Tag: Freshwater Fish Profiles

Yoyo loaches are one of my go-to recommendations for anyone dealing with pest snails who also wants an interesting, active fish rather than just a control method. I’ve kept them and they’re genuinely entertaining — social, curious, and playful in a way that not many bottom dwellers are. They do get to a decent size and need a group, but in the right setup they’re one of the better loach options for a medium-to-large community tank.

Yoyo loaches get their name from their markings — the reticulated black-and-silver pattern that spells out “yoyo” on their sides as juveniles. They’re an active, social loach that does well in groups and is particularly effective for snail control; they’ll methodically work through a snail population in a way that’s almost satisfying to watch. Like most loaches, they need a soft substrate for sifting and a tight-fitting lid — they’re good jumpers. They’re also sensitive to copper-based medications, worth knowing before you treat any disease in their tank. Here’s the full care guide.

But don’t worry! Yoyo Loach is that fish that knows how to soak up the dullness of your tank and bring liveliness to your fish-keeping experience.

An Overview

What Is It?

Yoyo Loach, scientifically referred to as Botia Almorhae or Botia Lohachata, is a part of the Botiidae family. These fish are commonly identified as Pakistani Loach or Almora Loach among aquarists.

Despite being pretty small, they are super energetic and social. And across different parts of the world, they are famous for having a cool temperament and the ability to bring uniqueness to the tanks.

Since they have a friendly disposition, a beginner might mistake them to be an easy-to-handle fish species. They are super hardy and there is no argument on that. But they are not devoid of complicated water tank conditions that are difficult for a beginner to handle.

But If you are someone with prior fish-keeping experience, then they are ideal for you to introduce to your tank.

Origin and Habitat

A Yoyo Loach was first sighted in 1920 by a photographer named Ken Childs. They got their name from him and became a colossal hit in the aquarium line right after their discovery.

The reason Ken Childs gave them this name is directly linked with their rapid body movements and color patterns. Someone familiar with Yo-yos would instantly understand why exactly we call them Yoyo Loaches.

These energetic fish live in different regions of Pakistan and Northern India and can also appear in a few territories of Nepal.

Appearance

When it comes to scaling down monotony from freshwater tanks, relying on a Yoyo Loach helps. Aside from their ability to get along with a good range of fish species, Yoyo Loaches are famous for their unique appearance.

But before delving into their full-body description, remember that there are appearance differences within the same group. Their main profile is the same. But they originate from various regions, leading them to have color and pattern variations.

A typical Yoyo Loach has a long cylindrical-shaped body with a head that looks conical. Excluding other physical characteristics, their head shape helps them stand out pretty well.

While going over color differences, you will notice a Pakistani Yoyo Loach is deeper and brighter than those that come from India and Nepal. And this difference makes the process of identification almost seamless.

Most Yoyo Loaches have a silvery base. But some can feature tan, yellow, stone-gray, and brown-colored bottoms. On top of their prime color sits a distinct reticulated pattern. This is another unique feature that sets them apart.

This pattern is net-like or branch-shaped with thin lines and dots scattered across it. In some fish, this pattern is thinner and slightly subdued. Also, the fish are pros at deepening their base color, helping the pattern to give off a refined look.

The mouth of a Yoyo Loach appears downward with a slightly prominent snout. There is then a visible set of four barbels on the snout that helps them operate in the dark. These barbels can fade out whenever Yoyo Loaches are excited or stressed.

They are quite small and due to their very small scales, they look like scaleless fish to some people.

But apart from all these traits, we know them because of their unique golden-black pattern. When young, the bands on their back look like Y or O alphabets, spelling out the word Yoyo.

The stripes can sit closely or at a distance on their bodies. But with time, these bands tend to grow deeper and thicker. These stripes also help them change their coloration according to the background and avoid falling prey to predators in the wild.

And like their branch-shaped pattern, they have a spine that also functions as a shield. This spine is located beneath their eye. But we can’t really see it because of a tissue hiding it.

Including a tiny dorsal fin and a V-shaped caudal fin, they have 6 fins in total. Their fins are overall small and beautiful including a pair of pectoral fins, a pelvic fin, and an anal fin.

To tell their genders apart, look at the size of male Yoyo Loaches and female Yoyo Loaches.

Like other freshwater fish, females are fuller and duller. And while breeding, a female looks even plumper from the abdomen.

Another difference is long red barbels in males that project from their snouts.

Pro Tip: To determine their age, look at the thickness or thinness of their pattern. Younger Yoyo Loaches have narrow lines while adults have wide ones.

Extra Pro Tip: The spine ejects whenever their safety is threatened. So, while shifting them, make sure you don't have direct contact with their knife-like spine.

Lifespan

The average lifespan of a Yoyo Loach ranges from 5 to 8 years in captivity.

A fish that usually lives for this period gives you enough time to understand it completely and become more experienced as an aquarist. While this is an overall healthy lifespan estimation, some aquarists recorded their Yoyo Loaches living up to 10 years.

To get them to live that long, you need to house them in an aquarium that is a solid copy of their natural habitat.

Average Size

A full-grown captive-bred Yoyo Loach is typically 2.5 inches long, which is a pretty small size. Because in the wild, Yoyo Loaches can easily go as big as 6 inches.

A home-bred Yoyo Loach, however, finds it demanding to stretch up to this size.

There are some contributing factors that influence their growth and can help them grow bigger. The major ones are diet, tank size, fish species that they are kept with, and genetics.

Care

A Yoyo Loach is an easy-going fish with a decent tolerance for water shifting. But as I mentioned earlier, they are not beginner friendly.

There are several conditions that you need to consider before housing them. The most important one is the water quality.

In their natural habitat, Yoyo Loaches prefer slightly acidic waters with a temperature above 75° F. The fish doesn’t like fast water currents and react to drastic water changes quite negatively.

They move in schools but can act aggressively toward other fish due to many reasons.

This bottom-feeding fish always loves to have live food on their menu including mosquito larvae and brine shrimp.

Before venturing out to buy them, there are some essential things you need to know.

Fun fact: Yoyo Loaches love to play dead like their cousin Clown Loaches. And they can easily recognize their owners.

Aquarium Setup

A good tank setup is one of the major factors that contribute to their overall fitness.

In the wild, A Yoyo Loach inhabits areas with low pH levels with slightly warmer waters. The streams, tributaries, and rivers they come from comprise freshwater, rocks, and plants.

They are bottom feeders and keep themselves adhered to the foot of water areas. While constructing their habitat, go for a tank that is really deep and at least 30 gallons large.

Another thing to consider is vegetation. Introduce plenty of plants throughout the tank to make the Pakistani Loaches feel at home.

Tank Size

As far as the size of the aquarium goes, a tank that is at least 30 gallons is ideal. For a group of Almora Loach, have a tank that is around 110-112 gallons.

A Yoyo Loach can go as big as 6 inches in the wild. And it clearly shows the ideal size of the tank they need to be in. While a captive-bred Yoyo Loach is typically 2.5 inches long, a bigger and deeper tank will improve its growth rate.

Though the fish is less likely to travel to the upper water sections, it is better to cover the surface with a tight lid or hood to prevent them from displaying their jumping skills.

Water Parameters

A Yoyo Loach can put up with decent water shiftings. But the reason they are not beginner-friendly is their pristine water demands.

Generally, Yoyo Loaches are happy with water temperature that is between 75° F to 86° F. They prefer slightly acidic water. So, keep the pH level between 6.5 to 7.5, with water hardness around 3 to 10 KH.

Filtration and Aeration

The apparently scaleless fish is immune to toxins. Because their scales are too small, they can’t survive in unfiltered water. And the slight presence of ammonia and nitrates can put your fish through different fish diseases.

To help them keep thriving, you can go for a hang-on-back filter or a canister filter.

The filtration system should be strong but should not disturb water currents at a higher level. Some of the fish might enjoy a fast water flow depending on their origin. But they usually love low to moderate flow of water.

To boost oxygenation, consider having air stones or a good bubbling device. Even though Yoyo Loaches tend to do well with moderate water currents, these devices can create a good flow down there.

Pro Tip: To break the water flow, place some plants in the stream, Or you can reroute the vent of the filter against the aquarium glass.

Lighting

A Yoyo Loach does well in a dimly-lit tank. Since you are going to be introducing live plants to their aquarium hobby, mild exposure to natural lighting is perfect.

But to monitor them, you need to have some artificial lighting. So in this case, low-watt aquarium bulbs are a sound choice.

Aquatic Plants and Decorations

Healthy Yoyo Loaches never want to get deprived of plants. In fact, the presence of live floating plants is a solid replication of their natural environment.

But keeping plants and Yoyo Loaches together can be a bit tough. The reason is their passion for diving into the substrate and consequently damaging the plants.

Also, they will occasionally nibble on plants once in a while to leave their mark on them.

To prevent this from happening while keeping your fish happy, go for thick plants. Some great recommendations are Asian Ambulia, Amazon Sword, Anubias, and Ludwigia repens. You can also consider having Jungle Vallisneria and Corkscrew Vallisneria.

Also, the fish need hiding spots when stressed. Hence, adding manufactured caves throughout the tank is a great choice. But remember to have caves that are similar to their size. They don’t like broad hiding spots and end up getting stressed even more if there’s no hideout.

Tank Maintenance

Tank maintenance is really important that many fish keepers overlook. A good tank provides an ideal environment for the fish to live in. Moreover, a Yoyo Loach is immune to toxins. Therefore, occasional water column changes can keep fish diseases at bay.

Here are some really simple tips to get you started:

How to clean their Tank?

1. Clean the tank walls with mild soap.
2. Change at least 20% water weekly.
3. Use mild soap or liquid for caves.
4. Weed out the waste plant material from the bottom.
5. Do gravel vacuuming every once in a while.

Substrate

As much as other Yoyo Loach care requirements are important, so is the substrate. In fact, the fish is in constant contact with the bottom areas. And because of that, their sensitive barbels can get damaged pretty easily.

In the wild, they spend some portions of their lives inhabiting areas with low to no rocks and vegetation. But the other times they travel to the streams or tributaries where there is thick vegetation.

In their tank setup, go for the latter option.

Create the base of the tank with a soft sandy substrate and add small chunks of driftwood and rocks. The fish tend to dig into the substrate for chewing down any eatable thing or while playing. A gravel substrate can tear their fragile barbels apart. So, stick to a soft sandy substrate.

And as I mentioned earlier, Almora Loaches can uproot plants while looking through the substrate. Therefore, use plants that can withstand their day-to-day activities.

Community Tank Mates

On a typical basis, the fish is easy to pair up with a good range of species. And because they are schooling fish, housing them in groups is better for them to grow healthy.

Even though they have a relaxed temperament, there are fish species they can almost be fatal for. Typically, a Pakistani Loach can be mildly aggressive fish as compared to other loaches.

There are also some aggressive fish that can be a threat to their peace and harmony.

But before listing out ideal tank mates for them, remember that minor conflicts within the same specie or with other fish are pretty normal. During the fight, the fish will appear somewhat dull. But once the peace is established again, they will go back to their earlier state.

Here’s a list of some compatible Yoyo Loach tank mates:

1. Tetras
2. Glass Catfish
3. Clown Loaches
4. Freshwater Angelfish
5. Clown Plecos
6. Mollies
7. Corydoras
8. African Kribensis
9. Goldfish
10. Platys
11. Bristlenose Plecos

Poor Tank Mates

Avoid housing them with fish that are aggressive or can fall prey to your Pakistani Loach.

1. Fancy Goldfish
2. Cichlids
3. Tiger Barb
4. Large Plecos
5. Red Tail Sharks
6. Oscars
7. Bettas
8. Peacock Bass
9. Jack Dempseys

Breeding

Unfortunately, there are no proven strategies or methods to breed them successfully in captivity. It is true that some professional breeders were successful in breeding them in home aquariums. But as someone who is not that experienced cannot do that.

There are multiple reasons why it is hard to breed them in community fish tanks. The major one is that they travel to different areas in the wild.

It is almost impossible to know how exactly they plan out the spawning from attracting the females to laying eggs there (video source of Yoyo loaches spawning). Also, replicating those conditions is extremely demanding.

However, if you persist in breeding them, there are some important things to keep in mind.

To condition them to breed, keep the temperature above 77° F in a 40-gallon aquarium.

A proper diet should include more vegetables on the Yoyo Loach menu with a mild restriction on meaty foods.

Once you are done with that, line the tank with a net to protect the eggs from breaking. Wait for almost a day for the fry to hatch. The eggs look clear initially. Then, they will change the color to gray after a while.

In a single spawning season, a female can lay almost 5000 eggs. But not all of them survive.

Food and Diet

For a healthy fish, you need to give it a good-round diet. Thus, adding good variables of foods on the menu Yoyo Loach prefers should be the priority.

They are omnivorous species of fish. In the wild, they hunt down live foods such as mosquito larvae and insect larvae to thrive. They also love eating fresh vegetables as a good variation.

Fortunately, they are not picky eaters, which means you can give them almost everything to consume.  

As they live at the bottom, feed the food that sinks down the aquarium. You can go for bottom feeder pellets and algae wafers.

Apart from this, source their diet with freeze-dried food and live food. Some good recommendations are mosquito larvae, brine shrimp, earthworms, bloodworms, and snails.

Excluding mosquito larvae and brine shrimp, feeding Yoyo Loaches daphnia, bristle worms, algae, plant material, and fish flakes are some wonderful options.

Common Health Problems

Among other freshwater fish, a Yoyo Loach will be the first one to catch common freshwater diseases.

The reason is their small scale. As compared to other fish, the scales on this fish do not offer too much protection. And as a result, they are the first ones to get affected by ailments.

Even though this is common, there is no specific disease to worry about. Due to various reasons, they can come across common fish diseases. Such as Ich, Skinny Disease, and Cotton Ball Disease.

They are also prone to stress so avoid things that can lead them to stress.

