank that can be fully controlled with minimal lighting and other stressors.

    Injuries

    Just like you, getting injured causes extreme stress on a fish’s body. On top of that, many of the medications used to treat injuries can cause even greater stress. Oftentimes, this stress is less than what would be caused by staying untreated.

    Still, aquarium fish are very resilient and will quickly bounce back from an injury if given proper care. Fish can happily live with one eye if need be!

    Action Steps

    Now that you know why your fish is dying, how can you save them? Like any other aquarium problem, you need to treat the cause at the source. The best ways to give proper treatment to a sick fish are through water changes, medications, and lastly, euthanization.

    Water Changes

    Water changes are one of the best ways to treat water and sick fish. Even if your fish isn’t suffering from poor water quality, introducing new water through water changes can help bolster your fish’s immune system and get them on the right track to recovery.

    As mentioned before, regular tank maintenance should include weekly or biweekly 10-25% water changes. Some medications and disease treatments may require more frequent water changes, like one ich treatment method that requires daily water changes.

    Make sure that the source water being used is high-quality, meaning that there is no ammonia or nitrite with minimal nitrates.

    Medications

    Medications are readily available for almost any parasitic, bacterial, or fungal infection found in the aquarium. Medications are not always necessary for the recovery of the fish but can help aid in extreme cases. A gentle and indirect medication, like aquarium salt, can help make the recovery process smoother.

    Keep in mind that many medications are harsh on your fish’s immune system. If your fish is dying, heavy medications may ultimately cause the death of your fish. That being said, the appropriate treatment for some diseases is only through medication.

    Conclusion

    Sadly, losing fish is part of the hobby. It is pretty easy to tell when a fish is dying or not, but it can be harder to tell if they’re past the point of recovery. A few signs of a sick and dying fish are if they have trouble breathing, erratic movements, pale body color, or loss of appetite. These symptoms can be a result of incorrect water parameters, water temperature, stress, or injuries. Also, keep in mind that fish die of old age, too.

    Luckily, there are many medications available that can treat sick fish. But if you find that your fish is suffering, it may be time to humanely euthanize them.


    🐟 Want to learn more? This article is part of our complete Aquarium Care Guide. your ultimate resource for water chemistry, maintenance, feeding, disease prevention, and everything you need for a healthy tank.

    References

  • Brown Algae in Your Fish Tank: 4 Causes and 9 Ways to Get Rid of It

    Brown Algae in Your Fish Tank: 4 Causes and 9 Ways to Get Rid of It

    Brown algae is one of the first things new tank keepers panic about. and honestly, one of the least serious issues you’ll face. It looks alarming when it starts coating your substrate, glass, and decorations, but what you’re seeing is actually diatoms, not true algae. It’s extremely common in newly set up tanks as they cycle and silicate levels stabilize.

    The good news: in most cases, it resolves on its own as the tank matures. When it doesn’t, there are reliable fixes. Here are the 4 main reasons it shows up and 9 ways to clear it out for good.

    Key Takeaways

    • Brown algae (diatoms) are common in new aquariums and usually disappear on their own
    • If brown algae is a long-term problem, its cause can be managed
    • Brown algae is a common aquarium pest that thrives on high silicates, phosphates, and nitrates
    • Increasing regular tank maintenance is a good way to combat brown algae in many cases

    What Is It?

    Brown algae- also known as silicate algae or diatoms1, are single-celled algae found in fresh and saltwater all over the planet. These tiny algae use light to grow (photosynthesize) and silicate to form a protective ‘glass’ shell. Diatoms are not true brown algae, although they evolved from the same ancestor.

    Aquarists think of diatoms as a pest, but these algae are actually vital for life on earth. Like plants, they are the foundation of the food chain, which supports all living animals. These incredible life forms also provide the oxygen we breathe. In fact, diatoms in the ocean are said to produce more oxygen than all the world’s rainforests!

    So how do you identify brown algae? These algae settle on pretty much all tank surfaces, including rocks, glass, and substrate. They form a thin, rusty brown layer that is soft and easy to remove.

    Is It Bad?

    Diatoms are generally not bad for your aquarium. They often show up in new tanks after a few weeks or months and then disappear on their own. However, a slimy brown layer is not very attractive, so in that sense, they are bad.

    Despite the ‘dirty’ look, diatoms are a great food source for many aquatic animals, including algae-eating fish. Unfortunately, there are some situations where serious brown algae growth can have real negative effects on your aquarium.

    When Are Diatoms Bad?

    Sometimes diatoms do not disappear on their own, and they can be a concern in planted aquariums. Brown algae harm plants by covering their leaves and blocking their access to light.

    When plants are unhealthy, their leaves begin to decay. Decaying leaves break down and release even more phosphates and nitrates into the water, potentially making the problem even worse.

    Let’s take a look at some of the main causes of brown algae in aquariums

    Causes Of Diatoms

    Understanding the cause of any problem in your aquarium is the first step toward finding a solution. So, it’s time for a little detective work! This information is also useful to prevent brown algae in any other aquariums you put together.

    Freshwater Diatoms

    1. New Aquariums

    The most common cause of diatom growth is a water chemistry imbalance in a newly set-up aquarium. This problem usually happens in immature tanks without healthy populations of beneficial bacteria and other microorganisms.

    A covering of brown slime is a big surprise to many new fish keepers, and it’s easy to panic and start looking for complicated and expensive solutions. Rest assured, after a few weeks, other forms of algae will probably outcompete these diatoms, and you may never see them again.

    However, if the brown algae in fish tank water do not disappear on their own, or if you develop this problem in a mature aquarium, you may need to look for other causes.

    2. High Nitrates, Phosphates, and Silicates

    These three compounds are the usual cause of persistent brown algae problems in established aquariums. Let’s take a closer look at each one and how they encourage brown algae growth.

    • Nitrates

    Nitrates are the final product of the nitrogen cycle in an established aquarium. They can also be found in low concentrations in tap water and other water sources. Diatoms thrive in high nitrate environments because they use this compound as an energy source for growth.

    The best way to limit nitrate is to physically remove it from your aquarium by changing the water. However, you can also manage this nitrogen compound by limiting the amount of fish you keep or by growing aquatic plants.

    • Phosphates

    Diatoms and other algae thrive in water with high phosphate. These phosphorous compounds are another product of aquarium waste, like uneaten food and dead plant material.

    A lack of maintenance and overfeeding flake foods are major causes of high phosphate levels in aquarium water.

    • Silicates

    Brown algae (AKA silica algae) thrive in the aquarium water with high silicate levels because they use silicates to grow a protective shell.

    Silicates are salts formed by combining silicon and oxygen. They can come from water sources like tap water and hardscape materials like sand, gravel, and rocks. Silicate concentrations in tap water may vary depending on where you live.

    3. Stagnant Water

    Brown algae attach themselves very weakly or simply settle on surfaces in your aquarium. Stagnant water with no movement allows them to multiply, while flowing water keeps them suspended in the water column where they can be filtered.

    Aquariums should have healthy water flow to keep small waste particles suspended in the water column where your filter can collect them.

    4. Poor Water Quality

    Diatoms and aquarium algae tend to thrive in low water quality with high nutrient levels. Most nutrients come into your aquarium as fish food and never really leave the system.

    Sure, the fish eat the food, but they cannot absorb all of the nutrients, and whatever remains stays behind in the form of fish poop.

    Good quality filtration and beneficial bacteria turn these excess nutrients from highly toxic substances into mildly toxic substances known as nitrate. The most efficient way of removing nitrates is through regular partial water changes and growing live aquarium plants.

    Testing

    So now you know a little more about what diatoms are and what causes them, but how do you know which cause applies to your situation? The simple answer is by testing.

    A standard aquarium test kit measuring ammonia, nitrite, and nitrates is a ‘must-have’ for any fish tank. A silicate test kit is recommended for an older tank with a persistent brown algae problem.

    When To Test

    An important thing to remember about testing is that water parameters change over time. Testing once a year or once a month will not give you an accurate idea of what’s really going on with your water chemistry.

    Test your water every three days or so in a new aquarium to monitor changes in your water chemistry. You can reduce the frequency to once a week as things stabilize, but I recommend testing before and after water changes to work out a schedule with the right results.

    Once your aquarium is established and stable, you can slow down and test once a month or whenever you notice any potential problems like sick fish, algae growth, or unhealthy plants.

    How to Get Rid of Brown Algae in Fish Tank – 9 Best Ways

    Now that you know a little more about the causes of brown algae problems, let’s go ahead and learn how to get rid of brown algae in your aquarium. We have a video from our YouTube channel that you can also follow along.

    1. Give It Time

    Brown algae are usually a temporary problem, and the best course of action in many cases is to just watch and wait. The diatoms will clear up on their own in time as other algae establish themselves and the nitrogen cycle develops and matures in your tank.

    2. Clean It Up

    If your brown algae problem is not solving itself, or you really can’t stand the sight of it, you can always clean it off manually.

    Diatoms do not attach themselves firmly like some other algae species, so they are pretty easy to remove. Here’s how:

    Cleaning Aquarium Glass

    Let’s face it; no one likes dirty aquarium glass. Removing brown algae from tank walls is easy with an algae scraper or a non-scratch algae pad. Use a plastic scraper or a purpose-made algae pad to avoid scratches if you have an acrylic aquarium.

    Whatever you use to clean your aquarium glass, take care to never get sand or gravel between the glass and the cleaner because that’s how scratches happen.

    Cleaning Aquarium Ornaments

    You can carefully remove aquarium ornaments and clean them in old tank water, ideally when doing a water change. This is not necessary if your brown algae problem has just started in a new tank.

    Cleaning Aquarium Substrate

    Brown algae often settles on the bottom of fish tanks, and this can be pretty unsightly, especially if you have a light-colored substrate. These diatoms can be removed by suction with your gravel vacuum.

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    Cleaning Aquarium Plants

    Cleaning brown algae on aquatic plants is difficult without damaging their leaves. This job is best left to the experts- the algae eaters!

    Keep reading to learn more about aquarium algae eaters later in this article or check out my in-depth guide to the best algae eaters for freshwater tanks.

    Cleaning Fake Plants

    Many aquarium owners prefer to use fake plants to create a more natural appearance, although cleaning them can be a challenge. You can scrub your plastic plants with a soft brush or cloth or dip them in a mild bleach solution (1/10 parts) or hydrogen peroxide.

    3. Change Your Substrate

    Brown algae require silicates to grow, but where do they get this material? While it is possible to reduce your silicate levels through filtration, sometimes you need to go straight to the source. Silicates can come in through your water, but they are also found in most substrates. Play sand, for example, is high in silicates.

    4. Increase Water Flow

    Increasing the water flow in your aquarium can prevent diatoms from settling. You can do this by installing a larger filter or a powerhead. In some cases, just rearranging your hardscape or moving your filter will have a big effect on water circulation.

    Of course, some fish don’t do well in strong water flow so this might not be an option with slow-swimming fish like bettas and fancy goldfish.

    5. Improve Water Quality

    Poor water quality is the cause of so many problems in the aquarium hobby that it’s usually the first place to start when anything goes wrong. But how do you improve water quality?

    Filtration

    All aquariums need adequate filtration to support the nitrogen cycle and remove waste particles from the water. There are many types of aquarium filters on the market, but it’s always a good idea to buy the best quality unit that you can afford.

    Designs like canister filters that provide more space for filter media can support larger beneficial bacteria colonies and ensure better filtration. Still, you can also use more than one filter in your aquarium as long as you do not create too much flow.

    Aquarium filters are usually rated by the tank size they can be used for, but manufacturers often overestimate this figure.

    Therefore, the filter’s gallon-per-hour rating is far more useful. As a general guideline, choose a filter that can process the total amount of water in your tank 4 to 6 times every hour.

    Adding a protein skimmer to your saltwater aquarium can improve the filtration by removing even more phosphates from the water.

    Maintenance

    The number one cause of poor water quality is a lack of aquarium maintenance. We all dream of an aquarium that takes care of itself, but the truth is that the water quality in our tanks changes in time, and the smaller the tank, the faster this happens.

    Excess nutrients cause water quality issues, and the two most effective ways of reducing these nutrients are to limit the amount that goes in and to remove as much as possible.

    If you have too many fish in your aquarium, you’ll need to feed them a lot, and they will produce a lot of waste. Consider stocking your tank with fewer fish if you want to minimize your maintenance needs.

    Water Changes

    Even with a low-stocking rate, nitrate levels will slowly climb, leading to algae outbreaks and many other issues. Performing more water changes is the simple solution to reducing these excess nutrients.

    But how often should you perform water changes? And how much water should you change each time?

    Nitrates and phosphates build up at different speeds in different tanks, so the only way to answer these questions is to test your water regularly. Nitrate levels of 20 ppm or lower are considered ideal for fish, although you can usually let them rise to double that without problems.

    Put simply, if your aquarium water has a nitrate reading of 30 ppm, a 50 percent water change will bring it down to about 15 ppm. If it takes two weeks to return to 30 ppm, then a 50% water change every two weeks may be necessary.

    6. Grow Plants

    Healthy plants will compete with brown and green algae to suppress their growth. Live plants use light and nutrients to grow, just like brown algae, and we can all agree that aquarium plants look much better than diatoms!

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    However, growing healthy, vigorous plants is not as simple as throwing them into your tank and hoping for the best. Different aquarium plants have different needs, so while some plants will grow like weeds without any care, others will need experience, time, and some extra equipment to flourish.

    Here’s what you need to know about plant care:

    • Aquatic plants need light to grow

    Use purpose-made aquarium lights to provide the right spectrum of light for your plants, and run your lights on a timer for 6 – 8 hours each day to simulate a natural photoperiod (day/night cycle).

    • Plants need nutrients

    You’re probably wondering how adding nutrients could be beneficial when your goal is to reduce nutrients. Well, plants will use nutrients in the water from excess food and fish poop, but they also need other nutrients from fertilizers to perform at their best.

    Remember, healthy growing plants will use up the nutrients in the water column before the brown algae, and basically beat them at their own game.

    • Plants need Carbon Dioxide

    Did you know that plants breathe in carbon dioxide (CO2) and breath out oxygen? Fortunately, CO2 occurs naturally in our aquarium water column. But some plants need increased levels to thrive.

    If your goal is to simply get rid of algae, choose plants that do not need injected CO2 to thrive. If you want a jaw-dropping aquascape full of colorful plants, however, you will want to invest in some extra equipment.

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    • Plants attach themselves in different ways

    Aquarium plants fall into three categories; the fastest and easiest are the floating plants. Species like hornwort will float in the water column, soaking up nutrients and competing with diatoms and other algae types like blue-green algae.

    Epiphytes do not float or drift but rather anchor themselves to solid structures like rocks and driftwood. These plants use their roots to hold on and to capture nutrients from the water column. Epiphytes will compete with brown algae, although they tend to be slower growers than floating plants.

    Rosette plants and rooted stem plants send their roots down into the soil, sand, or gravel to anchor themselves and collect nutrients. Some rooted plants need quality aquarium soil to thrive.

    7. Add Animals That Eat Them

    Growing live plants is an excellent way to combat many algae species in the aquarium, but there’s another way to use aquatic life to your benefit. One of the easiest (and most fun) ways to control brown algae is to add algae eaters!

    Various fish and snail species eat brown algae, and these creatures can be fascinating to keep. While these animals will remove brown algae, they cannot solve the cause of the problem.

    Let’s quickly look at some great species that can help you eliminate brown algae.

    • Otocinclus catfish

    The otocinclus catfish is a small freshwater fish with a big appetite for algae and diatoms. These fish grow to just 2 inches, and they can be kept in tanks as small as 10 gallons.

    • Amano shrimp

    Amano shrimp are another excellent option for diatom control in a freshwater aquarium. These interesting inverts are perfect for planted tanks, but beware, larger fish will eat them.

    • Nerite snails

    Nerite snails are hard-working creatures that love to eat diatoms. There are a few different species available, and most have awesome shell patterns or shapes.

    Some aquarium snails tend to breed out of control, but not the mighty nerite. These snails cannot breed in freshwater.

    • Plecostomus

    Plecos are armored catfish from South America that love to snack on brown algae. There are many species of plecostomus catfish, ranging from the strange bristle nose pleco at 4 to 5 inches to the common pleco that can reach 20 inches. Naturally, choosing the right species for your tank size is pretty important!

    • Lawnmower blenny

    So far we’ve only focused on freshwater species that eat brown algae, but there are many great options for marine aquariums too!

    The lawnmower blenny is a great little reef fish that grows to just a few inches and is suitable for reef tanks of 30 gallons or more. These expertly camouflaged bottom dwellers may take up to 3,000 bites each day, so they’re great for removing brown algae.

    • Trochus snails

    Trochus snails are another excellent option for marine tanks. These conical gastropods come in many patterns and colors, and the various species range from 1 to more than 3 inches across. Trochus snails are easy to care for, easy to breed, and they eat diatoms and blue-green algae.

    8. Try Phosphate Removers

    It is possible to control diatoms by reducing the amount of silicates in the water. Products like Phos-Zorb from API and Phosguard from Seachem remove both silicates and phosphates from the water to suppress brown algae growth.

    9. Use Reverse Osmosis Water

    If your tap or well water is very high in silicates, your best option might be to use reverse osmosis (RO) water or RODI water in your aquarium. Reverse osmosis water is pure water that has all contaminants and minerals removed through a filtration process.

    However, it is important to note that RODI water for freshwater fish is completely pure and unsafe for fish unless it has been remineralized. Another option is to simply ‘cut’ or mix your tap water with RO water to reduce the silicate levels.

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    FAQs

    Why am I getting this in my Aquarium?

    The most common causes of brown algae in fish tank water are an imbalance of nutrients in a new tank, excess silicates, and excess nutrients like nitrates and phosphates. This kind of algae is very common in new aquariums and usually disappears after a few weeks.

    What eats it in an aquarium?

    Many aquarium algae eaters will happily feed on brown algae in fish tanks. Otos, plecos, and nerite snails are all great options for freshwater tanks. Saltwater clean-up crew like lawnmower blennies, trochus snails, and cerith snails are perfect for reef tanks.

    Is it okay to have it in an aquarium?

    Brown algae is usually harmless, except for extreme cases. A little brown algae in a new aquarium is perfectly normal, but abundant diatom growth in established tanks is a sign of nutrient imbalances or other problems.

    Does having it mean my aquarium is cycled?

    Brown algae is a sign that your tank is going through the cycling process rather than proof that cycling is complete. The best way to know if a new aquarium is cycled is to test the water parameters. A cycled aquarium will read zero ammonia and zero nitrites but show detectable nitrates.

    What causes it to grow in a freshwater aquarium?

    Brown algae loves fish tanks with high nitrate, phosphate, and silicate levels. Nitrates and phosphates increase as uneaten food and fish waste accumulate in your tank, and silicates usually occur in varying levels in well and tap water.

    What kills it in Aquariums?

    The best way to stop brown algae is to starve it by making your aquatic environment unsuitable for its needs. Simply killing the algae will not remove the cause of the problem, so avoid using any harsh chemical treatments.

    Final Thoughts

    Brown algae in fish tanks is something that most fish keepers will need to deal with from time to time. If you have a brown algae outbreak in a new aquarium, keep calm and allow it to work itself out. If your problem is in an established tank, run through the causes and solutions explained in this article for the best chance at removing brown algae for good!

    Have you gotten rid of brown algae in your tank? Tell us about your experiences in the comments below!


    🌿 Want to learn more? This article is part of our complete Planted Tank & Aquascaping Guide. your ultimate resource for aquarium plants, aquascaping styles, substrates, and more.


    🐟 Want to learn more? This article is part of our complete Aquarium Care Guide. your ultimate resource for water chemistry, maintenance, feeding, disease prevention, and everything you need for a healthy tank.

    References

  • Red Devil Cichlid Care Guide: What You Need to Know Before You Buy

    Red Devil Cichlid Care Guide: What You Need to Know Before You Buy

    Red devil cichlids earn their name. They’re large, bold, and genuinely aggressive. And in 25+ years I’ve seen plenty of them rehomed by people who underestimated just how much personality (and destruction) one fish can bring to a tank. That’s not a knock against the species. It just means they’re a commitment, not an afterthought.

    The fish that needs its own tank, its own filter, and its own insurance policy.

    The Red Devil does not share. It does not compromise. It owns the tank, and everything in it is either food or a target.

    What Most Care Guides Get Wrong About Red Devil Cichlid

    The most common misconception about red devil cichlids is confusing them with Midas cichlids (Amphilophus citrinellus). Most fish sold as “red devils” in stores are actually Midas cichlids or hybrids between the two species. True red devils (Amphilophus labiatus) have noticeably thicker lips and a slightly different body shape. This matters because their temperaments differ. True red devils are even more aggressive than Midas cichlids, which is saying something. The other myth is that their aggression is managed by adding more fish. Unlike mbuna where overstocking can spread aggression, adding more fish to a red devil tank just gives them more targets.

    Table of Contents

    Red devil cichlids are among the most aggressive freshwater fish in the hobby. They will kill tank mates, bite your hand during maintenance, and rearrange everything in the tank on a daily basis. This fish does not coexist with anything. I have seen red devils crack heater guards and move rocks that weigh more than they do. If you want a pet with personality, this delivers. If you want a peaceful tank, look elsewhere. The fish that bites back and means it.

    The Reality of Keeping Red Devil Cichlid

    There is no sugarcoating this. Red Devils are demanding, aggressive, and destructive. Here is what owning one actually looks like.

    They destroy everything. Heaters, thermometers, decorations, plants. If a Red Devil can move it, it will. If it cannot move it, it will try. Use external heaters, protected equipment, and heavy rocks that cannot be displaced.

    Tank mates are not an option. Most Red Devils end up as solo fish because they attack and kill everything else in the tank. Some keepers have success with similarly-sized aggressive cichlids in very large tanks (150+ gallons), but this is the exception, not the rule.

    They bite. Red Devils will bite your hand during water changes and maintenance. This is not playful nipping. They have strong jaws and it hurts. Use caution or tools during tank maintenance.

    They need massive filtration. A 12 inch Red Devil produces an enormous amount of waste. You need canister filtration rated for at least double your tank size, and water changes of 30 to 50 percent weekly are mandatory, not optional.

    Biggest Mistake New Red Devil Cichlid Owners Make

    Buying one as a juvenile and thinking you can keep it with other fish. That cute 3 inch baby will be an 12 inch tank terror within a year, and by then your other fish are already dead or traumatized.

    Expert Take

    If you want a Red Devil, plan for a 75 gallon species-only tank from day one. Invest in a canister filter rated for twice the tank volume. Accept that this is a solo pet fish with a personality closer to a dog than a typical aquarium fish. If that sounds like your kind of challenge, a Red Devil will not disappoint.