Ich

This disease can intrude on your tank because of protozoan Ichthyophthirius multifiliis. This disease is contagious and can affect other fish rapidly. To avoid this, segregate the affected fish. And give mild medication to the single Yoyo loach.

Here are some common symptoms:

1. White patches on fins, gills, and other body organs.
2. Scratching the body against rough surfaces.

Cotton Ball Disease

This is another common fish ailment caused by poor water quality.

Some common symptoms are:

1. While mucus layering around the gills.
2. Shortage of breath
3. Strange swim patterns

Skinny Disease

This skinny disease usually occurs due to internal parasites. This is also known as Chronic Wasting Syndrome.

Some common symptoms are:

1. Loss of color
2. Rubbing against rough objects
3. Loss of appetite
4. Unusual hiding

Treating all these diseases is possible. But you have to be really careful while giving them any medicine. Since they can’t withstand a higher dose or even a normal dose of medication, consider checking labels for products that are safe for loaches.

FAQs

Closing Thoughts

If you’re looking for a generally peaceful, colorful fish to add to your planted or community tank, the Yoyo Loach is a great option. These little guys are social and love to swim in schools, so make sure you have plenty of space for them in your aquarium. Have you kept Yoyo Loaches before? Let us know your experience in the comments!

📘 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.

Pencilfish are one of those nano fish I genuinely love recommending to planted tank keepers who want something a little different. I’ve kept them in heavily planted setups and they look incredible — that horizontal stripe pattern, the way they angle themselves slightly nose-up at rest, the slow deliberate movement through the tank. They’re not demanding fish, but they do need calm water, soft conditions, and peaceful tankmates to really show their best colors and behavior.

Pencilfish (Nannostomus spp.) are one of those groups that experienced hobbyists seek out but beginners often overlook. They’re slim, elegant, and swim with a distinctive head-up tilt that sets them apart from any other nano fish. They’re blackwater fish at heart — they do best in soft, acidic, tannin-stained water, which makes them excellent tank mates for other Amazon basin species. The most commonly kept is the three-lined pencilfish (N. trifasciatus), but the genus has about 20 species, each with their own look. Here’s the full care guide.

Overview

Origin and Habitat

Like many other fish in the aquarium hobby, pencil fish originate from South America. These fish have a wide range and can be found throughout parts of the Amazon River basin as well as in Venezuela, Peru, Guyana, Suriname, and Colombia. There, they can be found schooling above a leaf-littered substrate or in and out of dense vegetation.

Unlike the many other species they’re found swimming alongside, pencil fish aren’t the most colorful fish. That isn’t to say that these fish aren’t worth keeping, though!

Pencil fish are not commonly found in typical fish stores. They’re easy to keep and can be kept in a community tank, but hobbyists tend to shy away from them. The fact of the matter is that there are more exciting and colorful fish available. However, a school of pencil fish can encourage other fish to come out of hiding and provide an interesting topic for onlookers.

Pencil fish belong to the Nannostomus genus, meaning small mouth. As we’ll see, these fish have very small mouths that can make stocking tank mates easy but feeding difficult. As of now, there are about 19 discovered species, many of which have made their way into the home aquarium.

Appearance

Pencil fish aren’t the biggest or brightest fish you’ll see in the aquarium. However, these fish are still interesting to look at and can definitely bring excitement to the tank where other species can’t.

These fish get their name from their very slender bodies with two pointed ends. Oftentimes, these fish will have thick lateral stripes that help give them a pencil-like appearance. Pencil fish come in relatively plain colors, like browns, yellows, and muted reds. Some of the more intensely colored species may resemble a cherry barb (Puntius titteya).

On average, pencil fish grow to be about 1.5 – 2.0 inches. There are few differences between males and females; males typically have more intense coloration while females are plainer and rounder in shape.

Care

Though not common to see in the aquarium setting, pencil fish are pretty easy to care for. They are small schooling fish with low activity levels that can make a great alternative to a more traditional school of tetras or rasboras.

The only challenging aspect of keeping pencil fish can be fed.

Tank Size

Pencil fish are small fish that don’t need a lot of open swimming space. They’ll float around the middle and bottom portions of the tank in a loose school, investigating each other and the environment around them.

While these freshwater fish only grow to be a couple of inches, they need to be kept in schools. Because of this, the minimum tank size recommended is 10 gallons for the smallest pencil fish species. It is strongly recommended to get upwards of a 29 gallon aquarium to allow for tank mates.

Pencil fish are one of the few fish that does better in a tall tank than in a long tank. Different species of pencil fish prefer different regions of the water column, allowing hobbyists to mix and match for a full spectrum from top to bottom.

Aquarium Setup

Like many other Amazonian species, pencil fish thrive in a planted aquarium. These fish love to pick through leaf litter and forage vegetation for any algae growth. The waters of their natural habitat are typically stained with tannins from driftwood and detritus littering the sandy substrate. These conditions should be matched in the aquarium as best as possible.

Pencil fish are bold and curious fish, but appreciate a backdrop of plants to occasionally swim through. The best part about these fish is that they are considered a dither fish, motivating other shyer-planted tank species to come to the front of the aquarium.

At the same time, pencil fish can be kept in a simple tank setup. These aquarium fish are also suitable for beginners that might not be ready to tackle a full freshwater ecosystem with live plants just yet.

Water Parameters

Pencil fish are tropical fish that need relatively consistent water parameters. They need a constant water temperature between 72-82°F with slightly acidic and soft water. pH should remain between 6.0-7.5 with water hardness between 4-8 KH.

Water pH and water hardness may be lowered by using dried botanicals that release tannins. Not only does this improve water quality, but leaf litter can also be used to provide your fish with food and protection.

Filter and Aeration

Pencil fish do not create a lot of waste, but a lot of waste can be created due to their feeding.

Pencil fish have very small mouths that sometimes make it hard for them to accept traditional fish flake foods or pellets. Because of this, hobbyists often need to crush up foods or give protein-rich live foods. On top of this, many pencil fish refuse to eat off the bottom of the substrate. This can lead to some waste management issues.

The best filtration for pencil fish will be a sponge filter, hang-on back filter, or canister filter that is rated for at least 2x the aquarium size. Additional aeration can help keep waste off the substrate and improve oxygenation but is not necessary for the success of the fish.

Lighting

Like most South American fish, pencil fish appreciate the coverage. Most of the small rivers and streams that run throughout the continent are stained black from botanicals. This makes for very shaded water that helps fish swim in the open.

Pencil fish will do best with dimmed lighting along with some floating plants. Larger background plants may also be used to create more areas of refuge. This will help your pencil fish be more present in the aquarium, which will subsequently encourage other fish to be brave, too.

Community Tank Mates

In general, pencil fish are considered peaceful fish that can be kept with a variety of tank mates. However, there are a few stories about a school of pencil fish being very aggressive to each other and to other fish.

It should be noted that pencil fish can become considerably aggressive for several reasons. Pencil fish can become territorial during feeding times and breeding periods. Try to keep your fish well fed and feed in a separate part of the tank away from the other species. Add additional fish if there is intraspecies aggression.

That being said, pencil fish luckily have very small mouths and they can’t do a ton of damage, especially if they can’t catch the other fish. Some of the best pencil fish tank mates include:

• Tetras
• Barbs
• Rasboras
• Corydoras
• Platies
• South American cichlids

Because of their ability to be more aggressive, pencil fish are a popular tank mate for South American dwarf cichlids, like Apistogramma. Pencil fish can help cichlids be more in the open and there is little need to worry about potential fry being eaten.

How Many Should You Get?’

Pencil fish are social schooling fish and need to be kept in groups of at least 6 or more. If you are having intraspecies aggression, then adding more pencil fish to the group may help decrease tensions.

Food and Diet

Pencil fish are omnivores but are mostly carnivorous. Feeding these aquarium fish can be slightly more challenging than keeping more common tropical fish, but is relatively straightforward.

There are two things to consider when feeding your pencil fish. One is that they have very small mouths. Two is that these fish are unlikely to eat off the bottom of the tank. This means that small foods that don’t sink fast are ideal.

A varied diet can include live and frozen food, like brine shrimp, daphnia, and microworms. A high-quality fish flake food or pellet may be broken up into smaller pieces. For the most part, these fish will get all the green nutrition they need from the natural flora growing in the aquarium, but an algae flake or pellet along with blanched vegetables may also be supplemented.

All uneaten food should be removed.

Breeding

Pencil fish aren’t the easiest species of freshwater fish to breed, but it has been done before. Beckford’s pencil fish seem to be the easiest to breed (video source).

Pencil fish are egg scatters that don’t provide any care for their young; the eggs are laid, fertilized, and hatched, leaving the fry to fend for themselves. For the best results, a breeding tank is recommended.

This breeding tank should be dimly lit with a dark substrate and plenty of aquatic plants. A sponge filter will keep the aquarium clean and oxygenated without the threat of sucking up babies. When ready, move a group of pencil fish to the aquarium. This is necessary as it can be very difficult to tell males apart from females.

Slowly adjust the water temperature to about 84° F. Feed a high-protein diet. Eventually, males should start to intensify in color. Females may begin to deposit their eggs among the leaves, which will then be fertilized by the male.

It is strongly recommended to remove the adult pencil fish from the aquarium once the eggs have been laid. The eggs hatch and fry and become free-swimming after about a week. The fry should be able to sustain itself on the microorganisms available in the tank, especially if a sponge filter is available. However, crushed-up fish flakes may also be offered.

Eventually, the fry will be able to be removed from the breeding tank.

Types

Of the 19 species of pencil fish known, many have made their way into the aquarium trade. These fish are generally inexpensive, but certain species fetch more money than others.

It should also be noted that pencil fish are still largely wild-caught, which can make for a more difficult transition to the home aquarium.

1. Diptail

• Scientific Name: Nannostomus eques
• Adult Size: 1.5 inches
• Color Pattern: Brown, black, tan
• Unique Traits: Lateral black stripe

Also known as the brown pencil fish or hockey stick pencil fish, the diptail pencil fish has a very natural appearance. These fish live in the Amazon and are excellent micro predators. They are one of the shyer species of pencil fish and will spend their time hunting for small organisms around the tank.

At first glance, this fish might resemble a Siamese algae eater (Crossocheilus oblongus) or Otocinclus catfish.

2. Dwarf

• Scientific Name: Nannostomus marginatus
• Adult Size: 1 inch
• Color Pattern: Brown, black, yellow, red
• Unique Traits: Lateral black stripes and red-tipped fins

The dwarf pencil fish is a favorite for nano hobbyists. Some experienced pencil fish keepers like to keep these fish in as little as 5-gallon aquariums.

The dwarf pencil fish originates from Guyana and Suriname with very acidic and soft water. They have been found in pH as low as 4.0.

3. Coral Red

• Scientific Name: Nannostomus mortenthaleri
• Adult Size: 1.5 inches
• Color Pattern: Brown, white, red, black
• Unique Traits: Broad lateral red stripe outline in black

The coral red pencil fish is one of the most popular species of pencil fish in the hobby. These fish are small with a brilliant stripe of red across their bodies. They originate from Peru–given their second most common name, the Peruvian red pencil fish–and appreciate a densely planted aquarium that helps bring out their intense coloration.

4. Golden

• Scientific Name: Nannostomus beckfordi
• Adult Size: 1.5 inches
• Color Pattern: Brown, yellow, black, red
• Unique Traits: Lateral black stripe with red fins

Also known as Beckford’s pencil fish, the golden pencil fish is probably the most common species to come across in fish stores. These fish are usually plain in color but can turn incredible shades of red in correct environmental settings and/or during spawning periods.

These fish originate from northeast regions of South America but have been successfully commercially bred.

5. Purple

• Scientific Name: Nannostomus rubrocaudatus
• Adult Size: 2 inches
• Color Pattern: Red, blue, black, brown
• Unique Traits: Lateral black stripes with bluish-white to red gradient

Probably one of the most expensive pencil fish available, the purple pencil fish might not be what you expect (video source). These fish are not completely purple as their name suggests. Instead, purple pencil fish have a bluish-white to red gradient from their head to their tail which can appear purple under certain lighting.

Although these Peruvian fish might not be purple, they are one of the larger pencil fish species that can be used to fill up a planted aquarium with intense coloration.

Final Thoughts

When thinking of freshwater fish to add to your aquarium, pencil fish might not be at the top of your list. They might not even be on your list at all. Over the next few years, this will likely change. Pencil fish are great beginner fish that are small and easy to keep.

Hobbyists may run into some initial problems during feeding times and when picking the right tank mates, but pencil fish can either fill up their own space in the aquarium or be used to encourage other shyer 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.

Red eye tetras are one of those fish I find myself recommending more often lately — they’re tough, affordable, and school really well in numbers. I think they get overlooked because they’re not as flashy as neon tetras, but in a planted tank with good lighting those bright red eyes catch the light beautifully. They’re also significantly hardier than most small tetras, which makes them a better practical choice for a lot of community setups.

The red eye tetra (Moenkhausia sanctaefilomenae) is one of the most common and affordable schooling fish in the hobby, but it often gets passed over in favor of flashier species. What it lacks in vibrant body color it makes up for in toughness and adaptability — these are genuinely hardy fish that handle a wide range of water conditions. That bright red iris is the signature feature and really does pop under good aquarium lighting. One thing worth noting: they can be mildly nippy with long-finned tank mates. Here’s the full care guide.

Speaking of tetra species, one can never neglect the red eye tetra. 

A Quick Overview

What Is It?

The red eye tetra is a freshwater aquarium fish with a full body and a typical tetra shape. They reach around 3 inches in length and live up to 5 years in captivity. Red eye tetra is a beginner-friendly fish that feed on animal and plant matter.

Origin and Habitat

The red eye tetra originates from South America in Brazil, Paraguay, and Argentine. However, there are rarely any wild fish available for sale. Because of its popularity, red eye tetras are bred in vast numbers commercially for trade purposes in Asia.

In their natural habitat, they come from clear water with dense vegetation of floating aquarium plants, including Eichhornia and Salvinia. Besides, being a fish from clear waters, the red eye tetras are known to inhabit the cloudy and murky waters of Amazon with heavy plantations.

Appearance

The name, red eye tetra perfectly fits the appearance of these fish since their bodies are shiny and silver in color accentuated by black tails and eyes. Also, the tails of red eye tetra are black with a prominent white border around its edges, making a beautiful outline that grabs attention instantly.

The eyes of red eye tetra have a red outline with the outer rim, bright red, and a black dot on the inside. These colors and markings make red eye tetra a beautiful addition to your aquarium settings.

Average Size

The red eye tetra is a medium-sized fish growing for around 3 inches in the wild and 2 inches in captivity.

Lifespan

If taken good care of, these species of fish can live for up to 5 years in captivity.

Tank Care Guide

Red eye tetras are one of the hardiest tetra species that can live up to 5 years or longer if taken good care of. They are excellent schooling fish and very easy to breed. Thus, the amount of care required to raise a happy and healthy red eye tetra is like any fish that demand nothing but a clean, hygienic aquarium.

Aquarium Setup

If you want to raise a happy and healthy red eye tetra, all you can do is mimic their natural habitat. Red eye tetra thrives in a planted aquarium with low to moderate water flow, a great filtration system, and optimal lighting. Also, since they are schooling fish, the aquarium must have a lot of free swimming space and they should always be kept in a group of 6 or more.

Tank Size

The red eye tetra is an active species of tetra that prefers a tank size of at least 15 gallons if kept in a group of 6. However, if you’re planning to set up a community tank, I recommend a tank size of no less than 20 gallons.

Water Parameters

The Red eye tetra is a tropical freshwater fish that prefers warm, very soft water that is slightly acidic. However, they are known to adapt to hard alkaline water parameters, thus, they can do well in a normal community tank with mixed fish species.

Temperature range: The ideal temperature range for red eye tetras is around 72 to 79 °F​

pH range: The optimal pH range of the red eye tetra tank should be between 6 to 8. Always avoid the drastic shift of pH in the red eye tetra fish tank.​

Water Hardness: Red eye tetra prefers very soft to hard water. The ideal water hardness should be under 180 ppm.

Filtration and Aeration

While installing an aquarium filter, make sure you get one with light currents so there is less water movement since red eye tetra is not a good swimmer and may fall a victim to stress with fast currents. A functional filter with slow water movement is ideal to keep such slow-moving fish happy and thriving.

A good filter will keep your tank clean while an air pump keeps the tank nicely oxygenated, especially if you have fry or a breeding tank with breeding fish. Also, in most cases, the water is Chlorine treated which is harmful to your fish.

Thus, I recommend getting a water conditioner to make the water safe without compromising anything.

Pro Tip: You can also place a small net bag filled with aquarium-friendly peat to the filter. This will help in stimulating blackwater conditions loved by the red eye tetra.

Lighting

These fish species are not at all a fan of bright lighting so you should go for a dimly lit aquarium. However, if you have many live plants in the tank, I suggest investing in an adjustable LED light that suffices the needs of aquatic live plants.

Aquatic Plants and Decorations

Since the natural habitat of the red eye tetra is densely populated with aquatic plants, I highly recommend setting up an aquarium with live plants. You can use foreground, midground, and background plants.

However, whatever you choose to do, make sure there’s a lot of swimming space available to them. Red eye tetras are surface or middle dwellers and they prefer free swimming space. You can also keep driftwood, Java moss, and Java fern.

I highly advise keeping driftwood as it gives your tetra tank a more natural feel. Also, driftwood release tannins that help maintain the ideal pH of your Red eye tetra tank.

Substrate

To highlight the beautiful colors and patterns of the Red eye tetra fish, you can use a dark substrate. Also, expert aquarists mostly use river sand as the substrate for red eye tetras. 

Community Tank Mates (moenkhausia sanctaefilomenae)

Rd eye tetras are playful, active fish that do pretty well with most fish. However, you have to research well before choosing their tank mates. Red eye tetras are slow-moving fish. Thus, any fish that deviates from this principle would be a problem for your beautiful pets. Also, I won’t suggest getting any long-finned fish as their tank mates provided the fact that they are fin nippers.

The red eye tetra is a schooling fish that should be kept in a group of 6 or more with neutral water conditions. Thus, always keep them in groups and with the same peaceful freshwater fish. If you’re opting for the same species aquarium specimens of the red eye tetra, I recommend getting a tank of at least 15 gallons. The bigger, the better.

However, if you’re going for a community aquarium with other tetra species and freshwater fish, a larger aquarium of 20 gallons should be your bare minimum tank size.

Some of the good tank mates for the red eye tetra (moenkhausia sanctaefilomenae) are:

1. Serpae Tetras
2. Black Neon Tetra
3. Buenos Aires Tetra
4. Rasboras
5. Platy Fish
6. Black Diamond Neon Tetra
7. Rummy Nose Tetra
8. Zebra Danio
9. Giant Danios
10. Western Rainbow Fish
11. Black Skirt Tetra
12. Molly fish
13. L.Guntea Loach
14. Botia Loach
15. Pencil Fish
16. Apple snails

Avoid keeping your red eye tetras with larger or aggressive fish as they might bully and hurt your red eye tetras.

Pro Tip: If you're building a community aquarium, I prefer keeping a combination of bright-colored fish with red eye tetra to add aesthetic value to their tanks. For example, you can keep bright-colored fish like Serpae tetra or Albino Buenos Aires Tetra and cherry barbs with the red-eyed tetras with live aquarium plants, driftwood, and river sand to spruce up the look of your freshwater aquarium tank.

Breeding

I’ll be very honest – breeding red eye tetras is not a piece of cake.

To breed red eye tetra, you need to maintain the optimal conditions that are super hard to hold, especially in the standard tank. For example, a breeding pair would thrive in very soft water that is slightly acidic with floating plants. 

Since the red eye egg tetras are egg scatterers, after successful spawning, they scatter their eggs onto the plants. Thus, floating plants are a requirement for a breeding tank. Therefore, you need separate tanks for a breeding pair of red eyes. Spawning mop material can also be used as shown in the video below by Paul’s Fishroom.

Setting up a separate breeding tank for Red Eye Tetra

As mentioned before, red eye tetras scatter their eggs after successful spawning and usually end up eating them. To set up a separate tank for red eye tetras, you need:

1. An air powered sponge filter to filter out the toxins 
2. Avoid lighting or adjust the lighting to their lowest level
3. Add floating plants, java moss, or any other plastic mesh to collect the eggs before the adult fish start eating them. I suggest using spawning mops
4. Maintain the pH levels and water temperature in your breeding tank. I also suggest adding Indian almond leaf to reduce the pH levels below 7
5. Keep the adult fish in the breeding tank for at least 2 days and monitor the conditions. Remove the fish if you spot eggs at the bottom of the tank
6. The female releases about a dozen eggs after each spawn that are translucent and around the size of a grain
7. The eggs of red eye tetras hatch in around 24 to 48 hours
8. The newly hatched fry gets its nutrients from the yolk sac and can be found free swimming after two days
9. Surprisingly, the baby fry of red eye tetras is comparatively bigger than most tetras. Luckily, they are easy to raise unlike most tetra fry
10. The fry feed on fine live fish food and commercially prepared fry foods. However, during the first few hours of their life, they are fed with infusoria
11. After 3 days of hatching, you can feed the fry with freshly hatched brine shrimp, crushed flakes, mosquito larvae, micro worms, etc. 
12. To keep the fry healthy, it’s crucial to follow a 25% water change after every 3-4 days.

Food and Diet

Red eye tetras are omnivorous and voracious eaters that feed on a varied diet. Thus, feeding red eye tetras is the easiest job but in moderation. In the wild, the red eye tetra usually feeds on worms, insects, crustaceans and plant matter, etc.

However, in captivity, you can feed them with high-quality flake food, pellet food, freeze-dried and frozen food, live food, spirulina-based food, micro worms, mosquito larvae, bloodworms, daphnia, brine shrimp. Also, dried flake foods and granules with some vegetable matter such as spinach leaves and algae-based food would work wonders on the overall health of your fish. I believe that fluval bug bites are a great option for most tropical fish as a food staple.

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Common Health Problems and Diseases

One of the best companions you can get is a hardy red eye tetra fish with little to no problems in a well-managed and maintained aquarium setting. Make sure to observe clearly whatever you add to your tank as anything new can introduce fish diseases in the aquarium. Therefore, I always advise novice fish keepers to properly clean all the equipment and quarantine the new fish before adding it to the community aquarium.

However, no fish comes with a guarantee, and like other fish, the red eye tetras are vulnerable to such fish diseases:

1. Skin flukes
2. Parasitic infestations
3. Ichthyobodo infection
4. Parasitic infestations (protozoa, worms, etc.)
5. Bacterial infections (general)
6. Bacterial diseases

If by chance, you find an infected fish in the aquarium, I suggest removing it immediately before the virus spreads in the whole community aquarium. Also, to prevent these diseases, always maintain the water temperature, hardness, and pH, and mimic the natural environment of your red eye tetras. 

Differences Between Male and Female

Like most tetras, the difference between male red eye tetra and female red eye tetra is almost indistinguishable. However, when the females are full of eggs, they will appear much bulkier and rounder than males.

Whereas, the male red eyes get very colorful when they are ready to mate. It is highly recommended to get bright-colored male fish as a breeder fish.

FAQs

Final Thoughts

The red eye tetra Moenkhausia sanctaefilomenae are popular freshwater fish that are readily available in the aquarium ecosystem. These fish were first found and caught in the wild. However, now, they are bred in Asia as a hobby. Redeye tetras, despite not being flashy, are an interesting addition to your home aquariums.

📘 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.

🐟 This article is part of our Tetras: Complete A-Z Species Directory — your guide to every tetra species in the hobby.

Congo tetras are one of my top recommendations when someone wants a large, showy schooling fish for a planted tank. I’ve seen them in person at trade shows and the iridescent shimmer on a healthy male under good lighting is genuinely impressive — blues, golds, and oranges shifting as they move. They’re bigger than most tetras at around 3 inches, which means they need more space, but that size also means they hold their own and look substantial in the tank.

Congo tetras (Phenacogrammus interruptus) are one of the most spectacular large tetras in the hobby. The males develop iridescent scales that shift through blues, greens, and golds under good lighting, and their fins develop flowing extensions as they mature. They come from the Congo River basin in Africa — which sets them apart from the typical South American tetras — and they prefer the soft, acidic water of their native habitat. One point I always make: they need space. Males reach 3 inches and they look their best in schools of 6 or more in a roomy tank. Here’s the full care guide.

Don’t worry, Congo tetra has the capacity to comply with your needs and demands. This freshwater fish knows exactly how to stand out. Their low-maintenance leads you directly to diversify your range of aquarium fish completely trouble-free!

In this guide, we’ll go over their care requirements, history, natural habitat conditions, and pretty much everything you need to know.

Species Overview

What Is A Congo Tetra?

Congo Tetra, scientifically known as Phenacogrammus Interruptus, is a freshwater fish species. They are part of the Alestidae family from the order Characiformes.

Congo tetras are professional representatives of peace, grace, and beauty. With originating from a certain point of the ocean world, they are now an important part of aquariums all around the world.

Apart from these visible characteristics, they are largely capable of morphing themselves according to the need of the hour.

As a beginner or seasoned aquarist, adding Congo Tetras to your tank will be worth the time that you devote to their maintenance.

Origin and Habitat

A Congo Tetra was first sighted in 1949 in the Congo River Basin in Zaire, Africa. They got their name from the Belgian-British zoologist George Albert Boulenger.

Because of being tough to breed, they couldn’t mark their existence in the aquarium world until the 1970s.

For a healthy survival in the wild, Congo Tetras hunt down live insects and prefer living in moderate to fast freshwater currents.

Appearance

A Congo Tetra looks absolutely stunning because of its unique and striking color combination and elegant fins. While fish keepers all around the world admire them due to their calm turn of mind, their colorful bodies help them stand out perfectly, too.

Congo Tetras feature a beautiful spectrum throughout their bodies. While their heads and bellies are covered in blue, a red shade laced with a golden touch dominates the middle part.

Their long and flat bodies look considerably smaller than compared to their beautiful extended fins.

A Congo Tetra composes long fins with subtle transparency visible on their fins. And these fins are yet another reason linked directly to their fame and admiration, with the sporty tail fin serving as a prominent characteristic.

Apart from mixed body coloration, you can see a stripe stretched along their midsections. The band starts from their heads and ends at the tails. Since they have long and translucent fins, Congo Tetras are irresistible to watch while swimming.

There is also a visible shimmer on their bodies. The hue that you see depends on the lighting. Because they have a range of colors, the hue can appear bright mauve, or ocean colored apart from blue.

Even though Congo Tetras are slightly big in comparison with other tetras, they look compressed because of the large midsection.

It is easy to discern males and females. Phenacogrammus Interruptus are sexually dimorphic and therefore have visible gender differences.

As with most fish, the male Congo Tetra fish present vibrant body coloration and colossal size. The females are plumper, especially when they are ready to breed.

Other than being taller and vibrant, the male Conga Tetras have larger dorsal fins. These fins give a feathery appearance that looks more beautiful in the water.

You can also see a violet shade on the fins of males with a beautiful white edging, with their tail fin present along the vertical medial line.

Aside from these beautiful physical characteristics, their dark black and red outlined eyes play an important part in adding up to their beauty even further.

Lifespan

While their average lifespan is between 3 to 5 years, reforming their water conditions can help you support them to live longer and healthier. A Congo Tetra does well with a range of foods, but a well-rounded diet is necessary.

Their ideal water temperature is around 73° to 82° F, with a slightly higher pH level.