    Key Takeaways

    • The red devil cichlid is a large, aggressive freshwater fish that needs a large tank
    • They grow over 12 inches with males being larger
    • They make wonderful pets for experienced fish keepers, but they are known to attack other fish and even bite human hands
    • It is easiest to keep the red devil cichlid in its own tank without other fish

    Fish Species Overview

    Scientific NameAmphilophus labiatus
    Common NamesRed devil cichlid
    FamilyCichlidae
    OriginNicaragua, Central America
    DietOmnivore
    Care LevelModerate
    ActivityHigh
    Lifespan10 to 12 years
    TemperamentAggressive
    Tank LevelAll levels
    Minimum Tank Size75 gallons
    Temperature Range70 – 78 °F
    Water Hardness6 – 25 dGH
    pH Range6.0 – 8.0
    Filtration/Water FlowModerate to high
    Water TypeFreshwater
    BreedingEgg Layer
    Difficulty to BreedModerate
    CompatibilityLimited, Species-only tank
    OK, for Planted Tanks?No

    Classification

    Taxonomic RankClassification
    Common NameRed Devil Cichlid
    Scientific NameAmphilophus labiatus
    OrderCichliformes
    FamilyCichlidae
    GenusAmphilophus
    SpeciesA. Labiatus

    Origins

    The red devil cichlid is native to Lake Managua and Lake Nicaragua, two large freshwater lakes in the Central American country of Nicaragua. These Nicaraguan lakes provide naturally warm waters throughout the year.

    These feisty fish have been introduced to a few places in the world, and wild populations exist in Florida and Hawaii today.

    Appearance

    The red devil cichlid is a large, attractive freshwater fish that comes in a range of colors. Wild fish are often gray or dark brown but specimens in the aquarium trade stand out with white, yellow, orange, and even bright red shades.

    Red-Devil-Cichlid-Amphilophus-labiatus

    They may be a single color or a combination, with many fish having attractive spots and patterns. Many specimens change color as they mature, so a full-grown adult may look quite different from when you first bought it.

    Male red devil fish are larger than females and develop a pronounced bump (nuchal hump) above their heads. Red devils are characterized by their large, thick lips, although this feature is much more pronounced in wild-caught fish.

    Red devil cichlids have large dorsal and anal fins that end in a sharp point, sometimes extending to the end of their fan-shaped tails.

    The red devil cichlid is easily confused with another popular Central American species known as the Midas Cichlid (Amphilophus citrinellus). However, the red devil grows larger and have thicker lips.

    How Big Can They Get?

    The red devil cichlid is a large, heavily built fish. Adults can measure 12 to 15 inches when fully grown, and males are the larger sex.

    Red devil cichlids are often sold at just an inch or two, but they grow to reach adult size in just three years or so.

    How Long Do They Live?

    The red devil cichlid can live for over ten years with good care. Their average lifespan is about 10 to 12 years, making them a similar commitment to the average dog.

    These fish will live longest if given plenty of tank space, high water quality, and a healthy, balanced diet.

    What Do They Eat?

    Feeding your red devil cichlid is one of the easiest aspects of its care. These true omnivores eat insect larvae, snails, small fish, and plant material in nature.

    Captive specimens are not fussy, and high-quality cichlid pellets are the best option for their daily needs, although young red devil cichlids will eagerly accept tropical fish flakes.

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    Supplement the red devil cichlid diet with the following foods to improve their general condition:

    Live Foods

    Live foods provide a great natural source of nutrition for your red devil cichlid. These fish regularly hunt live prey in nature, so they certainly have that killer instinct. Live foods like earthworms, crickets, and cockroaches are great choices.

    How Often and How Much to Feed them

    Feed your red devil cichlid at least twice each day, providing only as much food as your fish will eat. Remove any uneaten food before it spoils in your tank water.

    Red devil cichlids is excitable around mealtimes, and they will often crash into the hood of your aquarium when taking food from the surface. Make sure your lid is securely fitted and solidly built.

    Weigh down lightweight hoods to keep them securely in place, and take care when feeding these fish, as an accidental bite is pretty painful.

    Temperament and Behavior

    The red devil cichlid is an aggressive fish, and they aren’t called devils for nothing! However, these colorful cichlids make wonderful pets that love to interact with their owners.

    Nevertheless, many specimens will bite the hand that feeds them, and larger fish can easily draw blood. In extreme cases, you need to use a divider to keep your fish to one side when performing tank maintenance.

    Red devils are not fish you can add to a community aquarium. These guys need careful planning and a tank that is designed around their needs. However, it is possible to keep them with some other fish types.

    Continue reading to learn about the best red devil cichlid tank mates.

    Red Devil Cichlid Tank Mates

    Choosing tank mates for your red devil cichlid is challenging because these fish are just so aggressive. It is best to keep them in a species-only tank because they have such great personalities that you don’t need any others.

    Nevertheless, multi-fish tanks are possible, but you should always have a plan B in case things don’t work out. Keeping your red devil cichlid with other fish will require an enormous aquarium, so consider the size and weight of a 180 + gallon aquarium before committing to this kind of setup.

    Best Tank Mates For Them

    It is possible to keep these fish with other red devil cichlids when they are young, but they will become increasingly aggressive as they mature. Introducing all the tank mates when they are young is the best chance of creating a harmonious fish tank, but there are no guarantees when it comes to the red devil.

    Common Pleco in Aquarium

    Some freshwater fish have lived side by side with the red devil cichlid. Plecos are one of them, although these bottom feeders will become strictly nocturnal to stay out of the red devil’s way.

    Other possible options are large cichlids like Jack Dempseys, Texas, Midas, and jaguar cichlids, but again, having a spare tank is important if things go wrong.

    Least Compatible Fish For Them

    Most fish will not get along with the red devil cichlid. Smaller fish may be eaten, while others may be attacked and killed.

    Red devil cichlids become particularly aggressive when breeding. They will kill any other fish in their tank during this time.

    Care

    Red devil cichlids are not ideal for beginner aquarists. That being said, their care is relatively straightforward for more experienced fishkeepers, especially if you start out with the right tank setup.

    Read on to learn more about red devil cichlid care, their tank size, and setup needs.

    Tank Requirements

    The red devil cichlid needs a large aquarium with stable decorations, a secure hood, and a fine sand substrate. Keep reading for more information.

    Tank Size

    Red devil cichlids are large fish that need plenty of room. You can start out with a 55-gallon tank, but a 75-gallon setup will be best for a single fish in the long run. You could also keep a pair in this size tank, but stepping up to a larger size is a better bet.

    Setup

    Keeping red devil cichlids is all about the fish, so don’t design a complicated aquascape. These fish rearrange their tank regularly, so choosing the right decor is very important.

    Decor

    Providing a cave or shelter is a great way to ensure your fish has a place to relax and feel secure. However, safety is a very important consideration when choosing decorations for red devil cichlids.

    These fish love to dig, and they can destabilize rock piles and driftwood arrangements, causing them to collapse. This will cause injury to your fish or even crack your aquarium!

    Avoid placing decorations on top of deep sand. If you don’t want to make a rock arrangement for your fish, secure each component with an aquarium and fish-safe epoxy.

    Substrate

    A fine sand substrate is ideal because it will allow your fish to dig without scratching or injuring themselves.

    Live Plants

    Red devil cichlids are not recommended for a planted aquarium because they are notorious for tearing up all sorts of aquatic plants.

    Water Quality And Filtration

    Maintaining high water quality is essential in any aquarium; your red devil tank is no exception.

    Filtration & Aeration

    Powerful filtration is vital when keeping these large and messy fish. Red devils is hard on aquarium equipment like filters and heaters, so external hardware is often the best choice. Canister filters with integrated heaters (or you can get an in-line heater) are a great option because they limit the amount of hardware that your red devil cichlid can reach.

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    A sump system is recommended for larger tanks. Larger hang-on back and internal power filters do not have enough to capacity to house adult cichlids. Their activity will also damage internal filters and sponge filters.

    Red devil cichlids are native to stillwater environments, so aim for moderate water movement to avoid stressing your fish. Although it’s not essential, an airstone or two will increase aeration in your red devil cichlid tank and increase the activity levels of your fish.

    Water Parameters

    Red devil cichlids is kept in water with a pH of 6 to 8, although right around neutral is preferred. Ideal temperatures range from about 70 to 78 degrees Fahrenheit, and they will thrive in water hardness of 6 to 25 dGH.

    Aquarium Maintenance

    Regular aquarium maintenance is essential for keeping your red devil cichlid tank looking great and keeping your fish in excellent health.

    Perform a 25-30% water change on your aquarium each week to reduce the build-up of nitrates in your water. This is also a great time to clean up your glass, vacuum up waste from the substrate, and perform any maintenance on your equipment.

    Testing Tank Conditions

    The only way to really know what’s going on in your water chemistry is to test regularly. Red devil cichlids can survive in a reasonable range of water parameters, but you should strive to maintain stable conditions in your tank.

    Pick up a test kit that can monitor the following important parameters:

    Breeding

    Breeding red devil cichlids is easy – just make sure you’ll be able to find homes for all the young freshwater fish before you start!

    Sexing

    The first step toward breeding red devil cichlids is to acquire a breeding pair. Fortunately, adult red devil cichlids are easy to sex. The male red devil cichlid is bigger (up to 15 inches) and has a bigger nuchal hump. Females max out at about 10 inches and have a lighter build and a flatter forehead.

    Red-Devil-Cichlid-As-An Adult

    However, forming a pair is easier said than done since males can kill females if they don’t hit it off. Growing out a few young red devils in a large tank and allowing a pair to form naturally is one safe technique, but the other fish will need to be removed for their safety.

    These fish can reach spawning age when they are about 6 inches long if healthy and well-conditioned.

    Conditioning

    Your fish should be in excellent condition before starting your breeding project. Pay extra attention to their water quality through frequent maintenance and provide plenty of live and frozen foods.

    Raising the tank temperature to 75 – 78 degrees, Fahrenheit can trigger spawning since this replicates the natural temperature increase in their breeding season.

    The Breeding Process

    Red devil cichlids spawn on hard, level surfaces like a flat rock, or the walls or ceiling of a cave. The female will lay hundreds of eggs which the male then fertilizes.

    The fertilized eggs will begin to hatch after about three days and will be closely guarded by the adult fish. After hatching, the young fry will be moved to a hole in the substrate and become free swimming within another week or so.

    Males becomes aggressive toward female red devil cichlids at this point, so make sure you include a few secure hiding places and caves that are too small to fit the male. A divider is necessary.

    Caring for Fry

    Red devils are large fish, and you can expect a lot of babies after a successful spawn. Be prepared to see 300 to 800 red devil cichlid fry! The fry gets all the nutrients they need from their yolk sac, but they will require food after their fourth or fifth day.

    Baby brine shrimp and crushed flakes are great starter foods for these fish. You can feed the fry directly using a turkey baster or a large syringe with some airline tubing.

    The adult fish (video source) are very protective over their fry, although you can move the baby fish to their own tank to avoid any chance of them being eaten by their parents. Move the female to her own tank, if you choose to separate the fry as this can trigger extra aggression from the male.

    Health And Disease

    Red devil cichlids are not particularly prone to health problems, and they are relatively trouble-free if maintained in good conditions. Like any fish species, they are most likely to develop problems when stressed by poor water quality, inappropriate food, or conflict with other fish.

    Evaluating their Health

    The best way to monitor your fish’s health is to observe their physical appearance and behavior. Make the time to watch your fish for a few minutes in the morning and evening each day, and pay attention to any noticeable changes.

    Healthy fish have vibrant colors, complete fins that are not held clamped against the body, and a healthy appearance without sores or wounds.

    Buoyancy issues like floating or sinking are something to watch out for, as well as low activity levels and a lack of appetite.

    Common Health Issues

    Red devil cichlids can contract various illnesses that commonly affect freshwater fish species. Consult your veterinarian for more information on treating illnesses in your fish.

    • Ich

    Ich or white spot disease is one of the most common illnesses that affect freshwater fish, and it is serious if left untreated. This parasitic infection is caused by protozoa and often flares up in stressed fish.

    Ich is treated with aquarium salt, heat treatments, or specially formulated medications like ich-X.

    • Fungal infections

    Fungal infections can cause fluffy growths on your fish’s skin, gills, and fins. This form of illness often arises from poor water conditions, so a targeted treatment with antifungal medication and better aquarium hygiene are recommended for the best results.

    • Physical injuries from fighting

    Red devil cichlids have an aggressive nature, and they are often kept with other aggressive freshwater fish. Fights happen, and these powerful cichlids can easily damage each other with their powerful jaws and sharp teeth.

    It’s very important to have a spare fish tank available if you keep red devil cichlids with other fish, even of the same species. Separate your fish immediately if you see signs of serious aggression and treat their wounds when necessary.

    • Bacterial infections

    Fish are susceptible to many bacterial infections, particularly when injured or kept in poor water quality conditions. These infections is treated with antibiotics, available online, from aquarium stores, or from your local veterinarian.

    Where To Buy

    Red devil cichlids are very affordable if bought young. You can find these aggressive cichlid species online or at many aquarium stores. Unfortunately, red devils often hybridize with other cichlid species like Midas and Texas, so buy from a reputable breeder to be sure your fish are purebred.

    FAQs

    Do They Eat Fish?

    Red devil cichlids are omnivorous fish with large mouths and they will eat any fish small enough to swallow. However, avoid providing feeder fish as this can introduce infectious diseases to your tank.

    How Can You Tell If They Are Male Or Female?

    Young red devil cichlids are very difficult to sex, although older fish develop distinct physical differences as they mature. An adult male will grow larger and develop a more prominent nuchal hump above his head than a female red devil.

    What Do They Eat?

    Red devil cichlids will eat just about anything you give them. A balanced diet of quality cichlid pellets supplemented with live/frozen foods and vegetables will keep your red devil cichlid healthy.

    What Is The Difference Between This Fish And Midas Cichlid?

    The red devil cichlid is easily confused with the Midas cichlid. Both fish come from the same family and genus, and they will readily interbreed to produce hybrids. Younger red devils look very similar, but adults grow longer, have thicker lips, and have a longer sloped forehead than Midas cichlids.

    How Fast Do They Grow?

    Red devil cichlid fry grow quickly and begin to change color by the time they reach about two inches long. They may reach 8 to 10 inches within a year if well-fed and cared for, but their growth rate slows after that.

    How long does it take for them to reach full size?

    Red devil cichlids take about three years to reach their adult size. However, they can live for over ten years and will continue to grow slowly throughout their lives.

    Is the Red Devil Cichlid Right for You?

    Before you commit to this species, here’s an honest assessment of whether it fits your setup and experience level.

    • Only for experienced keepers who understand extreme aggression. This is not a fish for beginners or anyone who hasn’t managed aggressive cichlids before.
    • Need 75 gallons minimum for a single fish. A pair requires 125+ gallons, and even then, the female need to be separated during non-breeding periods.
    • Incredible personality and intelligence. Red devils are among the most interactive freshwater fish and develop strong bonds with their owners.
    • Best kept as a solo species. Tank mates are possible but risky. Even large, tough fish can be injured or killed.
    • Will rearrange everything. Decorations, substrate, heaters, filter intakes. Nothing is safe from a determined red devil.
    • Long-lived commitment. Healthy red devils can live 12-15 years, so be ready for the long haul.

    What It Is Actually Like Living With Red Devil Cichlid

    This is the part no other care guide gives you. Forget water parameters for a minute. Here is what it is actually like to share your tank with this species.

    They have enormous personality. Red Devils are among the most interactive freshwater fish. They recognize their owner, beg for food, and will display for you constantly. Some keepers describe them as underwater dogs.

    Feeding time is an event. A hungry Red Devil does not wait politely. It splashes, rams the glass, and makes itself impossible to ignore. Feeding this fish is entertaining and occasionally wet.

    They rearrange the entire tank. Gravel mountains, dug-out caves, displaced decorations. Your aquascape is a suggestion, not a reality, when a Red Devil lives there.

    Aggression is constant, not occasional. This is not a fish that gets aggressive during breeding and calms down afterward. Red Devils are aggressive all the time. Every day. That is their baseline personality.

    How the Red Devil Cichlid Compares to Similar Species

    Red devils are constantly compared to flowerhorns, partly because they’re one of the parent species used in flowerhorn creation. In terms of aggression, they’re roughly equal. Both are among the most aggressive freshwater aquarium fish. Flowerhorns are flashier with their pronounced nuchal hump and iridescent coloring, while red devils have a more natural, wild-caught aesthetic. Red devils is successfully bred in captivity as a pure species, which is something flowerhorns can’t match. If you value authenticity and want to work with a real species, the red devil is the choice. If you want maximum visual drama, the flowerhorn edges ahead.

    The Jack Dempsey is another large Central American cichlid that gets compared to red devils, but they’re in different leagues of aggression. Jack Dempseys are assertive but manageable in a well-planned community tank. Red devils will dominate and potentially injure any tank mate regardless of size. If you like the idea of a big, tough Central American cichlid but want more flexibility with tank mates, the Jack Dempsey is the safer choice.

    Final Thoughts

    A red devil does not share territory. It eliminates competition.

    The red devil cichlid is not for everyone. However, If you want a feisty, aggressive, and exciting pet that loves to interact, it is the perfect option for you! Just make sure you read through this guide carefully before adopting one of these amazing cichlids from Central America.

    Do you keep red devil cichlids? Tell us about your experiences in the comments below!


  • Boesemani Rainbowfish Care Guide: One of the Most Striking Community Fish You Can Keep

    Boesemani Rainbowfish Care Guide: One of the Most Striking Community Fish You Can Keep

    In my years working with rainbowfish, boesemani Rainbowfish at the pet store look nothing like adults. The washed-out silver juvenile turns into a half-blue, half-orange showpiece over months. But they need space, schools of 6 or more, and hard water.

    Juvenile boesemani look nothing like the adults on the box. Patience is the price of those colors.

    A mature male boesemani in breeding color rivals most saltwater fish for impact. You just have to wait for it.

    Hard Rule

    Boesemani rainbowfish need moderately hard water (GH 8-15) to show full coloration. In soft water they remain dull regardless of diet or lighting. Water chemistry is the primary color driver for this species.

    Table of Contents

    Boesemani rainbowfish are one of my go-to recommendations when people ask about community fish that actually look impressive in a planted tank. That blue-purple to orange gradient is genuinely striking. Especially when you have a school of 8 or more males competing and displaying. They’re one of those fish that look like they cost a lot more than they actually do.

    They’re peaceful, reasonably easy to keep, and get more beautiful as they mature and fully color up. Here’s what it takes to keep them healthy and showing full color.

    What Most Care Guides Get Wrong About Boesemani Rainbowfish

    Most guides give you a cookie-cutter care sheet for Boesemani Rainbowfish without mentioning the nuances. After 25+ years in this hobby, I have seen how small details in tank setup and maintenance make a real difference in long-term health. Another thing guides gloss over is temperament. Boesemani Rainbowfish are often described with a single label, but their behavior shifts depending on tank size, tank mates, and territory. You need to plan for the worst-case scenario, not the best. Group size is another area where most guides fall short. Saying ‘keep them in groups’ is not enough. The difference between keeping 3 and keeping 8 or more is night and day when it comes to coloration, confidence, and natural behavior.

    ASD Difficulty Rating: Tier 1/2 – Beginner-Intermediate

    Boesemani rainbowfish (Melanotaenia boesemani) are large, colorful schooling fish reaching 4 inches (10 cm). They need groups of 6+, 55-gallon minimum, and moderately hard water to bring out their vivid orange-blue coloration.

    Key Takeaways

    • Boesemani rainbowfish are colorful fish that can grow to be slightly larger than other freshwater community species.
    • These fish don’t have any special requirements, but they do best in heavily planted setups.
    • Boesemanis will outcompete other species for food, so tank mates need to be carefully chosen or a specific feeding method needs to be used.
    • These rainbows is bred in the home aquarium, which lessens the impact on dwindling natural populations.

    Overview Of The Fish Species

    Scientific Name Melanotaenia boesemani
    Common Names Boesemani Rainbowfish, Boeseman’s Rainbowfish
    Family Melanotaeniidae
    Origin Indonesia
    Diet Omnivore
    Care Level Moderate
    Activity Moderate activity
    Lifespan 5 to 10 years
    Temperament Peaceful
    Tank Level Middle
    Minimum Tank Size 40 gallons
    Temperature Range 72. 77° F
    Water Hardness 9. 19 KH
    pH Range 7.0. 8.0
    Filtration/Water Flow Low to moderate
    Water Type Freshwater
    Breeding Egg Layer
    Difficulty to Breed Moderate
    Compatibility Community tanks
    OK, for Planted Tanks? Yes

    Classification

    Order Atheriniformes
    Family Melanotaeniidae
    Genus Melanotaenia
    Species M. Boesemani (Allen & Cross, 1980)

    Introduction To Boesemani Rainbowfish

    Everybody has tetras in their tank. We don’t blame them. Tetras are small yet colorful fish that can make any tank come to life.

    But isn’t there another, more unique alternative that’s just as colorful and exciting?

    Yes! Past the tetras and the rasboras, there’s a wide variety of rainbowfish species available for beginner to expert hobbyists. These fish have all the characteristics that make tetras desirable but offer a new shape and personality to the community fish tank. The Boesemani rainbowfish, scientifically known as Melanotaenia boesemani, is one of the most popular species of rainbowfish available in the aquarium hobby.

    Though these fish are very popular in the hobby and have been successfully bred commercially, they are, unfortunately, endangered in their wild natural habitat ecosystems and listed on the IUCN Red List of endangered species. This is a direct result of harvesting done by the aquarium hobby, so it is strongly encouraged to ethically source the next rainbowfish that you add to your tank.

    Otherwise, rainbowfish are large, active schooling fish that is kept in moderately sized aquariums. They get along with most freshwater community fish species and are hardy to most aquarium water parameters.

    Origin and Habitat

    The Boesemani rainbowfish is one of the most colorful species of fish that occurs naturally in the wild. These blue and orange fish have a very limited natural range, with populations existing only in the tri-lake region of Indonesia known as Ajamaru. Some other populations have been found in nearby lakes, namely Lake Hain and Lake Aitinjo.

    There, Boesemani rainbowfish stay in the shallow waters. They is found in dense vegetation where they school and reproduce. Though the waters from these lakes are naturally hard with high pH, Boesemani rainbowfish have been found in various hardness and pH conditions. This has made acclimating them to the water parameters preferred by aquarium fish that much easier.

    As we’ll see, these fish do best in heavily planted aquariums with low to moderate water flow.

    Appearance

    Rainbowfish have unique appearances that make them attractive to hobbyists who want something a little different from your typical tropical fish. There are many different species of rainbowfish available, with some staying small and others growing large with special features.