Stick around till the end because we will go over all the details, including water conditions and dietary requirements step by step.

Average Size

A Congo Tetra is at least 4 inches long. That’s their average adult fish size, however, they can stretch themselves up to 4.2 inches easily in the wild.

if you have farm-bred Congo Tetras, then growing over 3 or 3.5 inches is pretty hard for them.

As compared to other types of tetras, Phenacogrammus Interruptus are bigger and grow to their full length in a brief span of time.

Care Guide

When it comes to starting out as a beginner aquarist and finding a suitable fish, Congo Tetras fit the bill for many requirements.

There are several reasons they are always on the forefront of mind to consider housing in a freshwater aquarium. One prime example is their easy-to-manage care requirements, easy Congo Tetra diet, and overall demands.

In their natural habitat, the fish is pretty skillful to go with fast water currents and enjoy swimming in low water currents simultaneously. It mainly depends on the situation.

In the wild, they love hunting down live insects to sustain themselves. Unlike other fish that are susceptible to aggressive or territorial behavior, Congo Tetras are completely peaceful and schooling fish.

If you thoroughly understand their water conditions and dietary requirements, they can easily stand firmly against the common fish diseases and live longer.

Here are some essential things to consider before having a Congo Tetra.

Aquarium Setup

While thinking about the Congo Tetra tank setup, being well up on their preferred tank conditions is essential.

In the wild, you can find Congo Tetras in the Congo River, Africa. They live in groups in streams, marshes, pools, and tributaries.

Congo Tetras prefer slightly higher pH levels with large vegetation surrounding them. This calm fish can tolerate subtle water changes, but it’s highly recommended to gauge water parameters as per their needs.

Even though they populate areas where the vegetation is tall, mimicking the exact condition, can disturb their free moving.

Phenacogrammus Interruptus live in the upper sections of water, travelling rarely to the bottom. And as because they are active, you need to secure their tank with a lid to avoid any mishaps.

Tank Size

The ideal Congo tetra tank size should be at least 30 gallons. While some people go under the recommended tank size, I would urge you to get a 30-gallon tank to boost tourism within.

Congo Tetras that are not farm-bred can grow up to 4.2 inches, with the captive-bred at least 3.5 inches long. A schooling fish of this adult fish size will never be happy with smaller tanks.

Even if you overlook their size, think about the decorative items and plants you will introduce to their tanks. Smaller tanks will be filled up with that, leaving little space for the fish. However, a 30-gallon tank can easily house fish and other stuff that you put in it.

Water Parameters

Before housing Phenacogrammus Interruptus, you need to understand what Phenacogrammus Interruptus prefer. Because that has a straight connection with their well-being and is an essential part of proper Congo Tetra care.

The water of the Congo river is slightly acidic, with a water temperature ranging between 73° F to 82° f. Their preferred acidic levels shift between 6.0 to 7.5, with water hardness between 3 to 18 KH.

Filtration and Aeration

As much as other factors involved in their overall maintenance are important, so are filtration and aeration. To keep the ecosystem of their freshwater aquarium intact, you need a solid filtering system.

The excellent recommendations can be a standard canister system or a carbon filtering system. These strong filtration systems will keep the waste levels low and overall water quality up to the mark.

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Lighting

Exposure to bright lighting can significantly disturb their day-to-day activity. Congo Tetras spend most of their time hiding in caves and around plants and neglecting eating and swimming if the lighting is too bright.

Dim light will bring out their proper coloration and motivate them to swim around hassle-free.

Place their freshwater aquarium in a place that is dimly lit. Since monitoring them is important and in subdued light, you can’t do that, use LED bulbs.

Aquatic Plants and Decorations

Your Congo Tetra is a very adaptable fish, but it will not compromise on plants. Plants are not only necessary to make your aquarium beautiful, but they are important to keep oxygen levels up.

While floating aquarium plants will make them feel at home, you are likely to overfill the tank.

To avoid this, try out these live plants:

• Java Fern
• Java Moss
• Water Wisteria
• Water Sprite
• Rotala Indica
• Cabomba
• Anacharis
• Ludwigia repens.

Place these plants at a distance so your fish can easily swim around. Another reason you shouldn’t put the plants closely is the inability to see them due to the density of vegetation.

Your Congo Tetra will use these plants to hide while threatened or when the light is beyond their tolerance. So, make sure you have an adequate amount of them in the tank. Also, introduce caves and aquarium rocks as another hideout option for them.

Tank Maintenance

When the water tank contains so many plants and a group of fish, maintaining it becomes a bit tough.

But, don’t worry! Here are some very easy steps that you can follow to keep your aquarium tank clean and new.

How to clean the tank of Congo Tetras?

1. Start with cleaning the aquarium walls with mild soap.
2. Weed out the waste plant material and plant new aquarium plants occasionally.
3. Use lukewarm water to clean the manufactured caves.
4. Add fresh water to the tank every now and again to avoid excessive algae growth.

Substrate

Congo Tetras stay at the middle and top water levels. But a substrate that resembles their natural habitat, River Congo, will be absolutely recommended.

Since Phenacogrammus Interruptus prefer darker water environments, a dark gravel, sand, or silt substrate will be ideal. You don’t have to add too many rocks because the primary focus should always be on fresh plants.

Community Tank Mates

A larger group of aquarists prefer housing Congo Tetras because of their calm nature. As a beginner aquarist, handling any aggressive fish will be really hard. Hence, your chances of having a peaceful fish-keeping journey will be ruined.

A Congo Tetra does well with a range of fish species. They are already schooling fish, which means surviving alone is impossible for them.

But, before I give you a list of tank mates, you should know that the male Congo Tetras are delicate. Any fin-nipper will most probably hunt down their fins, resulting in a serious injury.

Congo Tetra tank mates should align with their size and nature. Here’s a list of some community tank mates to consider:

1. Rainbow fish
2. Neon Tetras
3. Swordtail Fish
4. Mollies
5. Corydoras
6. Ember Tetras
7. Barbs
8. Elephant Nose Fish
9. Dwarf Cichlids
10. Rummy Nose Tetras
11. Celestial Pearl Danio
12. Platy Fish
13. Chili Rasbora

Poor Tank Mates

Avoid housing them with any aggressive fish or fin-nipper.

1. Bucktooth Tetra
2. Tiger Barb
3. Flowerhorn Cichlid
4. Wolf Cichlid
5. Oscar Fish
6. Jaguar Cichlid

Breeding Congo Tetras

Breeding Congo Tetras is pretty simple as long as you follow this proper Congo Tetra Guide. It might look complicated to a beginner since no experience gives way to agitation. But it’s easy and interesting.

While many aquarists prefer farm-bred Phenacogrammus Interruptus, you can easily map out all things for proper Congo Tetra breeding in your home aquarium (video source).

To commence the breeding season, get a 20–gallon separate breeding tank for your male Congo Tetra and female Congo Tetra. Place peat moss at the bottom of the tank and keep the temperature up to 77° F. Also, scale down the lighting if you want to prompt them to breed.

Apart from peat moss, you can introduce breeding mops and plants throughout the tank as a safety measure.

While you are working in all these areas, improving water quality is also important. The best way to do this is to introduce peat moss to the breeding tank and wait for at least 3 days. For filtration, I recommend a small air-powered sponge filter to manage the water aeration and flow.

Once you are satisfied with the overall water quality, separate the intended pair from the rest of the group to add to the breeding tank.

But before you allow them to pair off, keep track of their diet for a span of 2 weeks.

Your Congo Tetras will start spawning the next day of getting in a breeding tank. The male will perform a mesmerizing dance around the female before traveling down to the base of the tank together.

The female will then appear swollen with eggs. They can lay almost 500 eggs in a single spawning round, which can be tough to handle. The peat moss will catch the eggs safely where the eggs can lie scattered until they hatch.

Once the female is done laying eggs, separate the pair from the eggs. Because Congo Tetras can eat their own eggs.

Keep the lights subdued because the eggs are super sensitive to strong lighting. The healthy eggs will appear transparent and they require a week to hatch. You can expect them to take another week to become large fry and begin swimming.

Feed the little fry infusoria for a few days, then shift to other foods. To condition them to develop properly, you can start feeding the newly hatched fry baby brine shrimp, lightly crushed flake food, and rotifers.  

Pro Tip: To identify infected eggs, look for fungal growth and transparency.

Congo Tetra Food and Diet

Aside from being social and peaceful, they are easy to handle because of their undemanding dietary needs. Congo Tetras are omnivores, which means they sustain themselves on blood worms and insects in the wild.

While insect larvae and blood worms are the base of their diet, eating algae and plant matter is also pretty normal.

You can feed them insect larvae, brine shrimp, flake foods, bloodworms, tubifex, and daphnia in your aquarium. Adding vegetables to their diet will also be good since vegetables are good for providing vitamins. They are quite active fish. So, feed them at intervals to make sure they are fed well. Prepare foods like high-quality fish flake food and pellet food work well as staples. Fluval bug bites are a great option.

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As a beginner, this is another plus point for you. Because you don’t really have to make any special variations in their diet due to their humble nature.

But while feeding them, make sure the food doesn’t sink to the bottom of the tank. Moreover, feed them food that is small-sized to prompt better digestion and overall health.

Usually, your Congo Tetra will finish its food within 3 minutes. But in case they are exceeding this time frame, pay attention to their daily activities and behavior.

Pro Tip: Nipping at the plant edges is a clear indication that your fish is not getting enough food to stay full. As soon as you notice that, change their timings to ensure they are getting enough food.

Common Health Problems

Congo Tetras are strong fish and do not fall prey to any specific common fish diseases. However, like other fish, they are prone to some common fish ailments caused by unclean water.

In the wild, the water naturally gets clean. But in your aquarium, you need to replicate that condition. This is to ensure that your fish is breathing in a safe aquarium environment free from the waste they produce.

Here are some common diseases with symptoms.

Ich

Ich is a very common fish disease caused by the protozoan Ichthyophthirius multifiliis.

The symptoms are:

1. White dots on fins, gills, and other body parts
2. Rubbing the body against rough edges

Flukes

This is another common fish disease caused by parasites.

The symptoms are:

1. Red spots on the body, especially on the gills
2. Difficulty in breathing
3. A large amount of mucus

Products like Prazipro are great for treating this disease.

FAQs

Closing Thoughts

If you’re looking for a beautiful and peaceful fish to add to your community tank or planted aquarium, the Congo Tetra is a great option. These fish are social and thrive when kept in groups, so make sure you have plenty of room in your tank for them! Thanks for reading – we hope you enjoyed this post. Have you kept Congo Tetras before? Let us know your experience in the comments below!

📘 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.

🐟 This article is part of our Tetras: Complete A-Z Species Directory — your guide to every tetra species in the hobby.

Nerite snails are probably my most-recommended algae-eating invertebrate, and the reason is simple: they’re effective without the usual downsides. They won’t breed out of control in your freshwater tank — their larvae require saltwater to develop — they won’t touch your live plants, and they come in shell patterns that are genuinely attractive. Zebra and tiger nerites are the most common, but horned nerites and olive nerites are worth tracking down too. Honest caveat: they do leave white egg casings on hard surfaces, which some people find irritating. Here’s the full care guide.

Species Overview

Introduction

Nerite snails are an anomaly in the aquarium hobby. They are one of the few species that can be kept in entirely freshwater or saltwater conditions as well as mixed salinities in between. Nerites are also one of the best algae-eating species of snail available, making them one of the most popular–and one of the more expensive–types of aquarium snail.

This article will focus only on freshwater nerite snails and their care requirements.

Nerite snails are generally hardy, but they can be sensitive to ammonia and nitrite in the water column, which means that they need a more established setup.

Are They Good For Your Freshwater Tank?

A nerite snail is one of the best additions you can make to your freshwater aquarium, especially a planted aquarium! These snails have a serious appetite for algae.

Nerite snails are proficient algae eaters. They will eat most species of algae, but are most efficient at cleaning up soft types, like hair algae, green spot algae, and green slime algae. They use their modified tongue, called a radula, covered in tiny teeth that help scrape away microflora.

As we’ll see, nerite snails are largely herbivores. They won’t necessarily clean detritus from fish and other organisms in the tank, but they’ll keep plant surfaces and the sides of the aquarium algae-free.

How To Identify

Snails can be hard to tell apart. And the problem is that not all snails are created equally.

Some snails clean algae better while others take care of detritus and even other snails. Freshwater snails can also be expensive, so you definitely want to take the time to understand what the species of snail you want looks like.

Nerite snails are a larger species of snail. There are many species of aquarium snail that belong to the Neritina genus, each with its own identifying characteristics.

No matter the species though, nerite snails grow to be about 1-2 inches on average. These snails have an unbalanced appearance to them, with a rounded shell that tilts into a whorl on the right side. The body of the snail ranges in color from tan to dark brown. Unlike other snails, the body of the snail is usually concealed completely under the shell even when moving.

Unfortunately, there is no way to tell a male nerite snail apart from a female. Another big difference from other snails is that nerite snails are not hermaphrodites. This, in addition to their need for brackish water conditions, makes breeding nerite snails very difficult for the average hobbyist.

Origin and Habitat

Nerite snails have a wide distribution. Most species originate from the coastal waters of Africa but a few are found in the Caribbean or on the margins of the Pacific Ocean. Nerite snails are intertidal and regularly move between the nearby ocean and freshwater rivers and inlets; it is believed that they prefer brackish water conditions most of all.

This crossover between ecosystems leaves nerite snails with a large assortment of foods to eat. They will regularly be seen munching away at algae on rocks and other structures but will travel across the open sandbed as they grow and reproduce.

Care

In the aquarium, nerite snails are relatively hardy. They aren’t as hardy as something like the bladder snail (Physella acuta) that can survive polluted waters, but nerites can definitely withstand some beginner’s mistakes. Nerite snails are most sensitive to changes in ammonia and nitrite.