    Boesemani Rainbowfish

    The true appeal of this rainbowfish is its colors. There is no other fish that compares! The Boesemani rainbowfish is brightly colored with blues, yellows, oranges, and even greens. Male Boesemani rainbows feature the greatest contrast in colors, with the first half of their body being a dark blue that slowly fades into a deep orange by their tail fin. In contrast, females are solid silver or yellowish-green with lighter-colored bellies.

    The Boesemani rainbow also has an interesting body shape. They have a deeper body with long dorsal and anal fins. Female fish aren’t as deep-bodied, but can still easily be told apart from other species.

    How Big Do They Get?

    The Boesemani rainbowfish is a moderately sized species of rainbow. Male fish grow to be slightly larger than females, maxing out at about 5 inches. Females stay under 4 inches at adult size.

    Boesemani Rainbowfish Care

    Boesemani rainbowfish care is easy, though there are some special considerations that should be taken into account before buying them. If given the right aquarium setup, though, these fish can live for relatively long times and will bring new colors to a fish tank.

    Are They Easy To Keep?

    In general, Boesemani rainbowfish are very easy to keep: they’re hardy fish that have been bred to withstand most conditions seen in the aquarium hobby. However, they are large, active fish that will be overbearing for other species.

    Despite their larger size, they can also be somewhat skittish fish. Because of this, it’s essential to keep them in sizeable groups with an appropriate ratio of female to male fish. This grouping setup will also help increase color expression from the males while also lessening the harassment between males and females.

    To help make your fish even more comfortable in its tank, a heavily planted setup is recommended.

    Aquarium Setup

    Unlike tetras and other popular tropical fish, Boesemani rainbows should be given some special consideration when setting up their tank. These fish shine best when given the right conditions.

    An ideal Boesemani aquarium setup would be filled with dense vegetation at all levels of the aquarium. These fish mostly swim in the middle but will gladly venture to the tops and bottoms of the tank to look for food. To help make them more comfortable, add live plant species that grow in the foreground, midground, and background. Otherwise, regularly prune plants to create a layered effect.

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    Rocks, driftwood, and other natural aquarium decorations may be added to create depth and interest as well as various hiding spots for your fish. Make sure to keep plenty of space open in the middle of the tank as these rainbows like to swim! While unlikely to jump out of the aquarium, it’s recommended to use an aquarium lid that stops any overly adventurous fish.

    Tank Size

    We list Boesemani rainbowfish as moderately difficult fish to keep due to their relatively demanding tank size. These are larger-than-average tropical fish that need plenty of room to swim and school. That being said, they don’t require a massive setup, either.

    Boesemani rainbowfish need a minimum tank size of 40 gallons. Any smaller than this reduces the number of rainbows that is kept together and the other species that is added. Any aquarium larger than this greatly increases the possibility of keeping other rainbows and species.

    Remember that a lot of aquarium space will be lost to plants and decorations in a heavily planted tank.

    Water Parameters

    Boesemani rainbows are hardy fish. They’ve been successfully bred in the aquarium industry, meaning they have been comfortably kept in many different water parameters. This also means that they’ve been exposed to many common freshwater diseases, helping their immune systems recognize and overcome pathogens faster and easier.

    These rainbowfish do best when kept in tropical water conditions with a constant water temperature between 72. 77° F. While a tropical species, hobbyists report having greater success keeping their Boesemanis in slightly cooler water temperatures.

    As mentioned before, Boesemani rainbowfish have been found in varying pH levels. In general, the aquarium should be kept at neutral pH, between 7.0. 8.0. Water hardness should remain between 9. 19 KH, but they are highly adaptable to changing hardness levels as well.

    Filtration and Aeration

    Boesemani rainbows don’t mean to be messy, but their size, activity, and willingness to eat anything can make for a high bioload. Luckily, plants help uptake nutrients and other wastes to perform food production. This reduces the need for extensive tank maintenance, though some care is still needed.

    An adequately sized filter is highly recommended for a Boesemani rainbowfish tank. This filter should be rated for at least 2x the tank size to help remove waste and provide water circulation. These rainbows are strong swimmers and are able to swim against a moderate water flow but need areas of lower flow. Consider the types of live plants you plan on keeping too. Many species prefer gentle water movement.

    Additional aeration is always welcomed and is achieved through a sponge filter and/or air stone. A large sponge filter or several smaller ones can create low water movement while also facilitating gas exchange, which is important for plant health. An air stone can also be attached to an air pump for aesthetic purposes or for better gas exchange.

    Lighting

    The type of lighting you need for your tank depends on the types of plants being kept. Boesemani rainbowfish is skittish with other active species and sudden shadows, but they can be kept under higher lighting setups as long as an aquarium lid is secured. In other words, these rainbows won’t avoid swimming out in the open just because of high lighting conditions.

    Instead, base the amount of lighting on the species of live plant being kept. Even with high lighting, rainbowfish will use their natural habitat to hide if they feel uncomfortable or stressed; if you do find that your fish is hiding in the shadows, try adding more live plants, floating plants, or structures to increase available areas for relief.

    Aquarium Plants and Decorations

    Aquarium plants are a must for Boesemani rainbows. These fish originate from very densely planted areas which provide them with food and shelter. It seems counterintuitive, but the more places you have available for your fish to hide, the more likely they’ll be out in the open.

    Aquarium plants also make for a healthy tank. In order to perform photosynthesis and grow, plants need nutrients. The fish and invertebrates provide these nutrients in the aquarium. As these excess nutrients are used, the water is cleaned, meaning less work for the hobbyist. This also means that additional fertilization may be necessary if enough nutrients aren’t naturally entering the system.

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    In addition to plants, rocks, and driftwood, other aquarium-safe decorations may be added to your rainbowfish tank. Make sure that these objects are securely placed, as Boesemanis can bump into them and knock them over when going at high speeds.

    Tank Maintenance

    Because most rainbowfish are kept in well-planted tanks, tank maintenance is low. In fact, some aquarium keepers leave their Boesemani tanks unfiltered, leaving the live plants and fish to find a balance between nutrient input and output; we only recommend this Walstad method for very experienced hobbyists.

    Still, regular weekly or biweekly 10-25% water changes are recommended. Performing water changes helps remove waste caught around the stems of plants while also introducing new, nutrient-rich water for plants to use. If using a pure source of water, like from reverse osmosis, then minerals will need to be manually added back in.

    If dosing fertilizers, regularly use a dependable water testing kit to see how nutrients are moving throughout the system.

    Substrate

    Boesemani rainbowfish is kept on any substrate. A dark substrate will help complement and intensify their coloration but it isn’t necessary to make these fish bold.

    Instead, the substrate should be chosen with plants in mind. For this reason, many hobbyists use plant-specific substrates that facilitate healthy root growth. Another good alternative is aquarium-purpose river sand that comes in various color grades.

    Community Tank Mates

    For the most part, Boesemani rainbowfish are peaceful fish that is kept with various species. The main concerns in choosing suitable tank mates for them are matching preferred water temperatures and activity levels.

    Can They Go In A Community Tank?

    Yes! Boesemani rainbows thrive in a community tank setting. They are often used as the featured species of the tank, with all other fish complimenting their movement and colors.

    Some of the best Boesemani rainbowfish tank mates include:

    Because these rainbows prefer harder water, experienced keepers have had luck keeping them with some of the more peaceful species of African rift lake cichlids. Avoid smaller, slow-moving fish tank mates that could easily be overwhelmed and outcompeted.

    Boesemani rainbowfish are schooling fish that love to be in their own company. However, an imbalance of males to females can lead to harassment, so it’s recommended to keep 2 to 3 females for every male fish. At least 6 rainbowfish should be kept together at any given time.

    Can They Live With Angelfish?

    Boesemani rainbowfish can live with angelfish under certain conditions. Angelfish are slow-moving fish, but as cichlids, they can defend themselves. This pairing can work if the angelfish are larger than the rainbowfish and more aggressive. Otherwise, the Boesemanis may be too overwhelming and outcompete the angels.

    Food and Diet

    These rainbows happily accept any and all foods. They are active swimmers that need a lot of food to keep them going. A small portion of high-quality flake food may be given a couple of times throughout the day. This will help keep costs down while also encouraging your fish’s colors while fulfilling their appetite.

    Pellet Foods

    For a treat, Boesemani rainbowfish may be given a mixed diet of freeze-dried, live, and frozen foods. They especially love brine shrimp, bloodworms, tubifex worms, and mosquito larvae. As omnivores, they will also eat green vegetables, like spinach and cucumber. While these rainbows aren’t overly messy fish, regular feedings of protein-rich food can lead to water quality issues.

    While Boesemani rainbows might seem like they have large mouths, they actually have small throats, which can limit what they eat. Make sure to feed appropriately-sized live foods and cut up any pieces that might seem too big.

    Another concern with Boesemani feeding is that they are too ambitious. These are fast fish and even faster eaters. This can cause other fish to miss out and become stressed. To help mitigate this problem, try feeding Boesemanis sinking foods and the other fish floating foods. This should help keep all fish occupied with eating at different levels of the tank.

    Breeding Boesemani Rainbows

    Breeding Boesemani rainbowfish has been achieved at the commercial level. They are easy to breed in the home aquarium setting though it’s recommended to use a breeding tank. Raising their fry is somewhat challenging, and a breeding tank will provide the most control over conditions.

    To start breeding your Boesemani rainbowfish, place a group of females with one to two males. Feed high-quality food and a steady diet while raising the water temperature to about 80. 84° F and pH to slightly basic at 7.5. When ready, females will become plump, and males will intensify in color.

    As egg scatterers, female Boesemanis will freely release their eggs, and the males will fertilize them. Fine-leaved plants, like Java moss, or egg crate, is used to catch the eggs. Once the eggs have been fertilized, the adult fish may be removed from the tank to prevent them from eating the eggs.

    After about a week, the fry hatch. They will need to be given small foods, like infusoria, until they’re big enough to accept bigger foods, like baby brine shrimp. After a few months, they are ready to be given to another hobbyist or moved back to the display tank.

    Conclusion

    Boesemani rainbowfish are great fish for hobbyists looking for something new. These fish are just as easy as tetras and rasboras but offer new colors and shapes to add to the community fish tank setup. There are a few considerations needed when picking tank mates, as these rainbows is overly active and ambitious feeders, but they are not aggressive. They are also easy fish to breed for beginner hobbyists looking for a new challenge!

  • 13 Types of Freshwater Puffer Fish: Requirements, Tank Mates, and the FW/Brackish Confusion

    13 Types of Freshwater Puffer Fish: Requirements, Tank Mates, and the FW/Brackish Confusion

    Expert Take | Mark Valderrama — AquariumStoreDepot

    Pufferfish are some of the most intelligent, personable fish in the hobby. I have worked with them at the retail level for years, and the number one mistake I see is people buying them for a community tank. The puffer always wins that situation, and the community fish always pay for it. Know what you are signing up for before you bring one home.

    Freshwater puffers range from inch-long pea puffers to 2-foot fahaka puffers. All of them bite. All of them need specialized feeding. None of them belong in a standard community tank without serious planning.

    The cute factor wears off fast when your puffer eats your tetra collection on day two.

    That said, there are legitimately great true freshwater options. The pea puffer is the standout for planted and nano setups. The South American puffer is one of the few that tolerates community life. And the fahaka is as close to a wet dog as the hobby gets. Here is my breakdown of 13 species worth knowing, with honest notes on the freshwater versus brackish issue for each one.

    Key Takeaways

    • Freshwater puffer fish range from tiny nano species to real tank busters that need hundreds of gallons
    • Most pufferfish do best in a species-only setup; community attempts usually end with missing fins and dead tank mates
    • All puffers need meaty, hard-shelled food like snails and shellfish to keep their continuously-growing beaks worn down
    • Several “freshwater” puffers sold at retail are actually brackish species and will decline long-term in pure freshwater

    What Are They?

    Puffer fish belong to the Tetraodontidae family, found in fresh, brackish, and saltwater environments worldwide.

    These fish puff up by sucking in water or air, making them look two to three times larger to deter predators. If that does not work, tetrodotoxin in their skin is the backup plan. In captivity that toxin is not a practical concern, but you should never feed a puffer to another animal.

    The teeth are the part that matters most for care. A puffer’s beak is made of fused teeth that grow continuously throughout its life. Without hard foods to grind against, the beak overrows and the fish cannot eat. This is not theoretical. It happens regularly in tanks where owners feed only soft foods. Overgrown beaks require trimming under sedation, and most hobbyists are not equipped for that.

    Puffers are genuinely interactive fish. They recognize their owners, beg at the glass, and have distinct personalities. That is why they are addictive. But they are not fish you add to an existing setup. They are fish you build a tank around.

    Puffer Difficulty Tiers

    Beginner-Accessible

    Pea puffer, South American puffer. Small, true freshwater, manageable tanks. Still need live snails and proper filtration.

    Intermediate

    Fahaka, spotted Congo, hairy puffer, imitator, red-tailed dwarf. Require more space, stricter water quality, careful feeding schedules.

    Experienced Only

    Mbu puffer (500-gallon minimum), golden puffer (highly aggressive, rarely available). These are long-term lifestyle commitments, not tank additions.

    The Freshwater vs. Brackish Confusion

    This is the most important section in this article. Several species sold as “freshwater puffers” are actually brackish water fish that tolerate fresh water as juveniles but require salt as adults. Keeping them in pure freshwater long-term leads to chronic stress, immune suppression, and early death.

    The green spotted puffer is the most common offender. Juveniles are routinely sold in freshwater tanks at retail. Adults need specific gravity around 1.005 to 1.010 to truly thrive. The figure 8 puffer is another one, native to estuarine environments in Southeast Asia. It handles fresh water reasonably well compared to the green spotted, but it still benefits from low-level brackish conditions.

    True freshwater species: pea puffer, imitator, mbu, hairy puffer, spotted Congo, South American, fahaka, red-tailed dwarf, golden, ocellated, arrowhead, crested. These are the ones this article focuses on.

    Avoid Freshwater Puffers If…

    • You run a community tank and are not willing to rebuild it around the puffer
    • You cannot maintain a steady supply of live or frozen meaty foods (snails, bloodworms, clams)
    • You are buying for a 10-gallon or smaller setup and want anything beyond one pea puffer
    • You want a low-maintenance fish you can feed flakes and leave alone
    • Your household cannot handle a 100-gallon-plus commitment for a fahaka or mbu

    13 Freshwater Puffer Fish Species

    Species Max Size Min Tank Temperament Community Safe? True FW?
    Pea Puffer 1 in (2.5 cm) 5 gal (19 L) Aggressive With caution Yes
    Imitator 1 in (2.5 cm) 5 gal (19 L) Aggressive With caution Yes
    South American 3-4 in (7-10 cm) 30 gal (114 L) Semi-aggressive With caution Yes
    Spotted Congo 4 in (10 cm) 40 gal (151 L) Semi-aggressive With caution Yes
    Red-Tailed Dwarf 1.5-2 in (4-5 cm) 15 gal (57 L) Aggressive No Yes
    Hairy Puffer 5 in (13 cm) 30 gal (114 L) Aggressive No Yes
    Fahaka 17 in (43 cm) 100 gal (378 L) Highly aggressive No Yes
    Mbu 20-30 in (51-76 cm) 500 gal (1893 L) Aggressive With caution Yes
    Green Spotted 6 in (15 cm) 30 gal (114 L) Semi-aggressive With caution No (brackish)
    Golden 4 in (10 cm) 20-30 gal (76-114 L) Highly aggressive No Yes
    Ocellated 6 in (15 cm) 20 gal (76 L) Aggressive No Yes
    Arrowhead 6 in (15 cm) 20 gal (76 L) Aggressive No Yes
    Crested 2 in (5 cm) 15 gal (57 L) Semi-aggressive No Yes

    1. Pea Puffer

    Pea Puffer Eating Snail
    • Scientific name: Carinotetraodon travancoricus
    • Common names: Dwarf puffer, pygmy pufferfish
    • Origin: India
    • Adult size: 1 inch (2.5 cm)
    • Minimum tank size: 5 gallons (19 L)
    • Temperament: Aggressive
    • Community safe?: With caution
    • pH: 6.8-8.0
    • Water temperature: 72-82°F (22-28°C)

    The pea puffer is the entry point for most people getting into puffers, and that is appropriate. It is the most accessible of the group: small, true freshwater, widely available, and manageable in a planted tank. One fish works in a well-planted 5-gallon (19 L). A trio of one male and two females can work in a 15-gallon (57 L) if you have enough plant density to break line of sight.

    Do not let the size fool you. These are aggressive fish. Pea puffers have ended snail colonies, taken fin chunks from betta fish, and killed smaller tankmates. In a species-only or very carefully chosen community with fast-moving fish, they do fine. In a general community tank, they cause problems.

    Live snails are the preferred food. Keep a ramshorn or bladder snail colony running in a separate container and you will never run short. Frozen bloodworms and brine shrimp round out the diet. They will not touch dry food reliably.

    2. Imitator Puffer

    • Scientific name: Carinotetraodon imitator
    • Common names: Dwarf Malabar puffer
    • Origin: India
    • Adult size: 1 inch (2.5 cm)
    • Minimum tank size: 5 gallons (19 L)
    • Temperament: Aggressive
    • Community safe?: With caution
    • pH: 6.8-7.5
    • Water temperature: 76-82°F (24-28°C)

    The imitator is essentially the pea puffer’s rarer cousin, distinguished by brighter yellow coloration and fewer spots. Care requirements are nearly identical. This species shows up occasionally at specialty retailers but is not as consistently available as the pea puffer. If you find one, the care is the same: species-only or very careful community, live snails as the primary food.

    3. Mbu Puffer

    Tetraodon Mbu
    • Scientific name: Tetraodon mbu
    • Common names: Giant freshwater puffer
    • Origin: Central Africa (Congo River basin)
    • Adult size: 20-30 inches (51-76 cm)
    • Minimum tank size: 500 gallons (1,893 L)
    • Temperament: Aggressive
    • Community safe?: With caution in massive tanks only
    • pH: 7.0-8.0
    • Water temperature: 75-79°F (24-26°C)

    The mbu is the world’s largest true freshwater puffer. This is not a fish for a home aquarium in any conventional sense. A 500-gallon (1,893 L) is the stated minimum, and that assumes a single fish with no tankmates. Adults eat whole shellfish, crabs, and clams. Feeding one mbu can cost more per month than feeding a small dog.

    These fish are extraordinarily personable and intelligent. They are also a 15-20 year commitment with an animal that will outgrow most purpose-built fish rooms. People who keep them love them deeply. But this is a decision that should not be made impulsively.

    4. Hairy Puffer

    • Scientific name: Tetraodon baileyi
    • Origin: Laos and Thailand
    • Adult size: 5 inches (13 cm)
    • Minimum tank size: 30 gallons (114 L)
    • Temperament: Aggressive
    • Community safe?: No
    • pH: 6.5-7.5
    • Water temperature: 74-81°F (23-27°C)

    The hairy puffer is an ambush predator. It stays near the bottom or buried in substrate, waiting for food to come to it. The hair-like skin filaments break up its outline, helping it blend in. In a tank, this means you need sand or fine substrate that it can partially bury into and décor arranged to create ambush zones. Species-only. Not negotiable.

    5. Green Spotted Puffer

    Green Spotted Pufferfish in Aquarium
    • Scientific name: Tetraodon nigroviridis
    • Origin: South and Southeast Asia
    • Adult size: 6 inches (15 cm)
    • Minimum tank size: 30 gallons (114 L)
    • Temperament: Semi-aggressive
    • Community safe?: Brackish community with caution
    • pH: 7.5-8.5
    • Water temperature: 75-82°F (24-28°C)

    This is the brackish confusion species. Juveniles are sold in freshwater retail tanks constantly, and they survive for a while. But adults need specific gravity around 1.005-1.010 to truly thrive. If you want to keep green spotted puffers long-term, plan for a brackish setup before you buy.

    6. Spotted Congo Puffer

    • Scientific name: Tetraodon schoutedeni
    • Origin: Democratic Republic of Congo
    • Adult size: 4 inches (10 cm)
    • Minimum tank size: 40 gallons (151 L)
    • Temperament: Semi-aggressive
    • Community safe?: With caution
    • pH: 6.5-7.5
    • Water temperature: 78-81°F (26-27°C)

    The spotted Congo is the most community-tolerant of the African puffers. It can be kept in small groups and will sometimes coexist with other fish if there are no slow-swimming, long-finned targets. Standard puffer caveats apply: excellent water quality, hard-shelled food, no fin-nippers for tankmates.

    7. South American Puffer

    • Scientific name: Colomesus asellus
    • Common names: Amazon puffer
    • Origin: Amazon River Basin, South America
    • Adult size: 3-4 inches (7-10 cm)
    • Minimum tank size: 30 gallons (114 L)
    • Temperament: Semi-aggressive
    • Community safe?: With caution, in groups of 6+
    • pH: 5.5-8.0
    • Water temperature: 75-80°F (24-27°C)

    The South American puffer is genuinely the most community-compatible species on this list. It is schooling in the wild, which changes the dynamic compared to solitary puffers. A group of six or more in a large tank with fast-moving, similarly-sized fish has a real shot at working. This is the puffer for someone who wants puffers but still has a community setup they are not willing to tear down.

    8. Red-Tailed Dwarf Puffer

    • Scientific name: Carinotetraodon irrubesco
    • Common names: Red-tailed redeye puffer
    • Origin: Southeast Asia
    • Adult size: 1.5-2 inches (4-5 cm)
    • Minimum tank size: 15 gallons (57 L)
    • Temperament: Aggressive
    • Community safe?: No
    • pH: 6.0-7.5
    • Water temperature: 68-82°F (20-28°C)

    True freshwater, attractive markings, bright red eyes. Species-only tank. A small group of one male and several females can work in a heavily planted tank with significant hardscape. Males fight, so do not keep two males together without a large tank and dense cover.

    9. Fahaka Puffer

    • Scientific name: Tetraodon lineatus
    • Common names: Globe fish, Nile puffer
    • Origin: Central and North Africa
    • Adult size: up to 17 inches (43 cm)
    • Minimum tank size: 100-150 gallons (378-568 L)
    • Temperament: Highly aggressive
    • Community safe?: No
    • pH: 6.5-7.5
    • Water temperature: 75-79°F (24-26°C)

    The fahaka is a solitary, highly aggressive fish that will live alone for its entire life. No tankmates. Not even large ones. Fahaka puffers bite through aquarium heater cables, silicone seams, and anything else that interests them. Their beaks are powerful enough to draw blood from a careless hand during feeding. Diet is whole shellfish, crab legs, clams, and large snails. This fish is a commitment, but the relationship you build with one is unlike anything else in the hobby.

    10. Golden Puffer

    • Scientific name: Auriglobus silus
    • Common names: Gold green puffer, avocado puffer, bronze puffer
    • Origin: Southeast Asia
    • Adult size: 4 inches (10 cm)
    • Minimum tank size: 20-30 gallons (76-114 L)
    • Temperament: Highly aggressive
    • Community safe?: No
    • pH: 6.0-7.8
    • Water temperature: 74-80°F (23-27°C)

    Still rare in the hobby. Highly aggressive toward its own species and other fish. Each specimen typically needs its own tank. Beautiful fish, but this is an advanced keeper’s project, not a beginner purchase.

    11. Ocellated Puffer

    • Scientific name: Tetraodon cutcutia / Leiodon cutcutia
    • Origin: South and Southeast Asia
    • Adult size: 6 inches (15 cm)
    • Minimum tank size: 20 gallons (76 L)
    • Temperament: Aggressive
    • Community safe?: No
    • pH: 6.5-7.5
    • Water temperature: 75-82°F (24-28°C)

    A well-planted, cave-rich setup with moderate water flow suits the ocellated puffer best. Sandy substrate mimics its natural habitat. Species-only. Occasionally available through specialty importers.

    12. Arrowhead Puffer

    • Scientific name: Tetraodon suvattii
    • Common names: Pignose puffer
    • Origin: Laos and Thailand
    • Adult size: 6 inches (15 cm)
    • Minimum tank size: 20 gallons (76 L)
    • Temperament: Aggressive
    • Community safe?: No
    • pH: 6.5-7.5
    • Water temperature: 72-79°F (22-26°C)

    Bottom ambush predator. Inactive most of the time, active at feeding. Needs 2-3 inches (5-7 cm) of fine substrate to bury into. Will eat any fish that fits in its mouth and bite chunks from fish that do not. Species-only tank, no exceptions.

    13. Crested Puffer

    • Scientific name: Carinotetraodon lorteti
    • Common names: Red-eyed puffer
    • Origin: Southeast Asia
    • Adult size: 2 inches (5 cm)
    • Minimum tank size: 15 gallons (57 L)
    • Temperament: Semi-aggressive
    • Community safe?: No
    • pH: 5.0-7.5
    • Water temperature: 75-82°F (24-28°C)

    Similar in appearance to the red-tailed dwarf but grows slightly larger. Dense planting and hardscape are required if keeping more than one. A small group in a large, well-structured tank can work, but monitor carefully for aggression.

    Tank Setup

    Puffers are messy feeders. Protein-rich meaty food breaks down fast and drives ammonia up quickly. Strong filtration is not optional. An oversized filter rated for double the tank volume is the right starting point, not the maximum.

    Freshwater puffers are sensitive to nitrates despite their reputation for hardiness. Keep nitrates under 20 ppm (mg/L). That means regular water changes, quality filtration, and not overfeeding. Test your water at first to establish a baseline, then build a maintenance schedule around what you find.

    All freshwater puffer species are tropical fish and need a heater. Some species from fast-flowing rivers appreciate powerheads for added water movement, but always include sheltered areas where the fish can rest without fighting current.

    Live plants help water quality and add visual breaks in the tank. Large puffers are hard on plants, so stick with tough, fast-growing species: Java fern, Java fern, anacharis, hornwort. Do not plant a prize aquascape and then add a fahaka to it.

    Feeding

    Pufferfish will not eat flake food. Do not try to make them. Their diet is meaty, hard-shelled, and live or frozen. This is the part that ends puffer ownership for people who did not research before buying.

    The beak grows continuously throughout the fish’s life. Hard foods grind it down naturally. Without them, the beak overrows and the fish starves even when food is available. A puffer with an overgrown beak needs veterinary attention. It happens. It is preventable with the right diet.

    Primary food options: live snails (ramshorn, bladder, pond snails), frozen bloodworms, frozen brine shrimp, ghost shrimp, mosquito larvae, freeze-dried krill. Larger species need whole clams, mussels, and crab legs from the grocery store seafood section. Freeze the shellfish before feeding to kill pathogens.

    Feed two to three times daily and remove uneaten food within a few hours. Puffers produce significant waste and spoiling food compounds the problem fast.

    Tank Mates

    The honest answer is that most puffers do not have tank mates. They are species-only fish. The question is not “what can I add?” but “will I accept a species-only setup?”

    If you insist on a community attempt, the South American puffer is your best option. Keep it in a group of six or more with fast-moving, similarly-sized fish. Danios, larger tetras, and similarly active species. No slow fish, no long-finned fish, no invertebrates.

    For all other puffers, the answer is almost always no. A larger fish that can defend itself might survive short-term, but puffers are persistent biters. Even large cichlids end up stressed and fin-damaged in close quarters with an aggressive puffer.

    Health and Disease

    Most puffer health problems trace back to three causes: poor water quality, wrong diet, and stress from inappropriate tank mates or stocking density.

    Many freshwater puffers available at retail are wild-caught. Wild-caught fish frequently arrive with internal parasites. Quarantine is not optional with these fish. Run a standard quarantine period of at least two weeks, and seriously consider a prophylactic deworming treatment before introducing them to a display tank.

    Never add puffers to an uncycled tank. Ammonia and nitrite spikes hit them hard. Stress from water quality issues opens the door to bacterial infections, ich, and other opportunistic diseases quickly.

    FAQs

    Are freshwater puffers easy to keep?

    Not for beginners. They have specialized diets (live and frozen meaty food, hard-shelled items), they do not belong in community tanks, and they require excellent water quality. Aquarists with a few years of experience who are willing to set up species-only tanks and maintain snail cultures will find them very manageable. First-time fish keepers should not start here.

    Which freshwater puffer is best for beginners?

    The pea puffer is the most accessible entry point. It is true freshwater, small enough for a 5-gallon (19 L) tank, widely available, and inexpensive. The South American puffer is the best choice if you want something that might work in a community setting.

    Can freshwater puffers live with other fish?

    Most cannot, or should not. The South American puffer is the exception when kept in a group with fast-moving community fish. All other species on this list are better off in species-only setups. Their fin-nipping instinct is strong enough that community attempts usually end badly.

    What is the difference between a freshwater and brackish puffer?

    True freshwater species complete their entire life cycle in fresh water and do not need salt. Brackish species like the green spotted puffer tolerate fresh water as juveniles but require specific gravity of 1.005-1.010 as adults. Keeping a brackish species in permanent fresh water shortens its lifespan significantly.

    Why do puffer fish need hard-shelled food?

    Puffer fish have fused teeth that form a beak-like structure that grows continuously. Hard foods like snails and shellfish grind down the beak through normal use. Without hard food, the beak overrows and the fish loses the ability to eat, even if food is present. This is the most common preventable cause of puffer death in captivity.

    Closing Thoughts

    Freshwater puffers are some of the most personality-rich fish you can keep. They recognize you, they react to you, and there is nothing generic about a tank built around them. But they are also demanding in ways that catch people off guard. The diet commitment is real. The species-only requirement eliminates most of the easy community tank setups. And the larger species represent multi-decade commitments to fish that will outgrow most rooms.

    Go in with your eyes open and you will love them. Go in expecting a community tank centerpiece with no behavior changes required and you will be disappointed, and your other fish will pay for it.

    Mark’s Pick

    For most hobbyists making their first move into puffers, the pea puffer is where I would start. Set up a 10-gallon (38 L) planted tank, get a snail culture running before you buy the fish, and spend a few months learning how puffers behave and what they actually eat. Then decide if you want to scale up to a South American puffer community or go all-in on a species tank with a fahaka. The pea puffer gives you the full puffer experience at a scale that is actually manageable.

    Where to Buy Freshwater Puffer Fish

    Pea puffers and South American puffers are increasingly available online, which is often a better option than local fish stores for niche species. Online sellers ship directly from their own systems, and the fish arrive in better condition than most retail store stock. For larger or rarer species, specialty importers are the most reliable source.

    • Flip Aquatics – Quality freshwater fish, reliable shipping, good stock of dwarf species
    • Dan’s Fish – Healthy fish, good availability on puffers and specialty freshwater species

    📚 Want to learn more? This article is part of our complete Freshwater Fish Guide. Your ultimate resource for freshwater species, care tips, tank setup, and more.

  • Hatchetfish Care Guide: The Surface-Dwelling Jumpers That Fill Your Tank’s Top Level

    Hatchetfish Care Guide: The Surface-Dwelling Jumpers That Fill Your Tank’s Top Level

    Table of Contents

    Hatchetfish are the only freshwater fish that can genuinely fly. They launch themselves out of the water using powerful pectoral muscles, and they will do it right out of your tank if you give them the chance. A tight-fitting lid is not optional. It is the single non-negotiable requirement for keeping any hatchetfish species.

    Hatchetfish fly. Your lid is either tight or your fish is on the floor. There is no in-between.

    The Reality of Keeping Hatchetfish

    The jumping is not a behavior problem. It is instinct. In the wild, hatchetfish jump to escape predators and catch flying insects. In your tank, any sudden disturbance, a loud noise, a fast-moving hand near the glass, or a startled tank mate can trigger a jump. A lid is not optional. It is the most critical piece of equipment for this species.

    They are strict surface dwellers. Hatchetfish spend virtually all their time at the surface. They do not explore the middle or bottom of the tank. This makes them perfect for filling the top layer of a community setup, but it also means surface agitation from filters or airstones stresses them. They need calm water.

    They are more sensitive than most tetras. Hatchetfish are wild-caught more often than tank-bred, and they are more sensitive to water quality fluctuations than common community tetras. Stable parameters and gentle acclimation are essential. They are not a good choice for new or unstable tanks.

    Biggest Mistake New Owners Make

    Not having a proper lid. I cannot stress this enough. Hatchetfish will find gaps you did not know existed. Every opening around filter intakes, heater cords, or airline tubing needs to be sealed.

    Expert Take (Mark Valderrama, AquariumStoreDepot)
    Hatchetfish are one of the most fascinating freshwater species you can keep, but they demand a lid and calm conditions. When properly housed, they are the best surface-dwelling fish in the hobby by a wide margin.

    Key Takeaways

    • Hatchetfish get their name from their unique ‘Hatchet-like’ body shape.
    • It is a peaceful community fish that enjoys the company of at least 6 to 12 fish. 
    • They are the only true flying fish with large pectoral muscles that work like wings.
    • Many species of hatchetfish have bioluminescence with their own pattern of lights in order to communicate, attract prey, and camouflage. 

    An Overview Of The Fish Species

    Scientific NameGasteropelecus sternicla
    Common NamesRiver hatchetfish, common hatchetfish, silver hatchetfish
    FamilyGasteropelecidae
    OriginSouth America in Brazil and in the southern tributaries of the Amazon river basin
    DietOmnivore
    Care LevelModerate
    ActivityModerate
    Lifespan5 years
    TemperamentPeaceful 
    Tank LevelSurface dwellers
    Minimum Tank Size20 gallons
    Temperature Range72. 81° F
    Water Hardness2 – 15 dGH
    pH Range6.0. 7.5
    Filtration/Water FlowModerate
    Water TypeFreshwater
    BreedingEgg Layer
    Difficulty to BreedDifficult
    CompatibilityCommunity tanks
    OK, for Planted Tanks?Yes

    Classification

    OrderCharaciformes
    FamilyGasteropelecidae
    GenusCarnegiella / Gasteropelecus / Thoracocharax
    SpeciesMultiple species across three genera
    ASD Difficulty Rating: Intermediate | 6/10
    Hatchetfish are surface specialists with two non-negotiable requirements: a tight-fitting lid and soft, slightly acidic water. They are not difficult once you understand those needs, but they expose sloppy setups fast.

    Origin And Habitat

    Linnaeus in 1758 discovered the common hatchetfish; Gasteropelecus sternicla species. They originate in South America in Brazil and mainly in south and central America (Southern tributaries of the Amazon river basin). Common hatchetfish are also found in the small streams of Guyana and Surinam with dense vegetation (floating aquatic plants). 

    In their natural habitat, they are found in regions that are densely populated with aquatic plants. In the wild, the common hatchetfish are mostly found at the water surface and retreat occasionally when threatened or in danger. Mostly, you will find these fish species flying from the surface of the water, trying to catch flying insects.

    Fun Fact: Certain hatchetfish species participate in the largest migration in the world, migrating from 1,500 meters (about 5,000 feet) of depth to shallower seas. They gather with their twilight zone neighbors in the shadows to eat at the zooplankton feast, where they consume crustaceans, copepods, floating fish larvae, mosquito larvae, and ostracods. But as soon as the sun comes up, it's time to head back to the twilight zone. The hatchetfish has no control over when the axe will fall.

    The Definition Of Hatchetfish 

    The common hatchetfish species go by their scientific name, Gasteropelecus sternicla. They are known for their unique but strange-looking body that looks like the head of the hatchet. Hence, the term Gasteropelecus in their scientific name also refers to a hatched-shaped belly. 

    One of the leading reasons for their popularity is not their particular body shape, but their ability to leap from the water’s surface and fly through the air. River hatchetfish or common hatchetfish can also flap their large pectoral fins and catch flying insects. Thus, in the fish-keeping world, the hatchetfish bag the title of the only true flying fish. 

    Species of hatchetfish are able to fly more than 4 feet and move their pectoral fins like a bird’s wings in the air. As astounding as it sounds, the flying power of hatchetfish is a problem in hatchetfish aquariums as this ability also develops the need for a tight-fitting lid.

    Characteristics 

    The common hatchetfish are small, shiny silverfish with a hatchet-shaped bodies. They are tropical fish found in mostly warm temperature regions at a depth of around 200 to 1000 meters.

    Hatchetfish have deep bodies that are flattened from side to side. The tails are slender with big eyes. The common hatchetfish are often mistaken as their cousin relative, the silver hatchetfish. However, the common hatchetfish species are slightly larger than the Silver hatchetfish.

    What Is The Average Size Of These Tropical Fish Species?

    The average size of Hatchetfish is around 2.6 inches in captivity. However, the wild-caught fish is a bit smaller in size, around 1 1/2 inches. 

    How Long Do They Live?

    On average, hatchetfish lives for about 3 to 5 years in captivity. Since they are social and peaceful fish, you should to keep a group of 8 or more fish to improve their life quality. 

    What Are The Different Types?

    There are five different species of hatchetfish found in the aquarium hobby.

    Silver

    Silver Hatchetfish

    The most common type of Hatchetfish is the silver hatchetfish. They have silver bodies that seem almost transparent and a unique ‘hatchet-like’ body shape. The silver hatchetfish are great swimmers and are known for their ability to jump out of the aquarium. Therefore, always choose a tight-fitting lid for your aquarium. 

    Blackwing 

    The Blackwing hatchetfish are larger than the other species of hatchetfish. They grow around 3 inches in length with darker bodies adorned with metallic green or blue hues on the fins. Temperament-wise, they are semi-aggressive fish but generally peaceful fish, ideal for a community tank.

    Marbled

    The marbled hatchetfish are somewhat similar in appearance to the popular silver hatchetfish. However, they have smaller bodies and marble-like mottled coloration on their bodies. Marbled hatchetfish are schooling fish that enjoys the company of other species of hatchetfish. Thus, I advise keeping a group of 8 or more to keep your fish healthy and thriving. 

    Marbled Hatchetfish

    Carnation

    Carnation hatchetfish are the species that experienced fishkeepers would enjoy. That’s because they are sensitive to water quality and conditions, so little attention is required. Size-wise, they are a smaller species with a pink or peach-colored body. 

    Pygmy

    The smallest species of hatchetfish are the pygmy hatchetfish (video source). They grow only up to 1 inch in length. Also, they have silver bodies with a black stripe along their dorsal fin. 

    Common Hatchetfish Care

    The freshwater Hatchetfish is a particularly hardy fish. However, it is still recommended for aquarists with some previous fish-keeping experience. That’s because they are active fish and need lots of free swimming space. Also, they are highly prone to fish diseases such as Ich, especially when introduced to a new tank. 

    Therefore, you should to quarantine the new fish before introducing them into the community tank.

    Are they hard to care for?

    No, they are not difficult to keep and care for. However, you need a certain level of expertise in keeping their water conditions optimal. Species of hatchetfish are sensitive to water conditions. Therefore, a little maintenance goes a long way. It’s crucial to maintain your tank and clean all the decomposing organic matter, check water quality regularly, and clean fish waste. 

    These toxins pollute the fish tank and affect the wellness of your fish. Therefore, to cater to these water conditions, I recommend replacing the water on a daily basis. If your tank is densely populated with a group of fish, at least 50% of the water should be replaced every week. 

    Aquarium Setup 

    The natural habitat of hatchetfish undergoes rainy season and floods. So, thankfully, they can survive in a wide range of pH, GH, and other water parameters. Hatchetfish are tropical freshwater fish that appreciates water temperature between 75. 80°F. 

    Since they are schooling fish, they thrive in a group of 6 to 12 or more. I recommend keeping at least 12 fish in the community tank because they feel safer and more comfortable. Though hatchetfish are active fish, but not exceptional. 

    Therefore, the minimum tank size should be 20 gallons or larger. Regardless of the tank size, install a tight-fitting lid or hood because you will find them jumping out of the aquarium often. Besides, if you have installed a filter, heater, or pumps, you are sure to cover any openings with aquarium-safe materials such as craft mesh, etc.

    Tank Size

    Hatchetfish are not super active fish but they do require free swimming space, considering the fact that they thrive in a community of at least six fish. 

    The minimum tank size should be 20 gallonsI recommend a long tank with sufficient surface space as they will jump out of the water. 

    Water Parameters

    Even though hatchetfish are moderately hardy aquarium fish. There are specific water parameters to maintain for them to thrive in your aquarium. 

    • The ideal water temperature should be between 75. 80°F. 
    • Hatchetfish prefers slightly acidic water with a pH between 6.0 to 7.5 and it’s crucial to maintain the ideal pH range because changes in pH lead to stressful behavior in the fish.
    • They thrive in slightly hard water so the water hardness should be between 2 – 15 dGH.
    • Ammonia and nitrites are toxic for hatchetfish and harmful to their overall health. Therefore, install filters to avoid ammonia and nitrite buildup and test your water daily. 
    • Nitrates: Hatchetfish can survive low levels of nitrates, but high levels can be detrimental to their health. Therefore, consider keeping nitrate levels as low as possible. The ideal range is less than 20 ppm.
    • Water movement: Hatchetfish are slow-moving fish that mostly swims at the top of the aquarium. They prefer slow-moving water and gentle current. The use of a filter is recommended, and aeration should be minimized to keep them healthy. 
    Hard Rule: Your tank must have a tight-fitting lid before you add hatchetfish. No gaps, no open spaces around filter tubes or heater cords. Hatchetfish are powerful jumpers and will clear a gap without warning. Out of water, they die within minutes. This is not an exaggeration.

    Filtration And Aeration 

    Hatchetfish are highly sensitive to ammonia and nitrites. Therefore, installing a quality filter is important. 

    If you have a small tank of around 15 gallons, Hang-on-back filters are easy to install and maintain, and they provide excellent filtration. However, if you have a larger aquarium of around 20 gallons or more, I recommend installing canister filters as they are more powerful than HOB and ideal for larger aquariums.

    For hatchetfish tanks, I advise installing sponge filters as they don’t produce strong currents and are gentle. 

    No matter what type of filter you use, it’s crucial to clean and maintain them daily for efficient results.

    For aeration, it’s important to avoid strong currents in the tank as they can lead to stressful behavior. The use of air stones and air pumps is recommended for tank aeration. 

    Lighting

    Hatchetfish occupies the surface of the water tank and does best in tanks with moderate to low lighting. Therefore, the ideal lighting for hatchetfish is moderate to low, depending on various factors, including plants, and species of hatchetfish. Low light aquarium plants are most ideal for them.

    Aquatic Plants and Decorations

    Aquatic plants and decorations are important for a hatchetfish tank because it provides hiding places and a fun natural environment for your fish. That’s because their natural habitat is laden with hiding places and vegetation. Also, plants improve the quality of water by absorbing excess nutrients and promoting a healthy balance of microorganisms in the water.

    Some of the best aquatic plants for your hatchetfish are:

    1. Floating plants: Amazon Frogbit, water lettuce, Salvinia, etc.
    2. Mosses: Java Moss, Christmas Moss, etc
    3. Other plants: Java Fern, Anubias, Cryptocoryne, etc.

    For decorations, you should to add driftwood, rocks, and stones to create a natural environment for your fish. 

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    Tank Maintenance

    Freshwater hatchetfish are simple to keep and take care of. To maintain their water in the best possible condition, you need to have a particular level of competence. Because hatchetfish species are sensitive to water quality, a little upkeep may go a long way. Maintaining your tank is essential, as is cleaning out all of the fish waste, nitrate, nitrite, and phosphate buildup. 

    These chemicals contaminate the fish tank and harm your fish’s health. I advise refilling the water every day in order to address these water conditions. If you have a lot of fish in your tank, you should change the water every week by at least 50%. 

    Substrate

    Hatchetfish are surface dwellers. Thus, choosing a substrate for their tank is not challenging. However, you need to consider the size of the tank, and the type of plants in your aquarium before choosing the right substrate.

    Fortunately, you can keep any substrate you want as long as it suffices your tank’s needs. Fine sand is the most popular option for substrate because it does no harm to your fish’s fins. Gravel and Aqua soil are also common substrate options.

    What People Get Wrong

    The biggest mistake is an unsecured lid. Hatchetfish are surface fish that startle easily, and a startled hatchetfish jumps. Any gap around a filter, heater cable, or return tube is a death trap. Before you buy hatchetfish, seal every opening in your lid. This is not optional.

    Second mistake: adding them to a new or uncycled tank. Hatchetfish are more sensitive to water quality than their appearance suggests. Ammonia or nitrite spikes will kill them quickly. They belong in an established tank with stable parameters, not a cycling setup.

    Third: keeping them without surface cover. Floating plants , water lettuce, frogbit, or even hornwort at the surface , give hatchetfish the security they need. In a bare tank under bright overhead lighting, they hide at the edges and stress out. A floating plant layer keeps them active and visible.

    Community Tank Mates 

    Hatchetfish are peaceful fish that are relatively shy. Therefore, they should be kept with compatible fish that is not hostile or aggressive towards them. Since they are schooling fish, always keep them in a group of 6 or more.

    The bigger the school, the happier the fish. Some of the suitable tank mates for hatchetfish are:

    1. Tetras
    2. Rasboras
    3. Corydoras
    4. Gouramis
    5. Dwarf cichlids
    6. Dwarf shrimps
    7. Other hatchetfish

    What Do They Eat?