Otherwise, nerite snails are easy to care for in the freshwater aquarium. If there are enough algae to graze on, they will live for a relatively long time.

Tank Size

Freshwater snails are often limited in tank size due to their high reproductive rates. Nerite snails do not breed in freshwater, so they are one of the better choices for smaller aquariums.

The general rule for nerite snails is 1 snail for every 5 gallons of water; this means that 1 snail will comfortably fit in a 5-gallon betta tank or other planted aquarium. For larger tanks, the number of nerite snails will be limited by bioload. As these snails don’t reproduce in freshwater, there is no way to unknowingly overstock them as long as there is adequate biological filtration.

Aquarium Setup

Nerite snails can be kept in most freshwater tank setups. They excel in planted aquariums with lots of natural algae and microflora that they can graze on, but they’re also suitable for unplanted tanks as long as their dietary needs are met.

Nerite snails aren’t shy, but they’re mostly nocturnal. In fact, nerite snails can sleep for days at a time, only becoming active in short spurts. This means that they prefer to stay somewhere hidden to stay out of reach of predators. Driftwood, plants, rocks, and other aquarium structures can make perfect nooks and crannies for your snail to rest.

Because they’re nocturnal, nerite snails will also prefer dim lighting. The aquarium light may be dimmed or floating live plants and other large plant species may be used to create pockets of shade and refuge throughout the aquarium.

Nerite snails are also intertidal, which means that they regularly move between the water and moist, but not submersed, surfaces. It is not unusual to find a nerite snail at or above the waterline of the tank. They often find their way into the filter and might even crawl onto the outside of the glass. Because of this, it’s strongly recommended to use a fitted aquarium cover.

Water Parameters

Nerite snails need 0 ppm ammonia and 0 ppm nitrite. Any traces of ammonia or nitrite could prove to be deadly to your snails. Like other invertebrates, they also cannot tolerate copper.

Otherwise, these freshwater snails do not need specific water parameters. They are largely tropical species that need a warm water temperature. With proper acclimation, they can be kept at slightly cooler or warmer temperatures. Freshwater nerite snails also prefer a near-neutral water pH between 6.5-8.0 but can adapt to more acidic conditions.

Preferred water parameters largely depend on the conditions the snails are originally being kept. Remember, these are brackish water snails that can tolerate higher salinities and subsequent higher pH levels. Brackish water salinity measures at about 1.005 to 1.010 while full saltwater is 1.023 to 1.025.

Like other snails, nerite snails grow with their shells. They use calcium and other minerals available in the water column to continue growing and maintaining their shells. While these minerals are usually readily available with good source water, they may need to be supplemented every now and then through their diet or with calcium blocks.

An injured or nutrient-deficient nerite snail may have noticeable white scrapes and scratches across its shell. These injuries will continue to progress if calcium isn’t made available for repairs.

Filtration and Aeration

Even though nerite snails only grow to be about an inch or two, they can still create a significant amount of bioload that can affect the efficiency of the filtration being used. That being said, they have also been successfully kept in Walstad-method aquariums that rely solely on the biological filtration provided by live plants and bacteria without any additional equipment.

If the overall bioload of the aquarium is on the higher side, then it could be beneficial to add aeration for better oxygenation and gas exchange.

Lighting

Remember, nerite snails are nocturnal and have an interesting sleep cycle. Lighting intensity doesn’t matter too much, but these snails definitely need a discernible night and day cycle to keep a semi-regular sleep cycle.

Aquatic Plants and Decorations

Nerite snails absolutely love aquatic plants and decorations! But they’re not entirely necessary for the success of the snail.

Nerite snails eat algae that grow on the surfaces of the tank. That means the more surfaces available, the more food your snail has to choose from. They are unlikely to eat healthy live aquarium plants but will help consume any rotting stems or leaves.

Community Tank Mates

As a larger type of snail, nerite snails are among the best community tank snail species. These snails tend to keep to themselves and won’t disrupt other peaceful species.

This makes nerite snails completely compatible with:

• Tetras
• Guppies
• Gouramis
• Rasboras
• Betta fish

In most cases, betta fish can be kept with nerite snails. The problem is that nerite snails can fall off the glass, occasionally landing on their back with their body exposed (yes! these snails can flip themselves back over). A curious or hungry betta may pick at the snail while it’s vulnerable, like other larger and more aggressive fish species.

Food and Diet

Nerite snails will feed themselves as long as there is enough algae available in the tank.

There is little need to offer your snails anything additional to eat, though some hobbyists like to feed algae wafers and blanched vegetables, like cucumbers and lettuce; providing fresh vegetables from time to time can help introduce minerals and nutrients that can’t be obtained otherwise.

In the same way, calcium blocks may be added for healthy shells.

Breeding

Breeding nerite snails are extremely difficult for the average hobbyist. This is because it takes several fish tank setups to be successful. In the wild, nerite snails move between freshwater and saltwater. They are most often observed in brackish conditions for reproductive purposes.

Hobbyists seem to have the most breeding success when acclimating or keeping nerite snails in brackish water. When ready, a male and female will breed. The female will lay eggs in a safe area, usually on the aquarium glass or under a leaf. The nerite snail eggs will hatch after some time into larvae that later develop into recognizable, baby snails.

Nerite snails will not breed in the freshwater aquarium. Female nerite snails may lay their eggs around the aquarium, but they will not hatch. Take this as an indication that your snail is happy and healthy.

4 Types

There are many species of nerite snail, though only a few have made their way into the aquarium hobby. Luckily, there aren’t any big differences between the different types of nerite snails, so you can trust that your aquarium will always get cleaned!

This includes zebra horned nerite snails, zebra nerite snails, tiger nerite snails, and black racer nerite snails.

1. Horned

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Horned Nerite Snail

Horned Nerite Snails are excellent algae eaters for planted tanks.

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• Adult Size: 0.5 inches
• Color Pattern: Black and yellow spiral
• Unique Traits: Small spikes that outline the whorl

The zebra horned nerite snail (Clithon corona/diadema), also known as the zebra thorned nerite snail, is one of the most interesting-looking snails out of all freshwater snail species!

These are tiny snails, usually staying under an inch at full size. Zebra horned nerite snails have beautiful alternating black and yellow stripes, which can help bring a pop of color to the bottom of the fish tank. Their most interesting feature is the tiny spikes that outline the whorl of the shell. These are most likely used in defense against aggressive fish and invertebrates.

2. Zebra

Zebra Nerite

Nerite snails are one of the best algae eating snails you can buy. Plant safe and do not reproduce in fresh water!

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• Adult Size: 1 to 1.5 inches
• Color Pattern: Yellow and black/brown
• Unique Traits: Alternating black and yellow zebra pattern

The zebra nerite snail (Vittina natalensis) is probably the most recognizable species of nerite in the aquarium hobby. These snails are large with very smooth shells. Zebra nerite snails are mostly known for the unique pattern on their shells.

The color of the zebra nerite shell can vary from light yellow to warm orange. Every snail will have a zebra-like pattern with alternating black and yellow stripes that meet at the center of the whorl. Though inexpensive, these snails can bring a clean and expensive aesthetic to freshwater tanks.

3. Tiger

Tiger Nerite Snails

These Nerite Snails will eat algae, are plant safe, and do not reproduce in your aquarium!

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• Adult Size: 1 to 1.5 inches
• Color Pattern: Yellow or orange with black patterning
• Unique Traits: Simple, uniform black spot patterning

Often sold alongside related zebra nerite snails, the tiger nerite snail (Neritina semiconca) has a beautiful natural appearance. These snails can vary in color intensity, from light yellows to dark browns. They are most easily identifiable by the flake-shaped black specks that run across the front of the shell and onto the whorl.

4. Black Racer

• Adult Size: 1 to 1.5 inches
• Color Pattern: Black Appearance
• Unique Traits: Dark ebony base color with lighter striations

Not the most popular, the black racer nerite snail (often categorized as Neritina pulligera) is actually one of the most common nerite snail species to come across at local fish stores. These snails are plain in color under poor lighting and appear as dark brown or black shells. However, under the right light, this species of nerite snail can become a spectacle with dark greens and browns with lighter colors (video source).

Compared to the other nerite snail species on this list, the black racer nerite snail tends to grow to a larger adult size.

Final Thoughts

There are many types of nerite snails to choose from. Each one has its own colorful appeal, but they are all excellent algae eaters that will help keep freshwater tanks clean without disrupting any other the tank inhabitants.

One of the best aspects of the nerite snail is that they can’t reproduce in pure freshwater. However, they can still carry a high bio load so it’s important to not overstock a tank.

📘 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.

When people ask me for a gourami recommendation, I’ve been saying honey gourami over dwarf gourami for years now. Honey gouramis (Trichogaster chuna) don’t carry the disease susceptibility issues that plague farmed dwarf gouramis — specifically the Dwarf Gourami Iridovirus (DGI) that’s devastatingly common in commercially bred stock. Honey gouramis are hardier, genuinely peaceful, and the male’s deep golden-orange coloration during breeding condition is striking. They’re also smaller and well-suited to nano tanks. Here’s the full care guide.

Don’t worry! Honey Gourami got you covered. It is a freshwater fish species that allows you to diversify your attention. Because they do well with a number of fish, you can easily monitor them and their tank mates.

An Overview of Honey Gourami

What is Honey Gourami?

Honey Gourami, scientifically identified as Trichogaster chuna, is part of the Osphronemidae family from order Anabantiformes.

They are tropical fish known for their deferential behavior, colorful body, and labyrinth organ. This organ helps them breathe dry air and survive in areas where the water is low oxygenated. In aquarium trades or even in the wild, coming across a fish like Honey Gourami is pretty rare.

They enjoy freshwaters and prefer sticking to the middle to upper levels of water. Blending in with other fish species isn’t their thing, they like being solo. They accumulate themselves once they feel nothing would threaten their peace and freedom of swimming around.

Origin and Habitat

They originate from the regions of India, Bangladesh, and Nepal. They were first sighted in 1822 by Francis Buchanan, also known as Francis Hamilton.

The male and female Honey Gourami were mistaken for two different species initially. But with study and close inspection, Francis Buchanan identified them as male and female fish from the same species.

In their natural habitats, you can find thick vegetation throughout and poor water quality. They are naturally intimate with slow-moving water with moderate pH levels and warm water temperatures.

Appearance

Due to some similarities between a Dwarf Gourami and a Honey Gourami, they are often confused. Before planning to buy your intended fish, it is better to understand their appearance differences.

A Honey Gourami features golden-yellow, clay-orange, red, and honey shades. Some of them look silver, gray, and brown, which are mostly female Honey Gouramis. There’s a cool brown-colored band starting from around the eyes and ending at the caudal peduncle.

A Honey Gourami is small, reaching up to only 2.5 inches. While most of them are this size, a few of them were recorded stretching themselves up to 3 inches.

They have 7 fins on them, including a pair of small pectoral fins, a dorsal and anal fin, and a caudal fin. You can also see thread-like pelvic fins attached right below their bodies.

The dorsal fin begins from around the forehead, running down towards the caudal fin. Then there is the anal fin that travels side by side with the dorsal fin on the ventral area. Honey Gouramis have tiny pectoral fins attached to their bodies, with a beautiful and long threadlike fin right below that.

The simplest way to tell apart the difference between the male Honey Gourami and the female Honey Gourami is by looking at their coloration, fins, and sizes.

As with most fish species, the males display brighter shades than the females. The females have silver-colored bodies to pale yellow body coloration. The males, however, are bright yellow or orange.

Almost all males change their color to a brighter shade as growing up or during breeding. Whereas in females, you don’t see any color alterations as compared to males. Apart from this, males have prominent fins, while females get rounded anal and dorsal fins. And the males are also slightly bigger than the females.

But both sexes appear thin from the sides and look large from the middle of their bodies. Also, they have white abdomens, which turn dark in and around the breeding season.

The Difference Between with a Dwarf Gourami

Because of bad identification, you can often find a Dwarf Gourami labeled and sold as a Honey Gourami in fish stores. Though there are a few similarities between them, one can easily tell them apart.

Honey Gouramis have narrow bodies and they have smaller dorsal and anal fins. A Dwarf Gourami is 4 inches on average, while Honey Gouramis are only 2 inches, making them the smallest fish of their group.

Another major difference is their body coloring. A Honey Gourami looks solid yellow, orange, red, or honey-colored. And a Dwarf Gourami looks red or blue and is paler. Other than that, Honey Gouramis have eyes closer to their mouths and Dwarf Gouramis don’t.

Lifespan

A Honey Gourami lives up to 8 years in captivity. In the wild, due to various reasons, they can’t keep predators and health problems at bay. And this results in shortened lifespans.

To improve the overall quality of life, gauging the right water parameters, as well as preventing them from taking stress, is important.

They thrive in freshwater with a temperature ranging from 74 to 82 F. But, there’s more to their basic requirements that we will discuss in more depth.

Average Size

The Honey Gourami is the shortest member of its family. Their maximum size is only 2.5 inches and, in some rare cases, 3 inches.

Like other freshwater fish, they take almost 2 years to reach their full size. The males are slightly larger than females – almost about an inch.

Care

As a novice, the hardest part is to go make water conditions ideal, the aquarium setup, dietary requirements, and finding compatible tank mates for the fish. Any shortcoming in fulfilling any of this can be dangerous for your fish.

Aside from giving a spectrum touch to your aquariums, a Honey Gourami can also withstand slight water condition changes. So instead of fussing over intricate details, you can actually think about starting your journey right away.

In your aquarium, you can replicate natural conditions and provide your Honey Gourami with a solid home. They thrive in warm water temperatures, ranging from 74° F to 82° F.

Because this hardy fish moves in groups, a larger aquarium is necessary for this active fish. Honey Gouramis are familiar with living around thick vegetation, so introduce thick plants to your tank.