    Hatchetfish are carnivorous fish that mostly feed on crustaceans and insects in their natural habitat. They have their mouths on the top of their bodies so they prefer eating surface foods such as fruit flies, mosquito larvae, and small vinegar flies.

    In captivity, they accept live food, fish flakes, flake foods, and frozen foods. Basically, any food that is on the surface of the water. It’s recommended to feed them protein-rich food such as brine shrimp or blood worms, daphnia every day, etc. You can also feed them vegetables occasionally such as blanched spinach, zucchini, and cucumber.

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    What Is The Feeding Frequency? 

    You should feed them several feedings a day. Ideally three times a day. However, make sure not to overfeed your hatchetfish otherwise, it will create health issues or water quality problems.

    Breeding

    Hatchetfish are egg layers. But in captivity, the common hatchetfish has failed to breed. However, the marbled hatchetfish are hardy and easy to breed as compared to other species.

    Overall, the breeding of hatchetfish is challenging, but with the right conditions, it’s certainly possible.

    Choose A Breeding Tank

    Hatchetfish need a spacious tank with lots of hiding places, floating plants, and other] vegetation. Adjust the lighting to mimic daylight or use some natural sunlight to escalate the process. The breeding tank should have ideal water parameters with a pH range of around 6.0 to 7.5

    Feed The Breeding Fish 

    Feed your breeder fish with high-quality protein-rich food that includes live or frozen foods such as daphnia, mosquito larvae, blood worms, and brine shrimp. This will help in the breeding and spawning process. Once they are well-fed and nourished, introduce the pair into the breeding tank.

    The Perfect Timing 

    Hatchetfish breed in the early morning hours, therefore, mimic the natural environment of fish in the breeding tank. Gradually increase the light intensity and then reduce it in the evening to trigger the breeding behavior. 

    Keep An Eye On The Floating Plants

    You will find the fish eggs mostly on the underside of floating plants or on the tank glass. Remove the adult fish as soon as they lay eggs as the adult fish might end up eating eggs. The fish eggs hatch in around 3 days. The baby fish need to be fed small amounts of brine shrimp with other small live food at least thrice a day.

    Fish Diseases

    Want an easy community fish? This is not it. Want a species that rewards dedicated care? The Hatchetfish delivers if you put in the work.

    The hatchetfish are susceptible to Ich. Therefore, it is crucial to quarantine the new fish in a separate tank before introducing it to the community tank. However, if you don’t keep a check on water conditions, there are higher chances of your fish developing diseases.

    Like most fish, these freshwater fish are subject to many other fish diseases, such as skin flukes, parasitic infections, and fungal or bacterial infections. Despite being hardy, these fish species still get diseases. Thus, whatever you add to your aquarium. new fish, tank decorations, aquatic plants, substrate, properly clean and quarantine everything before moving to the main tank.

    What It Is Actually Like Living With Hatchetfish

    The Hatchetfish is more active and aware of its surroundings than most people expect. In a properly set up tank, it shows behaviors that generic care guides never mention.

    Feeding becomes a routine both you and the fish look forward to. The Hatchetfish learns your schedule and responds to your presence near the tank within the first few weeks.

    Maintenance is consistent, not difficult. Regular water changes and parameter monitoring become second nature. The fish rewards consistent care with better color, more activity, and visible health.

    Over time, you notice personality traits unique to your individual fish. Some are bold explorers. Others are cautious observers. That individual personality is what turns casual fishkeeping into a genuine hobby.

    FAQs

    How Many Should I Keep?

    Hatchetfish enjoys being in a school of at least 6 to 12 and even more.

    What Fish Can Live With Them?

    They are peaceful fish that are also shy. Therefore, they should be kept with compatible fish that is not hostile or aggressive towards them. The ideal tank mates for hatchetfish are:

    Tetras
    Rasboras
    Corydoras
    Gouramis
    Dwarf cichlids
    Dwarf shrimps
    Other hatchetfish

    Are They Easy To Keep?

    Yes, they are hardy and easy to keep. However, they are not recommended for beginners as they demand particular water conditions and tank maintenance.

    What Do They Eat?

    They are carnivorous that need a diet rich in protein. Frozen foods, live food, frozen fried foods, meaty foods, brine shrimp, tubifex, fruit flies, and daphnia are excellent sources of nutrition for Hatchetfish.

    Are They Aggressive?

    No, they are very peaceful and non-territorial. In fact, they are a great choice for a community tank. However, if they are kept in small tanks or containers where they feel threatened, they might become semi-aggressive toward other hatchetfish.

    Are They Hardy?

    Yes, they are moderately hardy fish recommended for aquarists with some prior experience.

    Is the Hatchetfish Right for You?

    Good Fit If:

    • You want a surface-dwelling schooling fish that does not compete with mid or bottom-level species
    • You have a securely sealed lid and are committed to keeping it sealed at all times
    • You can provide live or frozen foods (small insects, daphnia, blackworms) to supplement dry feeding

    Avoid If:

    • You cannot guarantee a sealed, escape-proof lid – hatchetfish jump reflexively and exit any uncovered opening
    • You want a visible, active display fish – hatchetfish hover at the surface and rarely move into the main tank body
    • You keep a group under 8 – small schools become skittish and escape behavior becomes more frequent

    Final Thoughts

    Hatchetfish, like their unique name, are interesting and intriguing fish with unusual bodies, shimmery scales, and peaceful nature. The fish species, despite their many different types, share similar characteristics and behavior. Hence, ideal for community tanks and a treat to watch and care for.

    Check out our tetra tier list video where we rank the most popular tetras in the hobby, including the hatchetfish:


    This article is part of our Tetras: Complete A-Z Species Directory. Visit the hub page to explore care guides for all tetra species we cover.
  • 15 Best Platy Tank Mates for a Peaceful Community Tank

    15 Best Platy Tank Mates for a Peaceful Community Tank

    Platies are one of the best beginner fish in the hobby: peaceful, colorful, hardy, and genuinely fun to keep. But here’s the part nobody talks about upfront: if you have males and females together, you will have fry. Constantly. The tank mates you choose determine whether your platy setup stays enjoyable or turns into an overstocked mess fast.

    The fish is easy. The breeding is what separates people who enjoy platies from people who get overwhelmed by them.

    I’ve worked with platies for decades, both personally and through the stores I managed. They’re as forgiving as freshwater fish get, but “forgiving” doesn’t mean “no plan needed.” The right tank mates make a platy tank thrive. The wrong ones (or no plan for the fry) will have you dealing with problems inside six months.

    Key Takeaways

    • Platies are hardy, peaceful community fish, but livebearer breeding reality means you need a fry plan before you add tank mates
    • Best tank mates are peaceful fish sharing neutral to slightly alkaline water (pH 7.0–8.0) and similar temperature ranges (72–79°F / 22–26°C)
    • Keep at least 2–3 females per male platy to prevent harassment; this applies to all livebearer mixes including mollies and guppies
    • Avoid fin-nippers, aggressive cichlids, and large predatory fish that can swallow platy fry or stress adults

    Caring For Your Platies: A Brief Recap

    Before picking tank mates, you need to know what platies actually need. The basics set the boundaries for everything else in the tank.

    Types of Platies

    There are two species in the hobby: the Southern Platy (Xiphophorus maculatus) and the Variable Platy (X. variatus). Decades of selective breeding have produced a huge variety of color forms, including:

    • Variegated platy
    • Mickey Mouse platy
    • Swordtail platy
    • High fin platy
    • Wagtail platy
    • Balloon platy
    Golden Wagtail Platy

    The good news: all these varieties share the same care requirements.

    Aquarium Size & Parameters

    Platies come from the warm waters of Mexico, Central America, and northern South America. They need water temperatures of 68–79°F (20–26°C), so most setups need an aquarium heater.

    Target parameters:

    • pH: 7.0–8.2
    • Water hardness: 10–30 dGH
    • Minimum tank size: 15 gallons (57 L) for platies alone; 30 gallons (114 L) for a community setup

    A 15-gallon (57 L) works for a small group of platies. For a mixed community, 30 gallons (114 L) minimum, and bigger is always better once fry start surviving.

    Maintenance

    Platies need a quality filter and regular partial water changes. Get yourself a water test kit and use it. There’s no substitute for knowing what’s actually in your water.

    Breeding Platies

    Put males and females together and they will breed. That’s not a maybe. It’s a certainty. In a community tank, most fry get picked off by other fish, including the platies themselves, and the population stays manageable on its own. If you actually want to raise fry, pull the pregnant female into a separate tank before she drops. Otherwise, let the community handle it and don’t stress about it. Most people do just fine without intervention.

    Feeding

    Platies eat almost anything: high-quality flake or micro-pellet food as a daily staple, supplemented with frozen or live foods a few times a week. Most tank mates in this guide thrive on the same diet. I’ll call out exceptions where they exist.

    What People Get Wrong About Platy Tank Mates

    The number-one mistake I see is picking tank mates based purely on temperament, checking the “peaceful” box and calling it done. Temperament is only half the equation. The bigger issue is the livebearer breeding dynamic.

    In my experience, the male-to-female ratio issue catches more people off guard than any tank mate compatibility question. Put platies with guppies and mollies without managing male-to-female ratios and you don’t get a peaceful community: you get constant harassment. I’ve watched this play out at the stores I managed: customers would come back two months later wondering why their females were dying, and the answer was almost always the same ratio problem. Females get run ragged. Within a few weeks, you’ll notice a female hiding, losing color, refusing food. That’s stress, and it progresses to death if nothing changes.

    The second mistake is ignoring pH. Platies want neutral to slightly alkaline water: 7.0 to 8.0. That’s a different world from discus, altum angels, or wild-caught tetras that need soft, acidic conditions. I’ve seen hobbyists try to find a “compromise” parameter that keeps both groups alive. It doesn’t work. One group is always running suboptimal, and that shows up in color, behavior, and lifespan. Pick tank mates that actually live in the same water, not ones you’re hoping will adapt.

    Biggest Mistake Platy Keepers Make

    Mixing male-heavy livebearer tanks without a ratio plan. After 25+ years in this hobby and time running fish retail, I’ve seen this wreck otherwise great community setups more times than I can count. One male platy relentlessly chasing two females in a 20-gallon (76 L) sounds harmless. It isn’t. The females are constantly evading, constantly stressed, constantly burning energy. Over weeks, immune function drops, they become prone to disease, and they stop eating well. You’ll lose fish that look physically healthy and never connect the dots back to the male-female ratio. Keep at least two to three females for every male, regardless of tank size.

    Top 15 Tank Mates for Platy Fish

    Every species here shares platy water chemistry: neutral to slightly alkaline pH, moderate hardness, and a temperature range in the low-to-mid 70s°F (22–24°C). That’s the filter that matters most. Compatibility starts with parameters, not just personality.

    Expert Take

    After 25+ years in this hobby (and years managing freshwater retail), platies are the livebearer I’d recommend to anyone starting out. They’re peaceful, hardy, adaptable, and they don’t nip fins. I’ve built platy communities in my own tanks and in every store I managed. These are the tank mates that actually held up long-term. The main challenge with tank mates isn’t compatibility: it’s fry management. In my experience with platies, the male-to-female ratio is the single thing most people get wrong. Platies breed constantly, and if you’re putting them in a community tank, you need a plan for the fry. Other fish will eat most of them. That’s actually fine for population control. What breaks a platy tank is the ratio, not the tank mates themselves. — Mark Valderrama, AquariumStoreDepot

    Quick-Reference Comparison Table

    Species Adult Size Min Tank Ease Compatibility
    Molly Fish 3–5 in (7.6–12.7 cm) 30 gal (114 L) 8/10 High
    Guppy Fish 1.5–2.5 in (3.8–6.4 cm) 10 gal (38 L) 8/10 High
    Honey Gourami 2 in (5 cm) 10 gal (38 L) 8/10 High
    Betta Fish 2.5 in (6.4 cm) 10 gal (38 L) 6/10 Conditional
    Zebra Danio 2 in (5 cm) 20 gal (76 L) 9/10 High
    Cory Catfish 1–3 in (2.5–7.6 cm) 20 gal (76 L) 9/10 High
    Bristlenose Pleco 5–6 in (12.7–15.2 cm) 29 gal (110 L) 8/10 High
    Harlequin Rasbora 1.75 in (4.4 cm) 20 gal (76 L) 9/10 High
    Otocinclus 1.75 in (4.4 cm) 20 gal (76 L) 7/10 High
    Boeseman’s Rainbowfish 4 in (10 cm) 30 gal (114 L) 7/10 High
    White Cloud Mountain Minnow 1.5 in (3.8 cm) 15 gal (57 L) 8/10 Conditional
    Neon Tetra 1 in (2.5 cm) 15 gal (57 L) 8/10 High
    Ember Tetra 0.75 in (1.9 cm) 10 gal (38 L) 8/10 High
    Angelfish 6 in (15 cm) 29 gal (110 L) 6/10 Conditional
    Hatchetfish 1.25 in (3.2 cm) 20 gal (76 L) 6/10 High

    1. Molly Fish

    Ease: 8/10 Natural livebearer tankmate. Manage the male-to-female ratio.

    How Do Molly Fish Look Like
    • Size: 3–5 in (7.6–12.7 cm)
    • Tank size: 30 gal (114 L)
    • Scientific name: Poecilia latipinna & P. sphenops
    • Origin: North & South America
    • Swimming level: Middle and upper levels
    • pH: 7.0–8.5
    • Water temperature: 70–79°F (21–26°C)
    • School size: 3+

    Mollies and platies are a natural pairing: both livebearers, both adaptable, both peaceful. Mollies top out at 5 inches (12.7 cm) and need at least 30 gallons (114 L). One thing to watch: if you’re keeping both species, the male-to-female ratio issue doubles. Male mollies will pursue female platies and vice versa. Keep the whole livebearer population skewed female: two to three females per male across all species combined.

    2. Guppy Fish

    Ease: 8/10 Excellent match. A mixed livebearer tank needs a numbers plan.

    • Size: 1.5–2.5 in (3.8–6.4 cm)
    • Tank size: 10 gal (38 L)
    • Scientific name: Poecilia reticulata
    • Origin: South America & Caribbean
    • Swimming level: All levels
    • pH: 7.0–8.5
    • Water temperature: 64–82°F (18–28°C)
    • School size: 3+

    Guppies are another live-bearing fish that thrives alongside platies. They’re smaller (topping out around 2.5 inches / 6.4 cm) and even more colorful in the males. There are many guppy varieties to choose from. Guppy fry get eaten by most community fish, which helps keep the population in check without any intervention.

    3. Honey Gourami

    Ease: 8/10 Peaceful, works perfectly with platies, no livebearer complications.

  • The honey gourami is a quiet, unassuming fish that works beautifully in a platy community. At 2 inches (5 cm), it doesn’t compete for space, doesn’t harass other fish, and its golden coloration stands out alongside the varied platy color forms. A related species of the betta fish, it uses a labyrinth organ to breathe atmospheric air, which means it tolerates slightly lower oxygen levels better than most tank mates.

    4. Betta Fish

    Ease: 6/10 Works with careful planning. Not a casual add.

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    Bettas can work with platies, but they’re not a casual add. A male betta in a platy community needs a tank of at least 20 gallons (76 L), not the 5-gallon solo minimum, with plenty of sight breaks. Choose a betta whose color differs from your platies, and skip long-finned platy varieties. A betta that mistakes its platies for rival fish will attack. The honey gourami is an easier option if you want the gourami look without the aggression risk. Choose a betta if you want a centerpiece fish with personality; choose the honey gourami if you want zero drama.

    5. Zebra Danio

    Ease: 9/10 One of the most reliable platy tank mates in the hobby.

    What Does A Zebra Danio Look Like

    Zebra danios are fast, hardy, and completely unbothered by platies. They school actively in the mid-water and upper column, which creates movement in a tank dominated by platies hovering in the middle. Keep at least 6. Danios in small groups get nippy. In a proper school of 8 or more, they’re model citizens. These fish handle a wide range of water conditions and bounce back from beginner mistakes better than almost anything else on this list.

    Hard Rule: Keep at least 2–3 female platies per male, across all livebearers in the tank combined. A single female relentlessly chased by one or more males will be harassed to exhaustion and death over weeks. The ratio applies whether you have 1 species or 4. This is not optional.

    6. Cory Catfish

    Ease: 9/10 The best bottom-dweller for a platy community. No competition.

    What Does A Cory Catfish Look Like

    Corydoras are my default recommendation for any platy community. They stay on the bottom, clean up whatever falls to the substrate, and have zero interest in bothering anyone. Most cory species want the same neutral to slightly alkaline water as platies: bronze cories (C. aeneus) and peppered cories (C. paleatus) are the most forgiving and easiest to find. Keep at least 6. I’ve kept groups of 4 and they’re fine, but 6 or more and you’ll see a completely different level of activity. They move together, they feed together, and they’re genuinely fun to watch work a tank.

    7. Bristlenose Pleco

    Ease: 8/10 Reliable algae control. Stays small. Needs driftwood.

    The bristlenose pleco is the pleco for community tanks. Unlike common plecos that hit 18 inches (45 cm) and outgrow everything, bristlenoses stay under 6 inches (15 cm) and do a real job on algae. Keep one per tank. Two males will fight over territory. Give it driftwood to graze on and a cave to claim, and it will mostly disappear during the day and work the tank at night.

    8. Harlequin Rasbora

    Ease: 9/10 One of the best schooling fish for a platy community.

    Harlequin rasboras are a standout schooling fish for this type of community. The black triangular patch on the rear half of the body gives them a distinctive look, and a tight school of 10 or more moving together is genuinely impressive. Their lower pH preference (down to 6.0) works fine alongside platies at 7.0–7.5, and the overlap zone is comfortable for both. Avoid very small rasbora species like chili rasboras: at under 1 inch (2.5 cm), they get outcompeted at feeding time and stressed by the activity level of larger platies.

    9. Otocinclus

    Ease: 7/10 Best algae grazer for the community, but needs an established tank.

    Otos are the algae grazers you want when the tank has a real algae coating to maintain. Don’t add them to a new setup; they need an established tank with a consistent algae food source or they’ll starve. Keep 4–6 together; they do better in small groups than alone. They’re completely vegetarian, which means they’re safe with platy fry. They’re one of the few tank mates you can say that about.

    10. Boeseman’s Rainbowfish

    Ease: 7/10 Striking display fish that matches platy water parameters well.

    Boesemani Rainbowfish

    Boeseman’s rainbowfish are visually striking: neon blue on the front half, vivid orange-yellow on the back. They prefer the same neutral to slightly alkaline water as platies, and that overlap makes the chemistry side easy. You need at least 6 of them and 30 gallons (114 L) of space. These are active mid-water fish that need room to move. They’re one of the larger options on this list, which adds visual impact to a platy community without adding aggression. Browse the full range of rainbowfish species if you want to explore other options in this family.

    11. White Cloud Mountain Minnow

    Ease: 8/10 Excellent match at the cooler end of the platy temperature range.

    White cloud mountain minnows are graceful, peaceful schooling fish that work well with platies, with one temperature caveat. White clouds are cold-water fish that prefer 60–72°F (16–22°C). Platies can drop to 68°F (20°C), so the overlap window is 68–72°F (20–22°C). Keep the tank at that range and both species do fine. Push it warmer for the platies and the minnows will struggle. This is a conditional compatibility: make the temperature decision first, then commit.

    12. Neon Tetra

    Ease: 8/10 The classic platy community addition. Reliable and visually striking.

    Neon tetras have earned their reputation. They’re peaceful, visually dramatic in a school, and completely compatible with platies at the water parameter level. Keep 10 or more for the full schooling display. Groups under 6 tend to scatter and look sparse. The blue and red neon stripe under good lighting alongside the color variety of platies is one of the better beginner community combinations you can build.

    13. Ember Tetra

    Ease: 8/10 Small, colorful, and peaceful. Great for smaller platy setups.

    Ember tetras are small (under an inch / 2.5 cm), but in a school of 10 or more, their burnt-orange coloration against green plants is striking. They’re best in a planted platy tank where there’s some cover, since they can get outcompeted at feeding time in busy tanks. Their pH preference (down to 5.5) runs slightly softer than ideal platy water, but at 7.0 the overlap is fine. A good choice for anyone with a 20-gallon (76 L) platy setup who wants a schooling fish without needing a large tank.

    14. Angelfish

    Ease: 6/10 Works with adult platies. Will eat fry and small juveniles.

    Koi Angelfish

    Angelfish are one of the hobby’s great centerpiece fish. The catch: they’re large enough to swallow platy fry and juveniles whole. Keep angels with fully adult platies only. The temperature ranges are compatible: both like the mid-to-upper 70s°F (24–27°C), but a 55-gallon (208 L) tank is much more practical than the 29-gallon minimum when combining angels with an active livebearer community. Choose angelfish if you want a dramatic showpiece; go with honey gouramis if you want compatibility without size complications.

    15. Hatchetfish

    Ease: 6/10 Unique surface dweller, but sensitive and escape-prone.

    Marble Hatchet Fish

    Hatchetfish are unlike anything else on this list. They live exclusively at the surface, don’t compete for mid-water space with platies, and their deep-bodied silhouette is genuinely unusual. The trade-off: they jump. A tight-fitting lid is not optional. It’s essential. They’re also more sensitive to water quality than most fish here, so they’re better suited to hobbyists who already have a stable, mature tank. Keep 6 or more; they’re social and stay calmer in a proper school.

    Community Aquarium Setup Guidelines

    Found the right combination? Run through this before you buy.

    The Aquarium

    A 30-gallon (114 L) tank is the practical minimum for a platy community. A 20-gallon (76 L) works only if you’re keeping just two small species in modest numbers. Every tank needs a secure lid. Most fish on this list jump, and platies themselves have been known to launch themselves when startled.

    Essential Hardware

    A quality aquarium filter is non-negotiable. Hang-on-back filters work well for tanks up to 40 gallons (151 L). For larger setups or more bioload, consider a canister filter.

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    You’ll also need a heater, as almost everything on this list wants water in the low-to-mid 70s°F (22–24°C).

    Substrate & Decorations

    Sand or fine gravel works for the bottom layer. Choose smooth substrate if you’re keeping corydoras: their sensitive barbels need it. Driftwood and rocks add natural structure. Live plants (Anubias, Java fern, hornwort) are the right call for a platy community. They improve water quality, reduce stress, and give fry somewhere to hide if you’re not using a breeding tank.

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    Mark’s Pick: For a classic platy community, I’d go with corydoras on the bottom, a school of harlequin rasboras or neon tetras in the mid-water, and a bristlenose pleco for algae duty. All three tolerate the same neutral to slightly alkaline water as platies, none of them cause conflict, and the result is a tank with activity at every level. That’s the setup I’ve recommended for years, and it still holds up.

    Platy Tank Mates FAQs

    What fish can live with platies?

    Mollies, guppies, corydoras, honey gouramis, zebra danios, harlequin rasboras, neon tetras, bristlenose plecos, and otocinclus are all reliable platy tank mates. The common thread: peaceful temperament and neutral to slightly alkaline water (pH 7.0–8.0). Avoid aggressive species, fin-nippers, and any fish large enough to swallow adult platies.

    How many platy tank mates can I keep together?

    In a properly sized tank, you can mix several species comfortably. A 40-gallon (151 L) tank can support a group of 6–8 platies, a school of 8–10 rasboras, and 6 corydoras without crowding. The limiting factor is bioload and livebearer population growth over time. Plan for fry production when calculating how many fish you’re actually adding to the tank.

    Are platies good community fish?

    Yes. Platies are some of the best community fish available for a beginner setup. They’re peaceful, adaptable, colorful, and hardy. The one thing that catches people off guard is the breeding rate. If you have males and females, you’ll have fry. Plan for that and the rest is straightforward.

    Do platies breed in a community tank?

    Yes, continuously. Females give birth to live fry roughly every 4–6 weeks. In a community tank, most fry get eaten by other fish, which naturally limits population growth. If you want to raise fry, move the pregnant female to a separate tank before she gives birth. If you don’t want fry at all, keep only males or only females, but be aware that an all-male platy tank produces chasing behavior between males.

    Can platies live with angelfish?

    Adult platies: yes. Platy fry and juveniles: no. Angelfish are large enough to eat anything that fits in their mouth, and platy fry definitely qualify. If you want angelfish in a platy community, keep only fully grown adult platies, use a 55-gallon (208 L) or larger tank, and accept that fry won’t survive.

    What fish should you NOT keep with platies?

    Avoid large cichlids (Oscars, Jack Dempseys, Green Terrors), aggressive fin-nippers like tiger barbs in small groups, and any fish requiring very soft or acidic water below pH 6.5. Large predatory fish will eat platies. Fin-nippers will shred their fins. And fish that need very different water chemistry than platies will never thrive in the same tank. One group or the other will be compromised.

    Should You Build a Platy Community Tank?

    Good Fit If:

    Avoid If:

    Final Thoughts

    Platies are a gateway fish: genuinely easy to keep, endlessly varied in color, and compatible with most of what you’d want in a community tank. The livebearer breeding reality is not a problem if you go in with a plan. Know your male-to-female ratio, choose tank mates from the same water chemistry world, and decide early whether you want to manage fry or let the tank handle it naturally.

    Here’s what I tell people after 25 years in this hobby: a well-planned platy community is one of the most satisfying tanks you can build. A poorly planned one (wrong ratios, wrong chemistry, no fry strategy) becomes a frustrating mess within months. The fish aren’t the problem. The planning is. Get the planning right and everything else follows.

    What’s your favorite platy combination? Drop it in the comments. And if you found this useful, subscribe to our YouTube Channel for more freshwater content from someone who’s actually been doing this for decades.


    📘 Want to learn more? This article is part of our complete Freshwater Fish Guide: your ultimate resource for freshwater species, care tips, tank setup, and more.

  • Apistogramma Care Guide: Types, Breeding, and What They Actually Need to Thrive

    Apistogramma Care Guide: Types, Breeding, and What They Actually Need to Thrive

    Table of Contents

    Apistogrammas are the crown jewels of the dwarf cichlid world, and they are not nearly as beginner friendly as pet stores suggest. Every species needs soft, acidic water, a mature tank, and careful attention to territory. I have kept over a dozen apisto species and the universal truth is this: get the water chemistry right and apistos are incredible. Get it wrong and you are buying replacements every few months. There is no middle ground.

    What Most Care Guides Get Wrong About Apistogramma

    Most guides give you a cookie-cutter care sheet for Apistogramma without mentioning the nuances. After 25+ years in this hobby, I have seen how small details in tank setup and maintenance make a real difference in long-term health. Another thing guides gloss over is temperament. Apistogramma are often described with a single label, but their behavior shifts depending on tank size, tank mates, and territory. You need to plan for the worst-case scenario, not the best. Group size is another area where most guides fall short. Saying ‘keep them in groups’ is not enough. The difference between keeping 3 and keeping 8 or more is night and day when it comes to coloration, confidence, and natural behavior.

    The Reality of Keeping Apistogramma

    Apistos are incredible fish, but they have a reputation for being finicky that is entirely earned. Here is what that actually means for your setup.

    Water chemistry is non-negotiable. Most Apistogramma species need a pH between 5.5 and 6.5, very low hardness, and warm temperatures between 78 and 84F. If your tap water is hard and alkaline, you need RO water or significant buffering. There is no shortcut here.

    Males are territorial. A male apisto will claim a section of your tank and defend it vigorously. In a small tank, that can mean every other bottom-dwelling fish gets chased relentlessly. You need sight-line breaks, caves, and enough floor space for territories.

    Species identification is a nightmare. There are over 400 described and undescribed Apistogramma species. Misidentified fish are common, especially from importers. Hybrids are also widespread. If species purity matters to you, buy from specialists.

    Females turn into different fish when breeding. A female apisto guarding eggs transforms from a shy, retiring fish into a tiny tank boss. She will attack males, tank mates, and anything that comes near her cave. This behavior is normal and expected.

    Biggest Mistake New Apistogramma Owners Make

    Keeping them in hard, alkaline water and wondering why they get sick and die. Apistos are blackwater fish. They need soft, acidic conditions. If your tap water has a pH of 7.8, you cannot keep apistos without modifying it. End of discussion.

    Expert Take (Mark Valderrama, AquariumStoreDepot)

    Start with Apistogramma cacatuoides or A. Borellii. These two species are the hardiest in the genus and will tolerate a wider range of conditions than most. Once you have success with those, branch out into the more demanding species.

    ASD Difficulty Rating: Tier 2 – Intermediate

    Apistogramma is a large genus of dwarf cichlids from South America, most requiring soft, acidic water and cave-based territories. Care difficulty varies by species – some are beginner-accessible, others are specialist-level.

    Key Takeaways

    • Apistogramma genus normally reach about 3 inches in size making them great for a 20 gallon freshwater aquarium
    • They come in a plethora of colors and have over 100 sub-species to choose from
    • They are mostly bottom-dwelling fish that do great with upper column schooling fish like tetras and pencil fish
    • Many variants are easy enough to keep even for beginner aquarist

    An Overview of the Species

    Scientific Name Apistogramma
    Common Names Dwarf Cichlid
    Family Cichlidae
    Origin Vietnam, Laos, Cambodia
    Diet South America
    Care Level Moderate
    Activity High
    Lifespan 5 to 10 years
    Temperament Semi aggressive
    Tank Level Bottom
    Minimum Tank Size 20 gallons
    Temperature Range 72. 86° F
    Water Hardness 2. 15 dH
    pH Range 6.0. 7.0
    Filtration/Water Flow Low
    Water Type Freshwater
    Breeding Egg Layer
    Difficulty to Breed Varies
    Compatibility Community tanks
    OK, for Planted Tanks? Yes

    Classification

    Order Cichliformes
    Family Cichlidae
    Subfamily Geophaginae
    Genus Apistogramma
    Species Over 90 described species (Regan, 1913)

    Appearance

    One of the appeals of keeping Apistogramma is all of the variations of colors that is found in these dwarf cichlids. Every color from varying shades of reds, blues, and even golds is found, making them truly a joy to keep and admire.

    Apistos Cichlid

    Most Apistogramma also have the typical cichlid profile of being slim and long with a thick black stripe that runs the entire body length to their tail fins.

    Males tend to always be the most beautiful of the Apistogramma species, while females tend to have more muted color palettes. There are a few female varieties that buck this trend, but overall it’s the males that stand out.

    Some females do become much more vibrant during the breeding season, demonstrating that color may still play a role in mating for the males as well as the females. But there’s not much scientific evidence proving this theory yet.

    Types of Apistogramma Species

    A. Cacatuoides

    Dwarf Cockatoo Cichlids (Apistogramma Cacatuoides) are one of the most commonly kept Apistogramma due to the ease they is bred in captivity and the ‘Cockatoo’ appearance of their prominent dorsal fins.

    Apistogramma cacatuoides

    On males, apistogramma cacatuoides dorsal fin is almost as large as their entire body and is often speckled with bright red dots with streaks of yellow and black underneath. Apistogramma cacatuoides bodies are a muted yellow and sport a horizontal black line down the length of their body from head to tail.

    The females are much less vibrant than the males, as is common with cichlids. She, too, has a thick black stripe that goes from head to tail, but her body is more silver, and her fins are much smaller and don’t include the ‘cockatoo cichlid’ appearance that male apistogramma cacatuoides do.

    They are easy to care for and breed and make great additions to any freshwater tank.

    A. Agassizii

    Agassiz’s Dwarf Cichlids are more territorial and originate in Brazil, but their variety of colors and small size still make them a favorite among aquarists everywhere.

    Agassizii

    The males look more like the normal cichlid as far as shape, and include a range of color patterns including red, blue, silver, yellow, gold and orange. The most commonly kept Agassiz’s Dwarf Cichlid specimens are the yellow finned variant with a thick black stripe running the entire length of its body.

    These little fish only reach around three inches which makes them perfect for smaller tanks. They’re also considered community fish which means they is kept with other types of freshwater life, but just make sure they are the same size or larger as cichlids readily eat smaller fish of any species.

    A. Borellii

    Umbrella Cichlids have an iridescent blue-violet body with yellow tails, fins and faces making them a very uniquely colored apisto species. 

    Usually a female umbrella cichlid is drab and void of vibrancy both in captivity and in their natural habitat. But the female apistogramma borellii is unique in this as they are just as beautiful to look at as the males are boasting different hues of blue for their bodies with a red face and almost transparent yellow fins (video source).

    The Umbrella Cichlid can reach just a tad over three inches with the females being a bit smaller overall.

    They prefer densely planted aquariums with many places to hide and is easily spooked. They can also be territorial and semi aggressive so it’s best to keep one male apistogramma borellii with at least four to seven females in order to keep the peace.

    Being apistogramma borellii it’s a good idea not to keep smaller or fragile fish in the same tank set up. They will eat other fish! But fish at least the same size or larger are okay, and being a bit aggressive is acceptable too.

    A. Macmasteri

    Red Neck cichlids are known for their bright red and blue facial coloration and originate from the meta river system in Columbia. These rivers are often sandy with little vegetation, something to know when you’re setting up your tank for these.

    Macmasteri

    Red Necks are small and don’t reach three inches full-grown. And the females are even smaller. This makes them easy to keep in a smaller tank of 20 gallons or more. Just be sure to have some places to hide, like a clay pot or two and a few pieces of driftwood.

    These are active and playful fish that like some open space to swim around in. They’re peaceful and do well with others, but during mating season, you can run into aggressive behavior problems.

    So if you do plan to breed Red Necks, it’s best to place the breeding pair in a separate tank during breeding season if you have a community tank. Pencils, tetras and other calm schooling fish are the best sort of tank mates if you want to keep these in a larger set up.

    A. Hongsloi

    Hongslo’s dwarf cichlids are another variety of Colombian dwarf cichlids that, in the wild, are lightly colored in ‘boring’ tannish and white. But the strain that’s kept in tanks today is a brightly colored red variety that is the result of selective breeding and can only be found in captivity.

    Hongsloi

    The domesticated variety has the common cichlid shaped slim silver body with bright red edgings on the lower half and under their eye. Their face and ‘neck’ are yellow and fins are a transparent silverish purple making them a joy to look at.

    These dwarf cichlids are easy to keep and are social and tolerate other species of calm fish in community tanks. They don’t really require any special care and their tanks is bare sandy gravel with a few pieces of driftwood placed to make a few small cave like structures.

    Overall this is a great beginner fish if you want to start keeping dwarf cichlids.

    A. Viejita

    Viejita Rednecks aren’t as common as the other Red Neck cichlids are, but that doesn’t mean they are any less beautiful to look at.

    Viejita

    Coming in under three inches, these small nano fish are playful and clam and boast bright reds and radiant oranges. And like most cichlids they have a thick black stripe running the entire length of their body.

    Another easy fish to both keep and breed, like the Hongslo’s dwarf cichlids, they are a great beginner-friendly cichlid to start with. Fairly hardy, they like a densely planted aquarium with plenty of hiding places.

    A. Baenschi

    Apistogramma baenschi are brilliant looking with a metallic sky blue wash covering the tail end of its body while the head half is washed in yellows. Its transparent tail is edged with black then bright red or orange making this baenschi a true stand out.

    But what really separates them is the enormous fin extensions on their dorsal fin rays that make them look similar to a salt water Rooster Fish. Between their color patterns and long fin extensions, these are one of the most beautiful of the dwarf cichlids.

    They come from Peru and only grow to under three inches. They’re also calm and do well in heavily planted tanks that host other non-cichlid calm schooling fish like tetras or rasboras.

    A. Elizabethae

    One of the hardier species of the genus, Apistogramma Elizabethae is one of the rarest dwarf cichlids in the aquarium trade and hails from rivers in Brazil.

    These simply colored fish are a blueish gray with more vibrant blues at the edges of it transparent fins separated by a thick black stripe that runs halfway through its entire length. The underpart is both orange starting at the head that slowly progresses to a bright yellow. Small flecks of an iridescent blue can also been seen in the face of the males.

    These social nano fish reach lengths of two inches and is kept with other non-cichlids peacefully. But they do require a densely planted tank with rocks and driftwood and low lighting to really thrive.

    Although rare, they are a good for beginners and do well under most circumstances. Single specimens is kept in aquariums as small as ten gallons, but a twenty gallon tank or larger is required for any more than two.

    A. Trifasciata

    The Three-Striped Dwarf Cichlid is found in the sandy bottoms of the rivers of Paraguay and only grow to one to one and a half inches long making it one of the smallest dwarf cichlids on our list.

    Trifasciata, like the Apistogramma Baenschi I discussed above, slightly resemble a salt water Rooster Fish with their large fin extensions on their dorsal fin rays that traditionally include iridescent blues and oranges making them quite a site to look at.

    Their silver looking bodies are topped of with yellow running along the top of its back and the typical thick black stripe running through the center from head to its tail.

    As with most cichlids, the females are much less colorful and dramatic other than their vibrant blue fins.

    Although these are easy to keep, keep in mind males of this species often become aggressive towards each other, especially during mating. It’s best to keep one male with many females if you’re looking to keep a few of these in your tank.

    How Big Do They Get?

    Being a ‘Dwarf’ species of cichlids, these little guys pretty much never get to much more than three inches long although there are a very few that can grow as large as six inches making them the largest south american dwarf cichlids.

    And some can be as small as two inches when fully grown. This makes them perfect for smaller freshwater aquariums and play a large part in their popularity. It’s also important to note that the males are again, almost always larger than the females. This can help when you’re sexing in order to breed them.

    How Long Do They Live?

    Most dwarf cichlids live between three to five years in captivity. Their lifespan primarily depends on the quality of the main tank set up and how well the hobbyist can maintain their water.

    A few of the reasons Apistogramma has shorter lifespans includes;

    ·        Dirty Water

    ·        Ph too high or low

    ·        Keeping many males in the same tank

    ·        Keeping inappropriate tank mates that stress Apistogramma

    ·        Under or over feeding

    ·        Water temperature range too high or low

    These are just a few of the more common mistakes hobbyist make keeping dwarf cichlids. It’s important to remember that your fish are living creatures and should be treated as such.

    Take care of them and do some research on where they come from and how they live in their natural habitats. This information will go a long way in understanding proper tank set up and feeding.

    Dwarf Cichlids Behavior & Temperament

    Surprisingly, most species of Apistogramma are calm, peaceful fish and often make good tank mates, even in community tanks. And although they is shy, as long as they have a few nooks and crannies to hide when they feel threatened or stressed, they can thrive in most tanks.

    The only problem with most cichlids, regardless of size or where they come from, is their aggressive behavior during mating. Some will literally fight each other to the death.

    So it’s extremely important to always look to see if your choice needs to have a harem of females per male in order to keep aggression to a minimum.

    Most Apistogramma also enjoys schooling. In the wild, they is found in school sizes of two to ten with one male and many females. So if your tank is large enough, take advantage of this and let them swim around in impressive-looking groups.

    Are They Hard to Keep?

    Most species of Apistogramma are quite easy to keep and thrive in many types of freshwater fish tanks.

    Of course, it’s always best if you can match their natural habitats as closely as possible when it comes to pH levels, water temperature and quality, and their natural surroundings as far as substrates and flora. 

    But most of these dwarf cichlids are actually resilient and can survive in an array of water conditions. But of course, unfavorable conditions while being able to sustain your fish, most definitely play a role in limiting their lifespan.

    But read on to find out exactly what you do need to be doing and how to set up everything so you can have a Apistogramma tank to be proud of.

    Aquarium Setup

    Your aquarium set up will depend on the species of apistogramma you decide to keep. Some Apistogramma like sandy substrate bottoms to feed off, while other require a lot of live plants and other vegetation, rocks and bits of wood and plant matter like Indian almond leaves. Read through our section above on what each sub-species requires to be happy.

    What Size Tank Do They Need?

    The saying ‘bigger is better’ is true when it comes to tank sizes. Just think if you were a goldfish stuck in a tiny bowl and not allowed to swim around like fish are supposed to do. How happy would you be?

    But of course we can’t all have 300 gallon tanks, nor do you need to for these apistogramma.

    The minimum tank size for Apistogramma should be a twenty gallon tank. And this is if you only have one or two to house plus a few tetras or one of the other many species of schooling fish to keep them company.

    The one caveat worth noting here is the Apistogramma Elizabethae which doesn’t seem to mind being in smaller shallower tanks, as long as it has room to swim lengthwise.

    But otherwise, if you’re new to the hobby and setting up your first tank, start out with a 20 gallon tank.

    Water Parameters (Tank Conditions)

    Water is the most important factor in any set up and it’s also what you’ll struggle with the entire time you have your aquarium. But since Apistogramma are fresh water fish, it’s not as difficult to get it right as some other set ups are.

    Like most aquarium life, Apistogramma need certain water parameters in order to stay healthy and thrive. Deviate from them and you are putting the health of your fish at risk.

    Being from South America it isn’t hard to imagine that they need warm water to live. The perfect temperature is somewhere between 72. 86 Degrees Fahrenheit, and if the tank retains anything less than 60 Degrees for any extended amount of time can easily kill most Apistogramma. This includes the temperature of the water, even new water, that you are adding when doing your water maintenance routine

    So always pay attention to your tanks temperature!

    And as far as pH goes, try to stay in the 6.0 to 7.0 range for most species. But again, please look at each individual cichlid’s specific requirements to be sure you’re going for the correct pH.

    Quick Water Parameter Guide

    ·        Temperature: 72. 86 Degrees Fahrenheit

    ·        pH: 6.0. 7.0

    ·        TDS: 100. 200 PPM

    Filtration and Aeration

    Filtration has a lot to do with the amount of aquatic life and what else is in the tank and the tank’s water capacity. The more fish you have, the more waste needs to be removed. The same goes for live plants and substrates where microorganisms can end up growing.

    For Apistogramma the perfect set up would be to have both a mechanical and biological filter for your tank. Good aquarium filters will have different stages. The mechanical filter will filter large particles of debris and uneaten food. Whereas the biological filter will allow aerobic, nitrifying bacteria to grow that break down waste and other toxic compounds.

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    If you are on a serious budget and are starting small, a large sponge filter is used, it’s just not the optimal filter for the job. 

    Depending on which Apistogramma you have, it’s best to keep your filters running slowly as many of these come from slow moving rivers or the edges of lakes where the water is more still. Replicating their natural water movements is another way to keep your apistogramma happy without really needing to do much.

    Lighting

    Most Apistogramma are more comfortable with medium to low light conditions in your tank. For many variants, live plants that grow and offer shade in the tank and deflect direct light are a great addition and can help with tank stability as well.

    Try using LED lighting for your freshwater fish aquariums as they offer the best full spectrum lighting and don’t heat up like other types of lighting does. They’re also more energy efficient.

    And to make things easier on yourself, use a timer so your live plants get the exact amount of lighting they need. For most situations this is somewhere between 8 to 10 hours.

    Aquarium Plants and Decorations

    Aquarium plants and decorations are necessary for most Apistogramma aquariums and help keep your pet’s stress levels to a minimum and offer them a relatively stress free life. Most cichlids are actually shy and need hiding spaces when they are frightened or overwhelmed by tank mates.

    Clay pots and driftwood make great cover and are easy enough to source and use. Just place a clay pot or two in your tank surrounded by a few small pieces of driftwood and that should be enough ‘cover’.

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    But don’t forget the live plants! Or think it’s to difficult to grow them, it’s not.

    Plants help keep your pH stable and help to naturally improve water quality by truing waste into oxygen. They can also create canopies to fragment direct lighting.

    Here are a few great choices when it comes to plants for a cichlid aquarium;

    Water sprite is by far the best plant to have in a cichlid tank. This versatile plant is grown either rooted or you can let it just float creating a natural canvas that helps block direct light.

    Java Moss is next on the list as a fantastic plant for cichlids. You only need a small piece to get started and it will slowly grow out from there. Java moss is also a great water filtration plant and adds a lot of ‘naturalness’ to any sort of Apistogramma tank set up.

    Java Fern is another plant that is easily available and looks great. Once your plant starts growing you can cut of the rhizomes to make more plants. And this is a hardy plant that fish don’t eat, so it’ll last forever if you take care of them.

    Substrate

    When it comes to the substrate, you want to mimic your apistogrammas’ natural environment as much as possible. Most dwarf cichlids live in places that have either mud or sand bottoms and it will depend on which variants you choose to keep to know which to use.

    One note, try keeping same species together! You don’t want one variety that prefers sand substrate tanks mixed with ones that require mud and decaying plant matter. Plan your main tank ahead and you’ll have happier fish.

    Tank Maintenance

    Water

    In the wild, dwarf cichlids are mostly from rivers and streams which means they have a constant flow of fresh water to live in. You should do all you can to give them the same clean, fresh water in their tank.

    That means have a water changing routine is paramount. Clean water really does make all the difference, and weekly water changes can make all the difference in your fish’s health.

    You should be changing around 50 % of your tank water every 3 to 4 days for the absolute best results. You can even go more often if you have the time. The cleaner your water is, the better your aquarium will do.

    Vacuuming

    Vacuuming your tank is another necessity if you have a sandy bottom tank. Debris will accumulate on the floor and can cause havoc when it comes to pH levels and cleanliness.

    Once a week is fine for most tanks to be vacuumed. And the cheap hand-squeezable option is good enough for most 20 gallon tanks. Just be aware of plant roots when vacuuming and make sure there are no fry that is vacuumed up by mistake.