Since Honey Gourami appreciates social gatherings and hardly shows any aggression, handling it becomes completely trouble-free for beginners. But, under certain circumstances, the male Honey Gourami is likely to become aggressive to its tank mates and females around.

Unlike other more sensitive freshwater fish, they are not susceptible to serious diseases. But neglect in managing them properly can be dangerous. Here are some essential things to consider before housing a Honey Gourami.

Aquarium Setup

The fish Honey Gourami hails from South Asia where the water tends to be slow-moving and warm.

In South Asia, specifically in India, Bangladesh, and Nepal, they inhabit rivers, lakes, and ditches and can also be found throughout flooded areas.

The waters of these fields are slightly acidic and moderate to high in hardness. Also, there are thick plants that work to provide them with shade and hiding spots.

Honey Gouramis flourish in a stress-free environment. So, try to mimic their natural habitat as closely as possible to stem the flow of anxiety.

Gouramis do their best solo or in pairs. If you pair them, make sure you give than a larger tank to curb aggression.

Because Honey Gouramis are active and prefer spending their time exploring their surroundings, jumping out of the aquarium is likely. To ensure their safety, keep a tight lid on the tank.

Tank Size

Since they are quite small, you don’t need to arrange enormous tanks for them. However, they are social fish and do not enjoy living alone. If you want to house only a pair of them, then a 15-gallon tank is ideal. But if want a group of 6 Honey Gouramis living together, go for a 30-gallon tank.

Water Parameters

Their ability to put up with subtle water changes is worth mentioning. But, they do need properly measured water parameters to thrive. Remember that they come from South India where the streams, rivers, and pond waters are usually warm.

While going over the water conditions, do not heat up the aquarium too much. It should be above 74° F and below 82° F, with water hardness between 4 to 15 KH. The pH levels should be around 6.0 to 8.0. And that’s ideal for them. Make sure ammonia and nitrite levels stay at 0. Keep your nitrates reasonable with under 30PPM being ideal.

Filtration/Aeration

Another key factor that leads up to the overall health maintenance of your Honey Gourami is filtration. Since the fish is small, it doesn’t produce a lot of waste. However, in groups and in planted tanks, there is more waste production to consider that would make a higher quality filter more appropriate.

I recommend using a strong filtration system to keep the water quality up to the mark. You can use a sponge filter or a hang-on-back filter to strain the water thoroughly. Also, regular weekly water changes (usually 20-50% depending on the bio-load) will keep your aquarium in a healthy condition.

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Honey Gouramis can’t withstand strong water currents. So, make sure any filtration system that you are using doesn’t disturb the water flow.

Lighting

You don’t need any artificial lighting for your Honey Gourami. A moderate amount of natural lighting is enough for the fish and plants.

But to keep a check on their day-to-day activity, you can use Led lights that are not too bright. Bright lights can disturb them and force them to hide in caves or under thick aquarium plants.

Aquatic Plants and Decoration

With staying mostly on the top areas of tanks, a Honey Gourami hardly travels down to the bottom. Therefore, live floating plants are ideal for them.

In the wild, a Honey Gourami uses thick leafy plants as a shelter. And since you want to make them feel at home, I recommend considering live aquarium plants for their tanks.

Unlike other fish species, you will never see your Honey Gourami attacking a plant. They might nip at the plants, but only because of curiosity.

They need plants to use as a hideout. Also, they build their bubble nests into plants, so make sure they have a good amount of floating plants in the tank.

Even though a Honey Gourami uses its labyrinth organ to breathe air if there is not enough of oxygen, other fish prone to low oxygen levels can’t do that.

Apart from filtering their water using strong filtering systems, live plants can help filter our excess nutrients like nitrates from their tanks.

In their natural habitat, Honey Gouramis travel to the surface areas of water to draw breath. While setting up their tank, don’t cover the surface completely with plants.

Some great recommendations for underwater and floating plants are:

• Wisteria
• Anacharis
• Java Fern
• Anubias
• Hornwort
• Java Moss

Pro Tip: Avoid using too many plants and manufactured caves. This will result in preventing you from keeping a check on them.

Tank Maintenance

Cleaning the tank of your honey Gourami is totally hassle-free. These small fish feature so many irresistible characteristics that make you fall in love with them.

Because the fish prefers to live in a thickly planted aquarium in groups, cleaning their tank is more than necessary. Here are some simple steps to get you started.

How to clean the tank?

1. Start off with cleaning the walls with an algae scrapper.
2. Trim the plants occasionally and take out the clippings.
3. Clean decor and plants with a soft toothbrush.
4. Skim surface of the substrate if sand is used and gravel vac if gravel is used. Avoid uprooting plants

Pro Tip: During the breeding season, make sure you don't damage your Honey Gourami's bubble nest while cleaning the plants.

Substrate

Creating a substrate that mimics their natural environment is as essential as other things. While they adhere to the middle and surface levels, you still need a good substrate for this labyrinth fish.

Layer the base of the tank using fine grains of the substrate. You can use both sand and gravel to create the base. In the wild, you can find plenty of rocks, plants, and driftwoods. Keep that in mind while creating their substrate.

Keep the substrate at least 2 inches deep. And make sure underwater plants or decorative items are firmly fixed on it.

Pro tip: A dirty substrate can make the aquarium cloudy. So, clean it beforehand to avoid any issues.

Community Tank Mates

Honey Gouramis are shy and need considerable time to blend in with their tank mates. They are peaceful fish and can easily get along with a good range of fish species.

But since they are reserved, pay great attention to the species you will house them with. Their ideal tank mates should not be fin nippers. Also, they are quite small, so choose a fish that can can’t fit them in their mouths.

They are social and humble but can act aggressively, especially males. If the amount of food that you are putting in isn’t enough, you will see the males hostile towards their mates. So it is good to focus on these areas.

Here’s a list of some great tank mates for your Honey Gourami.

1. Rosy Barb
2. Dwarf Barb
3. Cherry Barb
4. Sparkling Gourami
5. Cory Catfish
6. Zebra Danio
7. Celestial Pearl Danio
8. Kuhli Loach
9. Oto Catfish
10. Ember Tetra
11. Rabbit Snail
12. Mystery Snail

Poor Tank Mates

As much as they are good at grouping up with different fish, they are small and thus an easy target for these fish species.

1. Cichlids
2. Red tail Sharks
3. Rainbow Sharks
4. Paradise Fish
5. Betta Fish
6. Tiger Barbs

Breeding

Breeding Honey Gouramis is pretty simple and intriguing. In this guide up till now, I have walked you through their origin to their aquarium setup. And now comes the most important part.

Unlike the complex details of Betta fish breeding, the breeding requirements of the Honey Gourami are fairly simple for a beginner. Honey Gouramis are sexually dimorphic, which means there are visible differences between a male and a female. Here is a video above by Todor Vankov that shows the cycle.

But before we get started, make sure males and females are equal in amount. If there are too many males, they will start fighting one another to win over the limited females.

Purchase a separate breeding tank for them. A 10-gallon water tank is ideal. While setting up their breeding tank, keep the water 6 to 7 inches high.

Then, heat up the water up to 84° F. You can either use a heater for that or go for a towel to cover the surface. Keep the acidic level at 7.0 with the water hardness around 8 KH.

Apart from gauging the water conditions, feed them a good-round diet.

Also, introduce thick vegetation to the breeding tank throughout. Males will use them to build a bubble nest.

Before spawning, the males become more vibrant and develop a deep black or light brown stripe. The stripe is apparent from their heads to the end. You can also see its throat turning deep blue, which is a clear spawning indication.

Before approaching a female, the male will build a bubble nest. Once the fish is done, it will start swimming around the female until she is convinced to follow him to the bubble nest.

At the time of spawning, the male will hold the female to prompt spawning. Once the female swells with eggs, it will start laying eggs in water. The male will instantly catch the eggs with his mouth to lay in the bubble nest.

After they are done spawning, separate the female. Even though Honey Gouramis are not aggressive fish, males tend to show hostility towards the mothers. They are possessive and don’t appreciate anyone around the eggs.

Female Honey Gourami can lay up to 300 eggs in different spawning rounds. The male monitors them and fertilizes the honey gourami eggs, which takes 2 to 4 days.

The fry will start swimming after 2-3 days and it is good to remove the male at this point. Because the babies are puny, they need to be looked after properly. Once the larvae is hatched, they will use their yolk sacs for a couple of days.

Start feeding them infusoria and liquid fry food after a week or two. Once they are bigger and stronger, give them access to baby brine shrimps.

If you want to ensure a solid growth of the labyrinth organ, I recommend covering the aquarium surface with plastic wrap. This will increase humidity, leading to proper labyrinth organ growth in babies.

Food and Diet

In the wild, they are fed on a variety of diets. Even though they are omnivorous fish, you can call them carnivorous fish, too. Because they can consume both plants and protein-filled foods.

Honey Gouramis love to see variations in their diet. So, making them happy while keeping honey gouramis healthy at the same time holds great value.

To boost their longevity, give them a mixed diet of vegetables and meat. Some great recommendations for vegetables are vegetable tablets, plant material, lettuce, and cucumber. While trimming the plants, you can offer them that, too. This will help you prevent them from attacking the plants.

But meaty foods remain the core diet, so don’t skip that. You can give them bloodworms, white worms, mosquito larvae, flakes, pellets, and brine shrimp. Fluval bug bites are a great staple and will enhance their color.

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While baby brine shrimp is the primary source of protein for baby honey gouramis, you can you large brine shrimps for adults.

As compared to other fish, they are shy. Other fish who are fed on the same diet can easily eat off their share, leaving them starving. While feeding the fish separately is almost impossible, you can make changes to their timings.

Lastly, feed them twice or thrice a day, and notice that they finish the food odd within 3 minutes.

Common Health Problems

They can withstand environmental changes, but their labyrinth organ is sensitive to drastic temperature shifts.

An unclean water tank can lead to a bacterial infection called fin rot. There are other diseases too that they are prone to. To keep these ailments at bay, keep the tank clean and manage the diet as recommended.

Fin Rot

They are susceptible to fin rot, a common disease caused by unclean water.

The symptoms are:

1. Black, while or brown spots on fins or other body parts.
2. Inflammed skin
3. Lethargy
4. Loss of appetite

Ich

This is a common fish disease. Honey Gouramis are resilient, but other fish suffering from ich can easily affect them.

The symptoms are:

1. White spots on the body
2. Scraping the body against the aquarium surface

Velvet Disease

Velvet disease primarily occurs due to the presence of parasitic dinoflagellates.

The symptoms are:

1. Scratching against rough objects or surfaces
2. Loss of appetite
3. Loss of color
4. Clamped fins

These ailments can be avoided if you maintain water quality and keep overall health preservation. Velvet spreads rapidly and, in case your honey gourami is affected, isolate it from other fish.

FAQs

Closing Thoughts

If you’re looking for a peaceful, colorful fish to add to your community tank or planted aquarium, the honey gourami might be perfect for you. These little guys are social and get along well with other fish, making them an ideal choice for those who want a lively tank without any drama. Have you kept honey gouramis before? Let us know your experience in the comments!

📘 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.

Neon tetras are probably the fish I’ve recommended most often to beginners over my 25+ years in the hobby — they’re affordable, peaceful, visually stunning in a school, and reasonably hardy once established. The caveat I always give: they are more sensitive during the first few weeks in a new tank than most people expect. They don’t tolerate ammonia spikes well, and neon tetra disease is real and can wipe out a school fast. Get the tank cycled properly, quarantine new arrivals, and keep them in groups of at least 6 — do those three things and they’re one of the most rewarding fish you can keep.

Species Overview

What Is A Neon Tetra?

Neon Tetra is a small to medium-sized tropical fish that belongs to the Characin Family. They are beautiful freshwater, hardy fish, known for their peaceful nature. Neon Tetras are schooling fish that do well in a group of 10 or more. There are many types of Neon tetras and each of them is equally amazing. They usually come from soft, acidic water from the Amazonia.

Different Types

Here are some of the most common types of Neon Tetra.

True Breeds

True Neon tetra or wild neon tetras are blue and red with silver white color. They possess bright blue color on both of their sides, i.e., from their eyes to the adipose fins. Their body is of red color from the anal fins and exceeding to the tail with transparent fins and tails.

The wild neon tetras or True neon tetra have a silver and white body that grows no longer than 1.2 inches. These are peaceful fish, smaller in size, and enjoys the company of at least 6 other fish. They usually occupy the middle tank levels.

Long Fins

The long fin neon tetra is a captive variety of neon tetras that are similar in appearance to true neon tetra. However, they have long fins twice the length of true neon tetra. Besides the size of their flowy, long fins, the long fins of neon tetra are identical to true neon tetra in terms of their appearance, lifespan, or living water conditions.

Gold Head

Gold neon tetra or glowlight neon tetra has a red and silver body with beautiful blue eyes and a gold-red stripe running from its snout to the tail. Despite their beautiful patterns, they are leucistic, i.e., their bodies are transparent with a peachy silver hue.

Diamond Neon Tetras

These tetra species possess a diamond-shaped patch on the back of their bodies, between their eyes and a dorsal fin. Hence, the name. Diamond Neon tetra is a product of selective breeding and many buyers prefer to buy them with they are adults since juvenile diamond tetras are bland in color. However, as they grow, they develop beautiful colors that are appealing to the eyes with horizontal blue stripes and red stripes down their bodies.

Black

They are commonly called black neons only. These species of neon tetra have a unique and striking appearance with an orange-colored semi-circle above their big eyes. Two horizontal lines run from their gill cover to the caudal fin. One line is black while the other one is bluish white. The entire body of black neon tetra is greyish brown with shimmery marks of yellow and green.

Red

Red neon tetra or Cardinal tetra has an uncanny resemblance to the true neon tetras, but they are slightly longer than the true neons. Cardinal tetras have blue stripes that run from their eyes to the tails. There is a red stripe below the blue stripe which extends from the head to the tail.