    Community Tank Mates

    Believe it or not, dwarf cichlids enjoy having other fish around. A few appropriate apistogramma tank mates seems to make them feel calmer and less stressed. When they have the right tanks mates, you’ll notice they’ll come out more often and be more inquisitive about their surrounding and even you.

    But what are the best tank mates to keep with dwarf cichlids?

    Tetras and pencilfish are great picks for all of the cichlid species we’ve gone over here. They all swim in the upper water column and are not aggressive at all. In addition they’re big enough that your cichlids won’t eat them.

    And they look great in school sizes of ten or more. A school of tetras along with one or two cichlids can all be kept together in the same 20 gallon tank or larger with no crowding.

    A few more great tanks mates include:

    Food and Diet

    When it comes to feeding your Apistogramma, remember most are omnivores and require both plant based foods and live or frozen foods like shrimp in order to have a balanced diet.

    Luckily it’s pretty easy to feed your them a proper diet. Some commercial fish food and frozen or even dried brine shrimp are enough to keep your fish happy and well fed.

    Don’t just feed them once a day, or let them go without food for long periods of time. This will stress out your fish and they’ll start showing signs of sickness.

    And try to go the extra mile by adding some live food to the mix as often as possible and not just feeding them flake food. They are semi aggressive and watching them swim around devouring tiny shrimp or glass worms is a lot of fun to watch!

    What  Foods To Feed them?

    Pellet Foods

    Frozen foods: Frozen foods are the second best option as they are still healthier alternatives to dried flakes. And they come packaged so it’s also a convenient source of protein that sinks to the bottom of the tank where your fish are. The best one to get are blood worms which aren’t worms at all, but rather larvae. Small shrimp can also be found frozen, but the blood worms are still preferable over the shrimp. But they’ll do if that’s all you have.

    Prepared Foods: These types of food are obviously the easiest to feed your fish with, but aren’t enough on their own. We highly recommend that you use live foods as often as possible. But a few times a week is okay. Instead of the flakes which to much can cause inferior water quality, we prefer using pellets as a prepared food source for our cichlids. Pellet foods hold up better and are just as easily obtainable and convenient as flaked food, but cause less pollution in your community tank. Look for the sinking type for the best results.

    Brine Shrimp: The best option and most easily accessible are live shrimp. All pet stores carry these, and they’re cheap and easy to manage. Just buy a bag and drop some into the water and watch your fish go crazy hunting them all down. It’s one of my favorite things to watch!

    White Worms: White worms are another easy choice and is found in most aquarium shops. The great part about these worms is that if you have a little space, you can just raise them yourself. And they multiply quickly, so you’ll always have a supply of healthy live food available all for free.

    How Often Do I feed My Fish?

    For dwarf cichlids, once in the morning and once at night is recommended. You can also split their food up as far as feeding live foods in the morning and pellet foods at night. Just go easy on the pellet foods, maybe 2 to 3 times a week only. 

    Breeding

    Breeding Apistogramma or any bonded pair of fish for that matter is a wonder to watch and extremely rewarding experience.

    Apistogramma Nijsseni in Fish Tank

    This is definitely something for the more advanced aquarist, but there are many stories of people finding little fry in their tanks without even knowing they had breed apistos or something else.

    So with a little knowledge and luck, even the beginner hobbyist can breed many of these types of dwarf cichlid and all without a special breeding tank set up.

    Sexing

    Sexing Apistogramma on the whole is petty easy. Most males are much more colorful and larger fish than the females, especially when it comes time to breed. So just by looking at your fish you should be able to tell what’s what.

    The problem comes when they are juveniles and you’re looking to buy a breeding bonded pair. Some are extremely hard to tell apart when they’re young and it can take a very experienced hobbyist to know the difference.

    So if you’re just starting out and want a juvenile pair, it’s best to consult with someone that really knows what they’re doing.

    Feeding

    For breeding you will definitely want to be feeding your pair live foods. Brine shrimp and larvae are best with some frozen blood worms once or twice a week for added fat seem to work very well when breeding.

    The Tank Set Up

    Your Apistogramma tank set up definitely plays a role in breeding successfully. First, the water quality needs to be as close to perfect as possible. Poor water conditions stress your Apistogramma and lower any chance of successful breeding, so make sure your water pH levels are in align to the type of fish you’re going to be breeding. And some people go as far as setting up a separate breeding tank for same species fish.

    Shelter and Cover also play a major role. They are on the whole shy fish, so they need somewhere to hide out when they’re feeling stressed or overwhelmed.

    Plus they need a place to actually lay their eggs and for safety when the eggs hatch. All this particular species needs is a somewhat partially closed in space to lay their eggs in or a separate breeding tank with a bonded pair ready for breeding. A simple clay plant pot can work or some driftwood placed to create small caves or caverns also works.

    For the best results as far as survival rates for fry, use a clay flower pot in the breeding process and make the opening big enough for the female, but not the male. Believe it or not, the male can fertilize the eggs just fine from outside the pot. And he can’t eat them or the eggs.

    And for the best results, make sure the cave or crevice is always dark, especially until the fry emerge!

    Males may look like they’re being aggressive towards the female, but they are actually just showing off and trying to grab their attention, a bit like a peacock would showing off its feathers.

    How Do I Know if my Female Has Spawned?

    When she’s ready to finally spawn, most dwarf cichlid females will disappear into an enclosed space for a while. So if you notice she has been hiding for a few days, it’s a good sign that she is ready to, or already has spawned.

    What to Feed Them?

    After they first hatch, your babies will live on their egg sack for the first to 7 days. Once that is gone and they are mobile, small microfauna that are already found in most established community tanks will be enough for a few days.

    After a week to ten days, you can add a small amount of fry powder mixed with water and drop it close to the fry group using a pipet or something similar. Do this up to three times a day until they are large enough to start eating small baby brine shrimp.

    You can find specialized ‘small’ shrimp meant for specifically feeding fry at most aquarium shops or online.

    After about a week they should be big enough to start eating the normal foods you’re feeding your adult fish. This is also a good time to move them to a breeding tank if you planned to.

    FAQs

    Can they be kept in a community tank?

    Yes, dwarf cichlids actually do better in community tanks. The best fish to share a tank with are top water column schooling fish like tetras and pencilfish.

    Are They hard to keep?

    It depends on which one you want to keep. With over 100 sub-species in the cichlid family, there are a variety of levels of difficulty. But on the whole, even beginning aquarist can be successful keeping these.

    How many should be kept together?

    This depends on how large the tank is. For 20 gallon tanks it’s best to keep one to two fish, while larger tanks can hold schools of seven to ten.

    Can I keep a single species?

    Yes, it’s recommended to keep single species as mixing species can cause aggression, especially from males during breeding season.

    Are they peaceful?

    Surprisingly most dwarf cichlids are peaceful and make good companion fish. There are a few that are more semi aggressive, so it’s best to do your research before choosing the exact species to keep.

    Can you keep them in a 10 gallon tank?

    No, you shouldn’t keep these fish in 10 gallon tanks. 20 gallon tank is considered the smallest optimum set up for these as they like the bottom of the tank. And bigger is always better.

    What can you keep with them?

    The ideal community tank mates for a dwarf cichlid are upper water column schooling fish like tetras and pencilfish which both make ideal buddies. But most calm schooling fish can make good tank mates.

    How many can live together?

    It’s best to keep either single or pairs in smaller tanks. If you have a bigger tank, schools of 6 to 10 of the same species are okay, but it’s best to keep only one male and many females per tank to avoid aggression and possible death to the fighting males.

    What It Is Actually Like Living With Apistogramma

    Living with apistos is like keeping tiny, beautiful dictators. The male claims his territory and patrols it with the intensity of a fish ten times his size. He flares at anything that crosses his border, displays constantly, and puts on a color show that is hard to believe comes from a fish barely three inches long. The contrast between their small size and their enormous personality is what hooks people.

    The breeding behavior is where apistos become truly addictive. When a female turns bright yellow and starts guarding a cave, you know eggs are coming. Watching her chase the male away from her brood, herd the fry around the tank, and teach them to pick at biofilm is fascinating. It is parenting behavior that rivals anything you see in nature documentaries. Once you witness your first successful apisto spawn, you understand why people dedicate entire fish rooms to this genus.

    The downside is real. When water chemistry drifts, apistos are the first fish in the tank to show it. They fade, clamp their fins, stop eating, and hide. You test the water, find the pH crept up or the TDS climbed, and you realize this is a genus that keeps you honest. Lazy fishkeeping does not survive contact with apistogrammas.

    Hard Rule: Apistogrammas require soft, acidic water (pH 5.5–7.0, TDS under 150 ppm) to maintain color and breed. Hard water suppresses breeding and causes gradual long-term health decline.

    Is the Apistogramma Right for You?

    Good Fit If:

    • You can maintain soft, acidic water chemistry consistently
    • You want a territorial dwarf cichlid with genuine personality and visible breeding behavior
    • You have caves, coconut shells, and line-of-sight breaks for territory
    • You enjoy fish that interact with their environment and claim specific areas of the tank

    Avoid If:

    • Your tap water is hard and alkaline and you cannot soften it reliably
    • You want a peaceful community fish – pairs become aggressively territorial during spawning
    • You do not have hiding spots and territory dividers – these are non-optional for this species
    • You expect a consistent temperament year-round – breeding cycles change their behavior dramatically

    In Closing

    Apistogrammas do not adapt to your water. You adapt your water to them, or they die.

    Apistogramma species are amazing fish and a beautiful addition to any dwarf cichlid tank. These relatively small fish are a joy to watch, breed and even feed when using live foods.

    And there are plenty of color patterns and varieties to choose from, as well as levels of difficulty in keeping. So as a beginner hobbyist you can start off with an easy dwarf cichlid, then work your way up to more advanced fish keeping with rarer and more difficult specimens like a dwarf cockatoo cichlid.

    Who knows, maybe one day you’ll be an Apistogramma specialist.

  • White “Algae” in Your Aquarium: What It Actually Is and How to Get Rid of It

    White “Algae” in Your Aquarium: What It Actually Is and How to Get Rid of It

    If you’re seeing white fuzz in your tank, the most likely culprit is a benign fungus growing on new driftwood. It’s one of those things that freaks people out the first time they see it. but it’s completely harmless to fish and almost always disappears on its own within a few weeks as the wood finishes leaching. I’ve seen it in nearly every tank I’ve set up with new driftwood. Don’t panic.

    “White algae” actually covers a few different things. fungal growth, bacterial biofilm, and in some cases genuine white slime algae. Knowing which one you’re dealing with changes how you handle it. Here’s a breakdown of the causes and what to do about each.

    Key Takeaways

    • White algae isn’t actually a type of algae. Instead, it’s more likely to be a fungus.
    • This algae is most likely to appear on new driftwood and other organic aquarium additions but can be the leftovers of dead algae too.
    • There are a few ways to get read of this algae, including removing it by hand, adding different fish species and invertebrates that eat white algae, or using aquarium-safe chemicals.
    • The best way to get rid of white algae is by letting it leave on its own.

    Introduction To White Algae In Aquariums

    Everyone dreads getting green algae in their aquarium. But when you see something that appears to be white algae showing up, you might be more confused than ever.

    While algae is ugly, it’s a natural part of the ecosystem. However, we like our fish tanks to be perfect so it must go. There are a few reasons why you’re growing white algae over other green or red algae species. To get rid of white algae, you need to understand why it’s growing.

    But first, what is white algae, and how do you identify it?

    What Is It?

    To understand what white algae is, we must understand what it’s not.

    Biofilm In Aquariums

    The term white algae is a misnomer. This name comes from its plant-like appearance that covers aquarium decorations and causes hobbyists headaches. In fact, it’s more likely that white algae is a bunch of filamentous fungus-like organisms instead of true algae; white algae may also be described as white mold.

    But if it looks and acts like algae, then why isn’t it algae?

    Algae is a scientific group of photosynthetic eukaryotic organisms, or living things that have a nucleus and membrane-bound organelles they use to gather energy from the sun. There are many species of known algae with many different varieties growing in freshwater, saltwater, and brackish ecosystems.

    In nature and in the aquarium, species of algae thrive when given plenty of light, nutrients, and little competition. While unwanted in home fish tank setups, algae is a natural part of any aquatic system and aren’t inherently bad. However, it can smuggle other aquarium plants and corals, lessen light penetration, and become unsightly over time. Some algae growth is easy to control, while others quickly overtake an aquarium.

    That being said, there are only three main divisions of algae: Rhodophyta, Chlorophyta, and Heterokontophyta1. Simply put, Rhodophyta is red algae, Chlorophyta is green algae, and Heterokontophyta is largely recognized as brown algae. Though these associated colors don’t always tell the correct species of algae, you can see that there is no white algae mentioned.

    Plants get their green colors from how light interacts with their chlorophyll, or pigments of the plant; different plants produce other pigments, which can result in the red or brown coloring of algae outside of Chlorophyta.

    If the plant does not contain chlorophyll, then it will lack color and be unable to photosynthesize. While some parasitic plant species can survive without chlorophyll, white algae do not fit in this group. Thus, white algae is not considered a plant or a type of algae.

    What Is This Fuzzy Stuff In My Aquarium?

    Have you noticed a thick, white, slimy surface over your new driftwood or other aquarium decorations in your freshwater fish tank? You might be dealing with white algae.

    We established that white algae isn’t actually a type of algae and is, instead, a type of fungus. This means that it doesn’t thrive from high lighting or excess nutrients. Instead, we’ll see that it mostly originates from the availability of carbohydrates.

    Is It Harmful To Fish Or Invertebrates?

    Don’t worry, though! White algae is harmless to aquarium fish and invertebrates and is oftentimes a natural part of the tank’s changing ecosystem. The biggest problem about having white algae in your fish tank is its appearance.

    It’s important to note that there are a few other reasons why your freshwater aquarium has white fuzzy stuff growing in it. Some of which are not as safe or easy to deal with as white algae.

    Why It’s In Your Fish Tank (Causes)

    There are two main causes for white algae growing in your freshwater fish tank. Often, white algae appear around new driftwood and other organic structures placed in the aquarium. However, white algae growth may also appear to come from other aquarium plants or algae.

    New Driftwood

    One of the biggest problems new hobbyists face in their aquariums is the growth of white algae. This can happen simultaneously throughout the nitrogen cycle, with fish or without.

    A few days after adding new driftwood to the aquarium, beginner hobbyists may start to notice an unsightly white coating on their new driftwood. This progresses into a thick layer of white or transparent slime that covers the entire structure. As you can imagine, this can become concerning very quickly.

    This is perfectly natural and to be expected. In fact, there aren’t any ways to prevent it from happening. Even the most popular driftwood treatments, like leaving the pieces out in the sun, boiling them, or preserving them, will likely result in white algae growth.

    Why does white algae grow over new driftwood?

    Hobbyists must remember that everything they put into fish tanks affects the ecosystem. This is especially true when placing organic items into the aquarium, like plants, wood, or decorations, and filter media that have been transferred from another tank.

    In the case of driftwood, unfamiliar organics, , are introduced into the aquarium. The beneficial bacteria that help your fish tank run are determined to keep your aquarium safe from outside threats while also being highly attracted to carbohydrates. As a result, they start to process them and break them down. This results in the growth of white algae fungus and an unnecessary headache for hobbyists.

    Remember, a white algae invasion is not harmful to fish or invertebrates and does not immediately indicate an issue with nutrients or lighting. In about one to four weeks, all white algae should disappear from the aquarium; as quickly as it appeared, it will leave.

    Amano Shrimp Male

    In fact, it’s better to create stability during this time instead of trying to remove the white algae as quickly as possible. But if you really can’t stand the sight of it, then there are a few ways to get rid of white algae before it leaves on its own. These methods include manual removal, introducing a cleanup crew, and dosing aquarium products.

    Manual Removal

    In most cases, persistence and manual removal are the best ways to tackle any algae problem in both freshwater and saltwater aquariums. This holds true for a white algae problem–if you want to be proactive about it.

    We can’t lie. White algae is slimy and messy to remove. Because of this, we strongly recommend removing the affected driftwood from the aquarium and using a toothbrush or other scrubber to lightly detach the algae. Take a bucket of aquarium water from the fish tank to rinse off the driftwood. Remember that there are beneficial bacteria on these pieces of driftwood that you want to disturb as little as possible. Using tap water or other untreated water could kill the present bacteria, leading to even bigger problems than unwanted white algae growth.

    It is likely the white algae will grow back a couple of times more after being removed but will return as less and less every time. To help diminish returns, increase water circulation.

    If removing the white algae while still inside the main fish tank display, it’s strongly recommended to use an aquarium vacuum to help clean up the detached pieces in the water column. Unlike other algae, white algae will not self-propagate when transferred to other parts of the aquarium. Still, it’s recommended to remove any possible decaying organic matter that could lead to other issues.

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    CleanUp Crew

    If you have white algae, you’re most likely in the beginning stages of your freshwater aquarium. At some point or another, you should add a cleanup crew and algae eaters to help keep your aquarium system running.

    A cleanup crew should not be seen as a way to solve the algae problems in your tank, but rather, a natural part of the ecosystem that helps remove decaying organic material before it can start to affect water parameters. Remember that snails and shrimp will not eat fish waste! Although freshwater snails and shrimp are great at what they do, some species can reproduce very quickly and add to the overall bioload of the aquarium.

    It’s true that there are some excellent algae eaters out there, though. Some of the best algae eaters belong to the Otocinclus genus. These fish are hungry for green algae and will clean up a tank in a few days. However, their green appetite can quickly lead to food shortages, so they’re only recommended for more experienced fish keepers. They also won’t take care of a white algae bloom.

    In fact, nothing really eats white algae while it’s developing. Fish and invertebrates will pick at it as it starts to die off, though. And keep in mind that algae eaters will help clean up after the other main cause of white algae: algae die-off. But we’ll get to that in a bit.

    Aquarium Products

    We never recommend using aquarium products to treat algae problems, and especially not to get rid of white algae from the fish tank. But if you’re desperate to get your tank clean and free from white algae, then there are some readily available solutions.

    Hydrogen peroxide is a household item that is very effective at treating algae problems in saltwater and freshwater aquariums. Specifically, spot treat with a mixture of 3 ml of 3% hydrogen peroxide for every 1 gallon of water. Use a syringe or turkey baster to target the affected area while the equipment is off.

    The white algae should start to recede in the next day or so, though several treatments may be needed.

    The other readily available aquarium product is Seachem Flourish Excel. This is a bioavailable organic carbon that acts as an algaecide. The idea is that other plant species outcompete the algae with the added supplement, leaving the algae to die. While this is mainly meant for pest algae, like green hair algae, it has worked with white algae as well.

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    If planning to keep aquarium plants long-term, then Seachem Flourish Excel can be a great supplement even after your algae problem is gone.

    Doing Nothing

    Our favorite method on this list, doing nothing, is one of the best, least expensive, and least time-consuming ways to deal with white algae growth in the aquarium.

    Remember that white algae is the result of beneficial bacteria feeding on new organics, including carbohydrates, entering the ecosystem. This means that these are limited resources that will be depleted over time. In fact, most white algae growth stops in a couple of weeks, with all remaining coverage receding by the end of the month.

    To help speed things up, we recommend continuing to do regular fish tank maintenance, including using an aquarium vacuum. While in the tank, feel free to suck up any loose white algae. Try to remove food residue and other waste on top of the algae to prevent poor water quality.

    Dead Algae

    While white algae is often the result of new driftwood being placed in the tank, it’s not the only reason.

    Sometimes, pieces of dead algae turn white. This is especially true if treating excess growth with chemicals that cause sudden death. Again, there is no reason to try to treat white algae as aquarium fish, and other invertebrates will often eat whatever is leftover. If they don’t, then a well-working mechanical filtration system will clean up the rest.

    There are some occasions when white algae growth actually indicates the growth of the algae. This can be seen in calcareous species of algae, like Halimeda. Halimeda is a saltwater genus of algae that grows a hard, white skeleton underneath its fleshy green cover; when Halimeda dies, the white skeleton may also be exposed, making it the truest species of white algae on this list!

    This growth and receding effect is very similar to that seen on the white tips of corals.

    How To Treat (If It’s the Other Species)

    If the cottony growth isn’t due to driftwood or dead algae, then you might have misidentified the initial problem. While it’s unlikely that a new type of algae appears in your fish tank, stranger things have happened.

    To treat algae, we need to understand what causes it. There are three main influences of algae growth:

    1) Too much light

    2) Excess nutrients

    3) Poor water quality

    Excess Or High Lighting

    Fish tanks need a lot of light, but not too much lighting. They also need a balance of intensity, spectrum, and photoperiod. Unfortunately, algae can be caused by one or all of these factors.

    There are many aquarium lights available for purchase today. Luckily, most models can be customized for the needs of the specific tank, allowing for intensity, spectrum, and photoperiod to be manually adjusted.

    Any adjustments made should be made over long periods of time. Plants need time to adjust to sudden changes in lighting, which can slow their rates of photosynthesis and allow algae to outcompete them.

    For saltwater fish tanks, remember that white, red, and green light highly contributes to algae growth.

    Excess Nutrients

    It’s hard to tell the water and tank conditions of your system if you’re not regularly testing parameters. Even if things are okay one day, the next, you can end up with an algae bloom due to high phosphates and nitrates.

    The best way to prevent excess nutrients in your fish tank is by regularly checking water parameters and performing aquarium maintenance accordingly. Make sure that you stock your aquarium correctly without adding too many fish. Have an adequately sized aquarium filter to help process waste and create water circulation throughout the tank. Remove leftover food and waste as needed.

    Poor Water Quality

    While excess nutrients can cause poor water quality, the quality of your water starts at its source.

    Freshwater aquariums can be filled with tap water as long as algae-causing nutrients, like phosphate and nitrate, are low (and the water is treated for chlorine). Unfortunately, many beginner hobbyists do not check their source water quality, causing them to do more fish tank maintenance that only introduces more excess nutrients.

    A good aquarium setup starts with good aquarium water.

    Fungal Infections

    If you start to notice a white fuzz growing on the body or fins of your fish, you’re most likely dealing with a fungal infection. This can look like a piece of white algae that is stuck to the side of the fish but is indicative of an open wound.

    Fungal infections are often secondary infections that are due to incorrect water parameters. Improving water quality and dosing medications can lead to a full recovery and a completely healthy fish.

    Final Thoughts

    Contrary to popular belief, there is no such this as white algae. But if you see white stuff growing from a new piece of driftwood you put in the tank, you’re most likely dealing with a type of harmless fungus that will leave on its own.

    If you don’t want to wait for it to clear up over the course of a few weeks, then you may manually remove it and keep the tank clean, add algae eaters, or use chemical intervention. We think it’s best to leave it alone, though!


    🌿 Want to learn more? This article is part of our complete Planted Tank & Aquascaping Guide. your ultimate resource for aquarium plants, aquascaping styles, substrates, and more.


    🐟 Want to learn more? This article is part of our complete Aquarium Care Guide. your ultimate resource for water chemistry, maintenance, feeding, disease prevention, and everything you need for a healthy tank.

    References

  • 25 of the Most Beautiful Fish You Can Keep (Freshwater and Saltwater)

    25 of the Most Beautiful Fish You Can Keep (Freshwater and Saltwater)

    After 25+ years keeping fish across freshwater and saltwater setups, I’ve developed a strong opinion on which species are genuinely beautiful versus just hyped. This list covers 25 fish that have actually made me stop and stare. a mix of freshwater and saltwater species, from beginner-friendly to advanced-only. If you’re building a display tank or just looking for inspiration, here’s what I’d put on it.

    In this article, we’ll meet 25 of the most beautiful fish species in the world. And the best part is, all of these fish can be kept in a home aquarium! Read along to learn what makes them beautiful and also whether they are a good choice for your fish tank.

    Let’s get started!

    Key Takeaways

    • Choose your fish based on their looks, but also their needs. Each species needs different water conditions and tank sizes to stay healthy
    • There are beautiful fish for saltwater and freshwater aquariums of every size. Koi fish and goldfish can even thrive in outdoor ponds
    • The most colorful fish come from tropical zones, but there are some cold water species with great colors too

    What Makes A Fish Beautiful?

    They say beauty lies in the eye of the beholder, which means it’s up to each of us to decide what is most attractive. Fortunately, fish come in such an incredible array of shapes, sizes, and colors that there is a species to suit any taste.

    Let’s take a look at some of the features that make some fish so eye-catching.

    Shape

    Fish come in an incredible array of shapes, from the long, cylindrical eel to the square-shaped box fish. There are flat, circular fish like the Discus, diamond-shaped fish like the mono and even triangular species like the angelfish!

    Color

    There is a fish to match any color you can think of, from pitch black to pure white and everything in between. Some fish have every color of the rainbow, while others are highly reflective and iridescent.

    Patterns

    Solid-colored fish are beautiful, but these fascinating creatures also come in various patterns, including spots, stripes, and almost anything you can imagine.

    Fins

    Fish use their fins to propel them through the water and to direct their path. Selective breeding in the aquarium hobby has created beautiful fish with amazing fins that are much longer and larger, but many species have naturally strange and impressive fins. Betta fish and fancy guppies will tend to have the most unique tail varieties of the bunch.

    25 Beautiful Fish – My Top Choices

    Now it’s time to meet 25 of the world’s most beautiful fish species. Each of these fish can thrive in aquariums with the right care, but I’ve included a list of important facts to help you choose a species that will suit your aquarium and skill level.

    The video above is from our YouTube Channel. Our blog post goes into more detail. If you enjoy our content, be sure to subscribe as we post new videos every week!

    Let’s get started!

    1. Japanese Koi

    My Pick!
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    • Scientific name: Cyprinus rubrofuscus
    • Origin: Japan
    • Size: 12 to 36 inches
    • Care level: Intermediate
    • Minimum tank size: Pond
    • Special features: Diverse colors and patterns, rich history
    • Water type: Freshwater, cold water

    Japanese Koi are large pond fish that are usually kept in outdoor ponds. These colorful fish first domesticated about 2500 years ago, and they have been specifically bred for their colors and patterns for more than two centuries.

    Koi Fins

    Koi are usually marked in white, orange, and black, although red and yellow are also common colors. There are hundreds of koi varieties, and the most sought-after varieties can cost up to $1.8 million! Fortunately, you can find beautiful koi for very affordable prices.

    2. Fancy Goldfish

    • Scientific name: Carassius auratus
    • Origin: China
    • Size: 6 to 12 inches
    • Care level: Easy-Intermediate
    • Minimum tank size: 20 gallons
    • Special features: various, colors, fin types, patterns, and body shapes
    • Water type: Freshwater, cold water

    The fancy goldfish is another beautiful fish with a long history in the fishkeeping hobby. These beautiful fish were already bred and displayed a thousand years ago in China.

    Today, you can find goldfish in homes and pet stores worldwide. The most common color is bright orange, but many goldfish have black, white, red, yellow, brown, and gray markings too.

    3. Bettas

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    • Scientific name: Betta splendens
    • Origin: Thailand
    • Size: 2.5 inches
    • Care level: Easy
    • Minimum tank size: 5 gallons
    • Special features: Amazing colors, patterns, and fins
    • Water type: Freshwater, tropical

    Like Japanese koi and goldfish, betta fish have been bred into various amazing colors and patterns. However, these gorgeous fish come in a much wider range of colors.

    Betta fish are highly aggressive, which is why they are also called Siamese fighting fish. They were first kept for fighting, a cruel sport that is illegal in most parts of the world today. However, betta fish are still as popular as ever because they make amazing pets for both beginners and experienced aquarists alike.

    4. Discus

    Discus In An Aquarium
    • Scientific name: Symphysodon spp.
    • Origin: Amazon River Basin, South America
    • Size: 6 – 8 inches
    • Care level: Intermediate
    • Minimum tank size: 55 gallons
    • Special features: Electric colors and flat, disc shape
    • Water type: Freshwater, tropical

    Discus fish are stunning species from South America that have been bred to show a range of amazingly vibrant colors, including neon blue, red, green, and pearl shades.

    Discus fish are not only one of the most colorful fish in the world, but they have a really eye-catching shape too. As their name suggests, these popular freshwater aquarium fish have circular, flattened bodies.

    5. Fancy Guppies

    • Scientific name: Poecilia reticulata
    • Origin: South America
    • Size: 1.2 to 2.4 inches
    • Care level: Easy
    • Minimum tank size: 10 gallons
    • Special features: Bright colors, interesting patterns, long and colorful fins
    • Water type: Freshwater, tropical

    Guppies are one of the most popular aquarium fish, so it’s easy to forget just how beautiful these peaceful fish really are. These hardy fish are super easy to breed, and they are a wonderful first species for anyone new to the fishkeeping hobby.

    Male guppies are smaller but much more colorful than their female counterparts. These cute little fish can be pretty much any color, and they usually combine different shades and patterns, especially on their tail and dorsal fin.

    Check out my guide to 21 amazing types of guppies to learn more about this beautiful species!

    6. Freshwater Angelfish

    <a href=Altum Angelfish in Planted Tank” class=”wp-image-551860″/>
    • Scientific name: Pterophyllum spp.
    • Origin: South America
    • Size: 6 inches
    • Care level: Easy to intermediate
    • Minimum tank size: 29 gallons
    • Special features: Triangular shape and long fins
    • Water type: Freshwater, tropical

    The freshwater angelfish is one of the most elegant fish in the world. These stunning South American Cichlids don’t have the greatest range of colors, but their incredible body shape and long dorsal and anal fins have made them incredibly popular in the aquarium trade.

    There are many types of angelfish, ranging from pure white to striped and even koi-patterned varieties. These fish are great for a peaceful community tank, although they need a deep aquarium to accommodate their long fins.

    7. Cardinal Tetra

    • Scientific name: Paracheirodon axelrodi
    • Origin: South America
    • Size: 2 inches
    • Care level: Intermediate
    • Minimum tank size: 15 gallons
    • Special features: Neon blue and red horizontal stripes
    • Water type: Freshwater, tropical

    The cardinal tetra is a colorful schooling fish that looks amazing in aquarium community tanks and planted aquascapes. These fish have a prominent red stripe from their head to their tail and a neon blue stripe that glows in the water.

    Cardinal tetras are a great choice for moderately experienced aquarists looking to add some color to a community tank because they get along great with other smaller fish.

    8. Chili Rasbora

    • Scientific name: Boraras brigittae
    • Origin: Southeast Asia
    • Size: 0.7 inches
    • Care level: Easy
    • Minimum tank size: 5 gallons
    • Special features: Miniature size and bright red color with a bold horizontal stripe
    • Water type: Freshwater, tropical

    Small fish can be beautiful too, and the tiny chili rasbora is a perfect example. These tiny schooling fish are amazing to watch, especially in a heavily planted aquarium.

    The chili rasbora is also known as the mosquito rasbora, and they are one of many similar micro fish species. These little guys are great for fishkeepers with only space for a 5 to 10-gallon aquarium.

    9. Celestial Pearl Danio

    • Scientific name: Celestichthys margaritatus
    • Origin: Myanmar, Southeast Asia
    • Size: 0.8 inches
    • Care level: Intermediate
    • Minimum tank size: 10 gallons
    • Special features: Bright orange fins and ‘galaxy’ spotted body
    • Water type: Freshwater, tropical

    The Pearl Danio” data-lasso-lid=”1063218″>Pearl Danio” data-lasso-lid=”1063218″>celestial pearl danio is another beautiful nano fish that has become incredibly popular in the aquarium community. Affectionately known as the CPD, these tiny freshwater shoaling fish are peaceful creatures that thrive in well-maintained, planted tanks.

    10. Gold Barbs

    Gold Barbs Profile
    • Scientific name: Barbodes semifasciolatus
    • Origin: Southeast Asia
    • Size: 2.5 to 3 inches
    • Care level: Easy
    • Minimum tank size: 20 gallons
    • Special features: Golden body with black-spotted scales
    • Water type: Freshwater, cool/tropical

    The golden barb is a beautiful fish that has been bred to show the amazing bright colors that make them so popular today. The wild form of this species has a greener appearance but is nevertheless a gorgeous fish.

    11. Rainbowfish

    Lake Tebera Rainbowfish
    • Scientific name: Melanotaenia spp., Iriatherina spp. etc.
    • Origin: Australia, New Guinea, Madagascar
    • Size: 2 to 8 inches
    • Care level: Easy to intermediate
    • Minimum tank size: 20 to 30 gallons
    • Special features: Various bright colors and long fins
    • Water type: Freshwater, tropical

    Rainbow fish are colorful members of the Melanotaeniidae family. These popular freshwater community fish come in many shapes and sizes, from the elegant threadfin rainbowfish with its long dorsal and anal fins, to the Boeseman rainbowfish with its bright blue and yellow shades.

    12. Dwarf Gouramis

    Dwarf Gourami in Aquarium
    • Scientific name: Trichogaster lalius
    • Origin: India, Bangladesh, Pakistan
    • Size: 2.4 to 3.5 inches
    • Care level: Easy to intermediate
    • Minimum tank size: 10 gallons
    • Special features: Red and neon blue colors, long, thread-like pelvic fins
    • Water type: Freshwater, tropical

    The dwarf gourami is beautiful little fish that comes in various breeds. Flame gouramis, for example, have bright orange bodies and a neon blue dorsal fin, while the powder blue breed has an electric blue body with vertical red stripes.

    Dwarf gouramis make wonderful pets and will thrive in a planted tank of ten gallons or larger. They are peaceful creatures that can be kept with various other fish like corydoras, rasboras, barbs, and many others in a community tank.

    13. Ram Cichlids

    Blue Ram Cichlid in Planted Tank
    • Scientific name: Mikrogeophagus ramirezi
    • Origin: Amazon River Basin, South America
    • Size: 2 to 3 inches
    • Care level: Intermediate
    • Minimum tank size: 20 gallons
    • Special features: Neon colors and bold, upright fins
    • Water type: Freshwater, tropical

    German blue rams are dwarf cichlids with some of the most vibrant colors in the hobby. There are several breeds, with colors that vary from solid bright blue to specimens with a yellow body and blue spots.

    Ram cichlids are popular fish that you can find at many fish stores, but they are not ideal for beginners. These stunning fish require warmer water than many other species, and very high water quality is essential.

    14. Sailfin Molly

    Sailfin Molly in Aquarium
    • Scientific name: Poecilia latipina
    • Origin: United States and Mexico
    • Size: 4 to 5 inches
    • Care level: Easy
    • Minimum tank size: 30 gallons
    • Special features: Huge sail-like dorsal fin
    • Water type: Freshwater, brackish water

    The sailfin molly is a pretty fish with a really unusual feature. Males have huge dorsal fins, almost like the sail on a yacht! Sailfin mollies come in many colors and patterns, from pure white to black, and even bright orange.

    Sailfin mollies are a great choice if you have naturally hard water. These omnivorous fish are livebearers, so they are really easy to breed in the home aquarium.

    15. African Cichlids

    African Cichlids in a Rock Aquarium
    • Scientific name: Various
    • Origin: East Africa
    • Size: 1.5 inches to 3 feet
    • Care level: Easy to advanced
    • Minimum tank size: 55 gallons for most species
    • Special features: Amazing variety of colors, patterns, and shapes
    • Water type: Freshwater, tropical

    African Cichlids are among the most colorful freshwater fish in the world, and also some of the most beautiful. These fish range in size from tiny species that live in empty snail shells to large predators that hunt and eat other fish.

    Most African cichlid species come from the great lakes region of East Africa where they live in huge lakes like Victoria, Tanganyika, and Malawi. These stunning fish come in practically any color you can imagine, from the shocking electric yellow lab to the multi-colored peacock cichlid.

    Of course, it’s very important to research the needs of any fish before adding it to your aquarium. Most African cichlids need high-pH water to thrive, and their tank mates must be chosen carefully because these guys get very territorial.

    16. Killifish

    Gardneri Killifish in Planted Tank
    • Scientific name: Various
    • Origin: Every continent except Australia and Antarctica
    • Size: 1 to 6 inches
    • Care level: Easy
    • Minimum tank size: 10 to 20 gallons
    • Special features: Multicolored fish with interesting body shapes
    • Water type: Freshwater, tropical

    There are over a thousand killifish species on the planet, and many have spectacular colors and patterns. These small freshwater fish are adapted to live in shallow waterbodies, and some even live in puddles that dry up each year!

    Sadly, these species have a pretty short lifespan, but their eggs live on, even surviving, becoming partially dry before the next rains come.

    Many species are available in the aquarium trade, and they make fascinating pets that don’t need a large tank. The gardneri panchax, golden wonder, and clown killifish are all amazing fish that you can keep in your own tank.

    17. Flowerhorn Cichlid

    Flowerhorn Cichlid At Local Fish Store
    • Scientific name: Hybrid
    • Origin: First bred in Southeast Asia
    • Size: 12 to 16 inches
    • Care level: Intermediate
    • Minimum tank size: 75 gallons
    • Special features: Bright colors and a huge nuchal hump on the male’s forehead
    • Water type: Freshwater, tropical

    The flowerhorn cichlid is one of the strangest-looking freshwater fish in the world, but also one of the most interesting to keep. These fish are hybrids bred for the pet trade by crossing two or more Central American cichlid species.

    Flowerhorn cichlids are available in various colors and patterns, including combinations of bright red, neon blue, yellow, pink, and black. Their most distinctive feature is the huge hump on the forehead of adult males, which can grow bigger than their heads!

    Flowerhorn cichlids have big personalities, and they are very aggressive toward other fish species. These colorful freshwater fish can also be aggressive toward their owners, but they usually make very personable pets.

    18. Severum Cichlid

    Severums Fish
    • Scientific name: Heros spp.
    • Origin: Amazon River, South America
    • Size: 8 to 12 inches
    • Care level: Intermediate
    • Minimum tank size: 55 gallons
    • Special features: Variety of beautiful colors and patterns
    • Water type: Freshwater, tropical

    Severums are large but relatively peaceful South American cichlids. They have rounded bodies with big eyes and small mouths. There are a handful of severum cichlid species, and several breeds to choose from, including gold, red-spotted, red-shouldered, and turquoise color morphs.

    Choose these fish if you want a large, beautiful cichlid for a peaceful South American community tank. They can also hold their own with oscar fish and others with a more aggressive nature.

    19. Arowana

    Arowana Fish
    • Scientific name: Osteoglossum bicirrhosum
    • Origin: South America
    • Size: up to 3 feet
    • Care level: Advanced
    • Minimum tank size: 300 gallons
    • Special features: Huge, silvery scales
    • Water type: Freshwater, tropical

    The silver Arowana is an incredible tropical fish from South America that most fishkeepers can only dream about. Sure, it’s easy enough to purchase a young fish, but providing enough space for it as an adult is a challenge!

    However, let’s not take anything away from the stunning beauty of these animals. Silver Arowanas are strange and stunning to look at. Their massive scales gleam silver in good light, and their huge eyes and mouth give them a distinctive look.

    20. Clownfish

    Editor’s Choice
    Tank Raised Clownfish

    Best Choice For Reef Tanks!

    Clownfish are hardy, full of personality, and are safe for all corals. They are an icon for any saltwater tank

    Click For Best Price Purchase ORA Clownfish
    • Scientific name: Amphiprion spp., Premnas spp. etc.
    • Origin: Coral reefs in the Indo-Pacific region
    • Size: 3 to 6 inches
    • Care level: Easy
    • Minimum tank size: 20 gallons
    • Special features: bright orange color with bold black and white stripes
    • Water type: Saltwater, reef safe

    The clownfish is one of the most recognizable fish in the world, thanks to its leading role in the 2003 movie ‘Finding Nemo’. These cute fish live with sea anemones in the wild, protecting them from larger predators.

    There are many clownfish species, with colors ranging from bright yellow to maroon and even black and white. However, the ocellaris clownfish (Nemo) remains the most popular and is a great species for newcomers to the saltwater fish keeping hobby.

    These peaceful fish can be kept in nano-reef tanks as small as 20 gallons. They are easy to feed, and you can even breed them yourself.

    21. Marine Betta

    Marine Betta in Fish Tank
    • Scientific name: Calloplesiops altivelis
    • Origin: Indo-pacific Ocean
    • Size: 8 inches
    • Care level: Easy
    • Minimum tank size: 50 gallons
    • Special features: Black ground color with beautiful starry spots.
    • Water type: Saltwater, reef compatible with caution

    The marine betta, or comet as they are also known, is a fascinating and beautiful fish with extensive flowing fins. Their dark brown or black bodies are covered in small white or blue spots and they have one large spot at the base of their dorsal fins.

    This large spot has a very interesting function. Marine bettas jam their heads into holes in the reef when a predator swims by. The shape of their fins makes these clever fish look like the head of a large moray eel, and few predators will tangle with those dangerous creatures!

    Marine bettas are nocturnal fish, but they can make great a great addition to a tropical saltwater aquarium. They are peaceful fish, but they will snack on smaller fish and crustaceans.

    22. Large Marine Angelfish

    Emperor Angelfish
    • Scientific name: Pomacanthus spp.
    • Origin: Indian, Pacific, and Atlantic Oceans.
    • Size: 8 to 15 inches
    • Care level: Intermediate
    • Minimum tank size: 55 – 100 gallons
    • Special features: Bold colors and interesting body shapes
    • Water type: Saltwater, not reef safe

    Marine angelfish are some of the most popular saltwater aquarium fish in the world. These dazzling fish come from tropical and subtropical waters of the Atlantic, Indian, and Pacific Oceans. Angelfish change color as they mature, and the juveniles can be especially beautiful.

    Large marine angelfish come in various colors, often with bright yellow and blue stripes like the Emperor Angelfish. One species, the regal angelfish, takes this color scheme to an extreme level with the inclusion of a yellow tail and dark blue dorsal fin.

    23. Dwarf Angelfish

    Coral Beauty Angelfish
    • Scientific name: Centropyge spp.
    • Origin: Pacific, Indian, and Atlantic oceans
    • Size: 3 to 4 inches
    • Care level: Intermediate
    • Minimum tank size: 30 gallons
    • Special features: Amazing colors and compact size
    • Water type: Saltwater, reef compatible with caution

    Dwarf angelfish come in a staggering variety of colors, from the pitch-black midnight angelfish to the vibrant flame angelfish with its bright orange color and black vertical bars.

    These beautiful aquarium fish can be kept in tanks as small as 30 gallons, although some will do better in 55 gallons.

    24. Reef Triggerfish (Blue Throat, Niger, Crosshatch)

    Crosshatch Triggerfish in Aquarium
    • Scientific name: Odonus spp., Xanthichthys spp. etc
    • Origin: Caribbean and Indo-Pacific
    • Size: 9 to 14 inches
    • Care level: Easy to moderate
    • Minimum tank size: 125 gallons
    • Special features: Strange body shape and amazing colors
    • Water type: Saltwater

    Reef triggerfish species like the bluethroat, niger and crosshatch triggerfish make a stunning addition to larger saltwater aquariums. These beautiful fish have very odd proportions with large heads and tiny mouths.

    Their small mouths are what make these species safer for a reef tank, but bear in mind that no triggerfish is completely reef safe. These fish have sharp teeth, and they love to feed on smaller invertebrates.

    There are many amazing species, but the crosshatch triggerfish is particularly attractive with diagonal black perpendicular lines separating its scales. Each scale is further accented by a spot of blue pigment for a dazzling display.

    25. Clown Triggerfish

    Clown Triggerfish in Reef
    • Scientific name: Balistoides conspicillum
    • Origin: Tropical and subtropical waters of the Pacific and Indian Ocean
    • Size: 1′ 8″
    • Care level: Intermediate
    • Minimum tank size: 300 gallons
    • Special features: Striking black fish with round white spots and a yellow mouth
    • Water type: Saltwater

    The clown triggerfish is one of the most vibrantly marked fish in the sea. Their bold black and white coloration is accented with a yellow honeycomb pattern around the dorsal fin and a small yellow mouth filled with sharp teeth.

    The clown triggerfish is a spectacular saltwater species with an aggressive nature. These beautiful fish can be kept with some other aggressive fish species, but unlike the other triggerfish in this list, clowns are not suggested for a reef tank.

    FAQs

    Which species have pretty tails?

    There are many fresh and saltwater fish with beautiful tails, but guppy fish and betta fish probably share the first-place prize in this category. These fish have the most amazing flowing tails that really move in the water!

    Which is the most popular species on this list?

    The goldfish is the most popular pet fish in the world. These beautiful fish have been kept for centuries, and they are still just as popular as ever!

    Goldfish are not the only ultra-popular aquarium fish on this list, though. The fancy guppy and the siamese fighting fish are just as recognizable.

    What is the most unique-looking species on the list?

    The flowerhorn cichlid is probably the most unique-looking fish in our top 25. These strange hybrid fish really stand out with their huge bulging foreheads!

    Final Thoughts

    Fish are some of the most beautiful creatures on the planet, period. The variety of species available to the modern hobbyist means there’s a species out there to suit everyone’s tastes.

    Of course, there are many more than just 25 beautiful fish types worldwide, but these are certainly my favorites!

    Which fish do you think is most beautiful? Share your favorites in the comments below! Give us a sub on your YouTube Channel if you want to see some of our video content.