Green Tetra

False neon tetra or Green Neon tetras are often confused with their close cousins; Cardinal tetras or true neon tetra because of their overall appearance. They have a light red color on the lower part of the body like neon tetras while the upper part has a bluish-green color that looks gorgeous. The head and back of the green tetras are also green colored, hence, the name.

Origin and Habitat

Neon tetras come from the tropical areas of Amazonia which makes them tropical fish. Neons prefer warm water and they originate from Western Brazil, South America, Southeastern Columbia, and Peru.

However, the wild bred variety of neon tetras lives in headwaters of the River Amazon, Tiger, Napo, and Yarapa. In their natural habitat, they can be found in clear water streams or blackwater. But mostly, neon tetra is now commercially bred.

Appearance

Neon tetras are graced with a light blue black and silvery white abdomen. The bodies of Neon tetras are spindle shaped with a blunt nose. From the base of the adipose fin to the close runs an iridescent blue stripe and from the middle body to the base of the caudal fin runs an iridescent red stripe.

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The anal fins of Neon tetra are almost transparent and most neon tetras develop an olive green shimmery lining on their backs. The most prominent feature of neon tetras is when at rest, the fish becomes silver and when it is active during the day, it again becomes red and blue.

Average Size

The neon tetra is a small, peaceful fish that grows no longer than 1.2 inches in length or 3 centimeters.

Lifespan

Neon tetra species are an investment because they have a great life expectancy when provided with optimal water parameters and tank conditions. A healthy neon tetra lives for up to 8 years or longer in captivity.

Tank Care Guide

Neon tetras are hardy fish that can withstand varying water parameters and tank conditions. However, when it comes to the cleanliness and hygiene of your tank, neon tetras are no exception. Neon tetras need crystal clear, bacteria-free water to do well in your home aquariums.

Therefore, to keep your neon tetra happy and healthy, follow this guide.

Aquarium Setup

Since neon tetra is a schooling fish, they should be kept in a group of 10 fish. However, a group or shoal of at least 10 neon tetras is highly recommended to avoid stress and aggression in your fish. Also, neon tetras live in the mid-upper levels of the tank. Therefore, choose plants and other fish species accordingly.

Tank Size

If you’re keeping neon tetras in small numbers, for example; one or two fish in a single tank, then size doesn’t matter. They are such small fish that can easily fit into a 2 or even 1-gallon tank.

However, as mentioned above, neon tetra is a shoaling fish that enjoys the company of other fish. Therefore, for keeping a group of 10 or more, I recommend a bare minimum of 10-gallon tank size. Also, as they are mid to upper-level swimmers, a taller tank works the best than a wider one.

Water Parameters

In their natural habitat, neon tetra enjoys slightly acidic water with a water temperature of around 70-79°F. The pH of South American regions is more or less 6.8. Thus, they should be provided with similar water parameters to ensure their health.

Water Temperature: The ideal water temperature range is around 73°F to 78°F.

pH range: The recommended pH range for an aquarium tank is between 6 to 7.

Water Hardness: The neon tetra prefers soft and slightly acidic water with a water hardness of no more than 10 dGH.

Filtration and Aeration

Neon tetra, in the wild, is a very hardy fish. However, in captivity, you need to take care of their ecosystem since they develop fatal diseases detrimental to their well-being. Therefore, proper filtration and aeration in a fish tank are essential.

Many aquarists use air pumps to promote aeration. They are okay to use, however, not necessary. If the air pump becomes a necessity, the reason is you have overstocked your fish tank. Air pumps create bubbles in the water and break the surface tension. But there are more easy ways to promote aeration in your tank. These are:

1. Aquarium Filter: Aquarium filters are excellent to promote aeration and oxygenation in the tank. For maximum aeration, I highly recommend getting a filter that is powerful enough for your neon tetra tank.
2. Powerheads: Powerheads supplement your aquarium filter and are usually placed on the side of your tank, connected to an air hose. They add water movement and promote aeration in your fish tank.
3. Spray Bar Aerators: Spray bar aerators are attached to your filter outlet that sprays the water. They are fitted in the tank horizontally. I highly recommend space bars if you have dead spots in your aquarium.

Best Aquarium Filter for Them

Neon tetras are small fish that need a lot of oxygen in their tank. Without proper aeration and oxygenation, neon tetras will suffocate to death.

The recommended filters for a small fish like neon tetra are a sponge filter or a hang-on back filter. However, if you have a larger community tank with lots of fish and plants, I recommend canister filters.

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The best filters for neon tetras are those that perform biological, chemical, and mechanical filtration and provide movement in the water. I also recommend a drip filter that creates a waterfall effect and promotes oxygenation.

Pro Tip: While installing a filter, make sure you cover the intake as neon tetra is a small fish that can easily be sucked into the filter.

Lighting

In their natural habitat, neon tetra lives in brackish or blackwater. And so, thousands of leaves cover the river streams making their ecosystem dimly lit. We also suggest mimicking their natural environment to keep them happy. Thus, a dimly lit aquarium is the best bet for your fish.

If you have aquatic plants, make sure to get those that thrive in low light. Otherwise, you can get floating plants that cast dark shadows on your fish.

Aquatic Plants and Decorations

Neon tetra appreciates a densely vegetated aquarium. Also, aquatic plants help in the breeding tank while mating and spawning. In a community tank, neon tetras like to swim freely in groups where they feel safe. However, when they feel threatened, they like to hide in plants and other decorations. Therefore, aquatic plants are necessary for the neon tetra tank.

I recommend keeping tall plants, i.e., Ludwigia repens, Brazilian pennywort, vallisneria, cabomba, or Cryptocoryne wendtii. Floating plants also add great colors to the aquarium and provide them shade from direct sunlight. I recommend frogbit, dwarf water lettuce, or red river floaters.

Live plants also help filter out the water by removing nitrates from water. Additionally, for plant decors, you can get driftwood, logs, and castle with hiding places and bubbles to adorn your aquarium.

Substrate

Neon tetra fish is not finicky about substrates because they are mid to top level swimmers that rarely settle in the bottom.

However, avoid using Aragonite sand as a tank substrate. That’s because it is made of Calcium Carbonate which will increase the calcium and carbonate levels in your tank and mess up your fish ecosystem. If you opt for a densely planted tank, consider using a planted tank substrate.

Community Tank Mates neon tetras

The neon tetra is a small and non-aggressive fish that get along with other fish similar in size and temperament. Also, neon tetras are top to mid-level swimming fish, make sure to add the tank mates that are mid to top-level dwellers.

The best community tank mates for neon tetras are:

1. Harlequin rasboras
2. Zebra Danios
3. Hatchetfish
4. Guppies
5. Chili Rasboras
6. Dwarf Gourami
7. Zebra Loach
8. Corydoras Catfish
9. Kuhli Loach
10. Otocinclus Catfish
11. Clown Pleco
12. Bristlenose Pleco
13. Freshwater shrimp

I don’t recommend keeping neon tetras with large, aggressive fish of around 3 to 4 inches in size that may bully, harm, or eat your neon tetras.

Breeding

Many aquarists struggle breeding neon tetras in their home aquariums because to breed neon tetras, you need special water conditions that should be followed religiously. In a breeding tank, the water temperature should not exceed 75 degrees. Also, the breeding fish in the tank should be separated from other fish. The eggs and fry of neon tetra are photosensitive, therefore, little to no light should be available.

In essence, you cannot breed neon tetras in the same standard tank. Thus, invest in a separate tank to breed neon tetras. The video above by KeepingFishSimple offers a unique method of breeding these fish.

Setting up a separate breeding tank

First of all, before breeding neon tetras, feed them with high-protein live food at least three days prior to breeding. You can feed them brine shrimp, tubifex worms, and bloodworms to achieve initiate the spawning cycle. 

1. Prepare at least a 5 to 10 gallon tank with a lid and leave them in the tank for a full day
2. Maintain the proper water parameters. The water should be soft and slightly acidic with a pH of 6.0 to 6.2
3. Install the heater to maintain the water temperature at 75 degrees. Invest in an aquarium thermometer to closely monitor the temperature.
4. Keep the breeding tank densely vegetated with floating plants like Hornwort as neon tetras are egg scatterers and scatter their eggs onto the plants. Also, keep your tank in a dark or dimly lit room
5. The eggs of neon tetras release early in the morning and the fish tend to spray the eggs onto the plants. Once you identify neon tetra eggs, remove the breeding fish from your tank as neon tetras eat their own unhatched eggs
6. The eggs of neon tetra hatch in around 22 to 30 hours and in 3 to 4 days, the fry will be swimming freely. The neon fry should be fed infusoria or some other liquid-prepared fry food as soon as they start swimming
7. Once the fry gets bigger, you can switch their diet to freshly hatched brine shrimp, powdered eggs, or fry food
8. Once the neon tetra fry is almost a month old, you can feed them regular adult neon tetras food

Food and Diet

Neon tetras eat everything since they are omnivorous. In the wild, they eat everything that fits their mouth—algae, larvae, shrimps, and other food.

However, captive-bred neon has a varied diet that is high in protein to ensure healthy colors and a longer lifespan. I recommend feeding neon tetras with a balanced, high-quality flake or frozen foods, and sinking micro pellets as these fish are small. You can also treat your neons with freeze-dried or frozen foods such as bloodworms or frozen brine shrimp.

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Pro Tip: The fry of neon tetras should be fed with infusoria and after a few weeks, you can feed them baby brine shrimp, powdered eggs, or powdered fry food.

Here’s a list of neon tetra food you can feed neon tetras without worry.

• Brine Shrimp
• Earthworms
• Maggots
• Daphnia
• Frozen Blood Worms
• Fish Flakes
• Tubifex Worms
• Mysis Shrimp
• Cucumbers
• Grapes
• Strawberries
• Chicken
• Fish
• Egg Yolk
• Beef

Common Health Problems and Disease

Though many aquarists believe neon tetras are hardy. However, for novices, it can be a challenging pet. That’s because neon tetras are blackwater fish that are easily killed by bacterial infections. Also, overbreeding has led to weaker less hardy strains of neons.

These diseased fish often shows no symptoms of illness. Therefore, neon tetras need crystal clear and clean water that is only possible with mature aquarists in mature aquarium settings with a proper filtration system and substrate that is uncleaned for at least two months.

How To Cope-Up With Disease

Seasoned aquarists seldom experience any neon tetra disease problems because they know how to raise them well. Neon fish thrive in bacteria-free, crystal-clear water with exceptional aeration. However, if you keep neon fish in a tank teeming with bacteria, they will die rapidly because their immune system is vulnerable to bacteria.

Here’s how you can fight neon tetra disease.

1. Over-filter your tank with a canister, sponge filter, or a hang-on back filter.
2. Keep your neons in the tanks that are established for over five months.
3. Keep the water crystal clear and clean. Do regular water cycling and keep track of aeration.
4. Install an in-line UV unit.

Here are some of the common neon tetra diseases.

Disease

Named after neon tetras, this disease is not only limited to neon tetra fish. However, it was first diagnosed in a neon tetra fish. Unfortunately, it can be devastating to have a fish with neon tetra disease in a community tank because it is fatal and affects almost all fish of varying sizes. This disease is usually spread by a diseased fish in an aquarium. Thus, quarantining your new fish before introducing it to a community tank is the best thing to do.

If you come across any fish with neon tetra disease, remove it from the fish aquarium before it dies. The spores in your aquarium tank cause neon tetra disease. Thus, careful cleaning and regular maintenance are imperative to avoid these diseases,

Symptoms of Neon tetra disease:

1. Restlessness at night
2. Erratic fish swimming behavior
3. Fish becomes inactive and lethargic
4. Loss of colors on fish’s body
5. Formation of cysts in muscles
6. Curved spine

Cotton Wool Disease

The cotton wool disease is caused by fungal infections in the fish. It happens when two fungi, Saprolegnia and Achyla, affect your neon tetra’s immune system. The first sign of the cotton wool disease is the white fluffy appearance like a bulge on their mouth. As the infection worsens, it becomes grey or red in color. 

Symptoms of Cotton Wool Disease:

1. Loss of color around the mouth
2. The cotton-like abnormal bulge on their mouth
3. Lethargy and less movement
4. Loss of appetite and solitary behavior

Fish Tumor

Many aquarists confirmed that neon tetras can get tumors that appear as lumps or bumps on the fish’s body. Therefore, if you notice abnormal growth on your fish’s skin, experts recommend removing it from the tank before it spreads to other fish in the tank.

Symptoms of Fish Tumor

1. Pea-sized growth on the mouth
2. Difficulty in breathing and eating

How to Prevent Diseases in This Type of Fish?

Prevention is always better than cure and to keep your neons away from diseases, maintain optimal water conditions and check your fish’s health while buying from the fish store. I highly recommend buying fish from fish farms or a reputable supplier. Once you get your fish, keep it quarantined for at least two weeks before transferring it to the community tank. Also, always get your fish food supplies from a reputable source.

The foremost thing to do is to maintain a healthy environment in your tank. It is recommended to clean your aquarium every week. Also, change your water anywhere from 15 to 50 percent depending on your water parameters. This will keep your nitrate levels low and keep your fish healthy.

Differences Between Male and Female

The differences between male and female neons are close to none. However, female fish is usually bigger and bulkier than males with more round bodies. Also, the male fish has a straight blue line on their bodies while the blue stripe on the female fish is more bent.

FAQs

Final Thoughts

There are many types of neons—all with a peaceful nature and vibrant, enchanting colors that are pleasing to the human eyes. The Neon tetra fish is small and colorful that makes a beautiful addition to your home aquariums. However, they come from blackwater that is low of bacteria, so, you should aim to mimic their natural environment to provide them with the best living conditions that they will cherish for the rest of their adorable lives.

🐟 This article is part of our Tetras: Complete A-Z Species Directory — your guide to every tetra species in the hobby.

Black neon tetras are one of those fish I always find myself recommending when someone wants an alternative to the standard neon. I’ve kept them in planted community tanks and they’re genuinely low-maintenance — hardier than regular neons, peaceful, and that black-and-white stripe looks great against green plants. Here’s everything you need to keep them healthy long-term.

Black neon tetras (Hyphessobrycon herbertaxelrodi) are a genuinely underrated alternative to the standard neon tetra — they’re hardier, more adaptable to varying water parameters, and in my opinion more elegant-looking. That horizontal black-and-gold stripe against a darker body is quietly striking in a planted tank, especially in a school of 10 or more. If you’ve had trouble keeping regular neon tetras healthy, black neons are worth trying — they’re significantly more resistant to the common issues that plague standard neons. Here’s the full care guide.

An Overview of Black Neon Tetras

What are Black Neon Tetras?

Black Neon Tetras, scientifically recognized as Hyphessobrycon herbertaxelrodi, are part of the Characidae family from the order Characiformes.

In the aquarium trade, their generic names are Black Neon Tetra, Neon Black, or Black Tetra. Regardless of which name of Black Neon tetras you use, they know how to make their way around.

In the wild, the Black Neon tetras sustain themselves on brine shrimp, algae, and bloodworms and prefer traveling through middle and upper levels of water.

Origin and Habitat

Originating from the basins, small rivers, and flooded forests of Brazil and Bolivia, Black Neon Tetras are now housed in aquariums across the world. They were first sighted in 1936 by the American Ichthyologist George Sprague Myers. Ever since their classification, they have never failed to amaze aquarists.

The streams of their natural habitat are stained brown because of tannins or decaying plant matter. In their natural habitat, Black Neon Tetras prefer warmer levels of water, ranging from 70° to 82° F. And stick to small rivers and inlets where, in some localities, you can find dense plants.

The water current of their natural habitat is low-to-moderate and slightly acidic, with a pH level ranging from 5.5 to 7.5.

Appearance

These small, little Black Neon Tetras give a much more beautiful touch to your tank water with their overall body coloring than other tropical fish.

They got their name after their base body color and neon stripes. From the pair of these two bars, the first one is a white stripe that looks shimmery, followed by a thick black stripe.

The foot color of their bodies is velvety black and on top of the base color are two strikingly beautiful-colored bands. These stripes run horizontally from their gill cover to the end of their tail fin. Apart from being beginner-friendly, they seize the attention of aquarists with their physical appearance.

Compared to the small size of the Black Neon Tetra, its transparent fins, including caudal, dorsal, and pelvic pin appear somewhat larger.

The Black neon tetra has a rounded mouth and rounded head and looks sleek in appearance. Female Tetras, however, look fuller from their bottoms and their underbellies look more prominent while being pregnant.

Differentiating a male Black Neon Tetra from a female Black Neon Tetra is almost impossible. They are so small and you can’t see any other apparent sign of gender difference other than knowing the female is larger.

Lifespan

The average lifespan of a Black Neon Tetra is around 5 years in captivity. In their natural habitat, adhering to health and fitness is hard. Therefore, some of them only make it up to a few months.

You can replicate those conditions in the tank. For a healthy lifestyle, give them a good-round diet and a peaceful environment.

The Black Neon Tetra is a hardy fish and can survive uneven water parameters and non-ideal water quality. But, failing at meeting their basic needs can put them through stress and cause fatal diseases.

Average Size

The size they get is around an inch. Some of these fish can grow a maximum size of 1.5 inches in aquariums. In the wild, they can stretch themselves up to 2 and a half inches, but this size is usually not attained for captive-bred fish to reach.

Care

There are no special care requirements for a Black Neon Tetra. They are very easy-going, suitable for community aquariums, and eat pretty much everything you put in their tank. From flakes, bloodworms, and brine shrimp to frozen-dried food, these beautiful fish prefer a variety of easy-to-get foods to consume.

As long as you understand their natural behavior, needs, and things essential for them to thrive, you will have a good time handling them.

Black Neon Tetras prefer streaming in moderate water currents. The water does not have to be crystal-clear because they live in brown-stained water that is above 70° F and below 82° F in the wild.

Have at least a 20-gallon tank for Dark Neon Tetras. They might look too small for the tank, but they are schooling fish and live in groups of 6 to 10. Larger tanks will allow them to demonstrate their best natural behavior.

Also, a large tank, ideally a Biotope aquarium, can give them enough swimming space to enjoy their me-time and still conduct group gatherings.

Black Neon Tetras sustain themselves on crustaceans, algae, and insect larvae in their natural environment.

They are schooling fish and very amiable, and living alone can easily stress them out. So, keep at least half a dozen of them together, which is actually the bare minimum.

Black Neon Tetras stay active throughout the day and take rest during the night. And it’s very unlikely for them to show signs of aggression or hostility. They prioritize healthy company over solitude and love extending their company with their community tank mates.

Like other fish, Black Neon Tetras are also susceptible to some common diseases. But don’t worry!

Here are some really important things to consider before adding a Black Neon Tetra to your aquarium and how you can avoid unpleasant events in the best way possible.

Aquarium Setup

The key to pleasing your Black neon tetra is to replicate their natural environment as closely as possible.

In the wild, Black Neon Tetras live in small creeks and shallow streams full of plants. These plants provide them shade under where they can rest all through the night. And during the day, they hurtle through acidic water and look around for food.

Black Neon Tetras hardly travel down to the bottom and spend most of their time remaining in the upper levels.

The type of water Black Neon Tetras live in contains decomposed plant matter, which gives way to tannin. The tannin then makes the water brown and highly acidic.

Even if their natural water conditions are not well regulated, try replacing them with something more convenient while constructing their habitat.

Tank Size

To ensure that your Black Neon Tetra is living a quality life, tank size is as important as any other factor involved in their fitness.

Black Neon Tetras live in groups. So technically, they need larger tanks to swing around at their own pace.

The minimum tank size is 20 gallons for a Black Neon Tetra, but the number can go up to 40 gallons if there are other community tank mates with them.

Pro tip: Black Neon Tetras are pros at jumping out of the tank. To ensure their safety and stop them from displaying their jumping skills, secure the tank with a lid.

Water Parameters

Contrary to what most people believe, the water in their native homes is not clean or transparent. Instead, it is tea-colored, high in pH levels, and filled with decaying plant matter.

While creating their aquarium, gauging the right parameters is important to keep your Black Neon Tetra healthy. They prefer swimming in moderate water currents. So, make sure the current is not too low or too high.

The water temperature should be between 70°F to 82°F degrees, with the water hardness around 6Kh. Black Neon Tetras in their habitat survive disturbed acidity levels. To keep these problems away from intruding on your fish, keep the water parameters similar to what they are naturally intimate with.

Pro Tip: A Black Neon Tetra that is newly introduced to the aquarium can have a hard time adapting to the environment. It's better to keep checking on them every now and again and see how they progress through the first days.

Filtration and Aeration

Filtering out the water frequently is another important factor that leads up to their overall physical fitness.

Even though Black Neon Tetras are tiny and don’t produce too much waste, the cumulative waste of 6 to 7 tetras is enough to pollute the water. If you don’t weed out the waste material on time, your Black Neon Tetras will end up with high ammonia and nitrate levels.

Once a week, strain out at least 25% of water and add fresh water to their tanks. Also, purchase a strong filtration system like a hang-on-back filter or a canister filter.

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Pro Tip: Keep at least 60% 75% water in your tank while cleaning out the dirt or waste. Drastic changes in water can be fatal for your fish.

Lighting

Black Neon Tetras don’t expose themselves to luminous lighting. In fact, Neon Tetra eggs are extremely sensitive to brightness. Also, in the dull light, their bands look more prominent.

So, try to keep the aquarium’s light of your Black Neon Tetras subdued. You can use low LED light to make the tank dimly lit. But make sure the aquarium is not completely deprived of natural lighting because it keeps the plants healthy.

Aquatic Plants and Decorations

As with most Tetras, filling your tank with dense live plants is crucial to making Black Neon Tetras feel at home. The regions they call home contain rotting plants, driftwoods, and twisted roots.

Despite their preference for staying close to the surface of their tank, they still explore their surroundings.

They conduct their family gatherings, do food hunting and keep themselves floating around during the morning hours. To recharge their energy, they travel to the bottom levels at night. Adding caves to the tank will allow them to do that.

Some great recommendations for live plants are Java Moss, Brazilian pennywort (one of the best floating plants), Amazon sword, Cabomba, Vallisneria, Cryptocoryne wendti, Anubias nana, and Ludwigia repens.

Not only these plants will add up to your aquarium beauty, but they will also keep the water oxygenated and free from ammonia.

Pro Tip: Place plants in the tank at a fine distance from one another so the fish can easily roam around and explore.

Tank Maintenance

You don’t need to fuss over cleaning their tanks. It’s easier than you think. Here are some really easy tips to get you started.

How to clean their tank

1. Start cleaning off debris from the substrate using a gravel vac if the substrate is larger. Skim the surface if you use sand.
2. Rub the wall sides of the tank with a soft brush. Use a scraper for the rest of the glass
3. Clean the plants and other decorative items. Use a soft brush for plants and decor

Substrate

Layer the bottom of their tank with dark sand substrate. Introduce plants to the foot of their habitat to give them a homely taste. Leaves, similar to their role in the wild, will make the water brown and increase the pH levels. Change the leaves from time to time and place twisted roots on the sub-substrate, too.

Community Tank Mates

As I mentioned earlier, Black Neon Tetras can easily get along with a variety of fish species. They love being around fish from their tetra species, but you can also pair them up with other fish.

Except for certain situations, they never display aggression or other behavior issues while being with other fish species. But avoid placing them with aggressive fish or any large fish that can turn them into its meal.

Here’s a list of some compatible tank mates from their own species, Tetras.

1. Small Freshwater Catfish
2. Chili Rasbora
3. Dwarf Gourami
4. Harlequin Rasbora
5. Celestial Pearl Danio
6. Honey Gourami
7. Rummy Nose Tetra
8. Sparkling Gourami
9. Freshwater Aquarium Nails
10. Neon Tetra

Poor tank mates

Housing your little Neon Tetra with any large or aggressive fish is not certainly a good option. The temperament Black Neon Tetras has is quite pleasant, but not every fish can will align with their nature.

Here are some incompatible tank mates:

1. Freshwater Sharks
2. Most Cichlids
3. Large aggressive fish
4. Nippy fish like Tiger barbs

Breeding

Preparing the groundwork to breed them is pretty simple if the water hardness, acidic conditions, and temperature are gauged accurately. The overall water parameters, a diet composed of live foods, and keeping the tank dim are enough to trigger them to breed (video source).

Other Tetras and Black Neon Tetras are alike in spawning. They need open water to release their eggs and milt.

To encourage the spawning season, prepare a separate breeding tank for the male Neon Tetras and the female Neon Tetras. After setting up their breeding tank, cover the surface with a towel or something else suitable for the purpose and raise the temperature. The temperature should be around 79° F to 80° F.

Feeding them live foods, as well as paying attention to other factors important for activating the spawning conditions, holds great importance.

As discussed earlier in the article, the females look fatten from their abdomens, which shows they are pregnant. The only difference between a pregnant female and a non-pregnant fish is the fulness of their abdomens. The former looks more pronounced from the belly.

You don’t need to have a large spawning tank for them to breed. A 5 to 10-gallon tank is enough for the breeding pair.

Black Neon Tetras are egg layers. In the separate tank, the female needs a spawning site for fry to attach. If you don’t have one, you can create it with fine-leaved plants. As an alternative to fine-leaved plants, get a synthetic analog that is easier to clean.

Also, cover the surface with something to protect the eggs from falling. You will also need to protect them from their parents because of their poor parenting instincts.

The mother fish will lay hundreds of eggs and will attach them to the substrate. Within 20 to 30 hours, the eggs will hatch.

Now comes the baby Neon Tetras. Until they are large enough to eat, they will survive on their egg sac. After that, feed them baby brine shrimp and keep them in a different tank until they grow large enough to further grow among the adult Tetras.

Food and Diet

They are pretty good with almost everything you put in their tank. In the wild, they sustain themselves on small crustaceans, filamentous algae, and invertebrates.

In the aquarium, feeding Black Neon Tetras is quite easy. You can give them brine shrimps, very fine fry food, mosquito larvae, or frozen bloodworms.

To keep your fish healthy, adding some vitamins like Vita Chem into their diet will positively affect their overall growth and activity.

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Common Health Problems

Like other tropical fish, Black Neon Tetras are also susceptible to common health problems. They are hardy and can put up with rough conditions, but here are some pathological conditions you might see them fighting with.

Ich

Most fish species get infected with Ich due to stress. Larger fish in the tank or not having a home-resembling environment can stress out your Black Neon Tetra.

The symptoms are:

1. Loss of appetite
2. White spots on the gills or other body parts
3. Abnormal hiding behavior

Dropsy

This is another common health problem in tropical fish species.

Symptoms include:

1. Loss of appetite
2. Lethargy
3. Swelling of stomach
4. Unusual floating at the top

Neon Tetra Disease

Your fish is likely to get infected by a disease called Neon tetra Disease. This disease was first found in Neon Tetras. Fish suffering from Ich are more prone to this ailment.

Symptoms are:

1. Cysts
2. Difficulty to swim
3. Segregation from tank mates
4. Curving of the spine

From the first two ailments, Neon Tetras can easily get cured, but there’s no cure for Neon Tetra Disease. To stop it from spreading, separate the infected fish from the healthy ones.

FAQs

Closing Thoughts

Neon tetras are a great choice for any tank, but they can be particularly beneficial in planted and community tanks. They are hardy fish that will add color and activity to your tank without disrupting the peace. Have you ever kept black neons before? Let us know your experience in the comments!

📘 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.

🐟 This article is part of our Tetras: Complete A-Z Species Directory — your guide to every tetra species in the hobby.