Tag: Freshwater

Bottom feeder fish are some of the most useful additions you can make to a freshwater community tank, and I’ve kept most of the popular species over the years. The biggest misconception I run into is that they’ll “clean the tank” on their own. they won’t. They’re excellent at their specific jobs, but they still need proper feeding, appropriate tankmates, and the right substrate to thrive.

Bottom feeder fish are among the most misunderstood in the freshwater hobby. and that misunderstanding leads to a lot of preventable problems. After 25 years keeping fish, the thing I hear most often from beginners is that they added a pleco or a cory to “clean up” the tank. It doesn’t work that way. Bottom feeders need to be actively fed just like every other fish, they have specific substrate requirements, and some of them get far larger than their tank can support. This guide covers 9 of the best bottom feeder species for freshwater aquariums, with honest notes on what each one actually needs rather than what the pet store might tell you.

What Are Bottom Feeders?

Bottom feeder fish are fish that spend most of their time at the bottom of the tank. Bottom feeders are some of my favorite species out there because they often have very interesting looks and behaviors.

Some species are fast and active, but many can be pretty inactive and some species are shy and difficult to see. They can be super useful in your aquarium though because they are happy to feed on food that has sunk to the bottom of the tank.

Each species does have its own preferred diet of course, and it’s important that you make sure that they are well fed (more on this later).

The Benefits Of Bottom Feeders

Bottom-feeder species are great for adding activity and life to the bottom of your aquarium. This can make your tank a much more lively environment that is even more fascinating to observe!

Apart from their interesting looks and behaviors, bottom-feeder fish have a bunch of benefits in the tank. Some species like the Otocinclus catfish are master tank cleaners because they feed on the algae that grow on the walls of fish tanks and the ornaments inside them.

Other bottom feeders like Cory Catfish feed by searching the substrate and any tight spaces in the aquarium for uneaten food which helps to keep your tank clean.

The Nine Best to Choose From

There are so many great bottom feeders out there, but these are definitely the favorites that I can recommend to any fishkeeper. Remember to take note of their needs to make sure they will work out in your tank! I’ve also included a few common bottom feeders that you should avoid.

Check out our video below from our YouTube channel. If you like this content, subscribe to our channel for additional videos. We are releasing videos every week. We go into more detail in the blog post below.

1. Corydoras Catfish

• Scientific Name: Corydoras spp.
• Adult Size: 1-3 Inches
• Care Level: Easy
• Temperament: Peaceful
• Minimum Tank Size: 10 + gallons for dwarf species, 20+ gallons for others
• Diet: Omnivorous, feed live and frozen foods, Sinking pellets and wafers
• Origin: South America
• Temperature: 72 – 82°F
• Swimming Level: Bottom

Cory Catfish or Corydoras are great little schooling catfish for the community tank. These bottom feeders for freshwater aquariums are a favorite in the aquarium hobby and there are many different species to choose from.

Some species like the Dwarf Cory Catfish and the Pygmy Cory Catfish can be kept in nano aquariums as small as a 10 gallon fish tank. Most Corydoras catfish species will prefer a 20 gallon tank or larger though. They are social fish so be sure to keep at least 6 together in the same aquarium.

Cory cats are great fun to watch as they cruise around the tank together, feeding on food lying on and in the substrate. A common mistake that fishkeepers make is to think that you don’t need to feed these fish. In fact, Cory catfish do best on a balanced diet of dried and live/frozen foods.

2. Otocinclus Catfish

• Scientific Name: Otocinclus spp.
• Adult Size: 2 inches
• Care Level: Moderate
• Temperament: Peaceful
• Minimum Tank Size: 10+ gallons
• Diet: Algae
• Origin: South America, Venezuela, Argentina
• Temperature: 70-74°F
• Swimming Level: Bottom, midwater, Top

Otos are very peaceful fish for the community tank. These little catfish are algae eaters, which means they are great for keeping your glass and ornaments clean. These nano fish are very popular in the aquarium trade and will do very well as long as you are able to maintain good water quality.

Mature aquariums with a healthy amount of algae provide the best aquatic environment for this fish species. You can also supplement their diet with algae wafers and slices of vegetables like zucchini.

3. Dojo Loach

• Scientific Name: Misgurnus anguillicaudatus
• Adult Size: 10 inches
• Care Level: Easy
• Temperament: Peaceful
• Minimum Tank Size: 55+ gallons
• Diet: Omnivorous, feed live and frozen foods, Sinking pellets and wafers
• Origin: Asia, China, Japan, Korea, Russia
• Temperature: 59-77°F
• Swimming Level: Bottom

Dojo Loaches are great fish for larger aquariums. These fish have the interesting habit of increasing their activity levels when the weather is changing, kind of like your own little weather forecaster! This has earned them the name of weather loach as well.

Apart from just the regular Dojo Loach, there is also a golden variety available in the hobby. These fish are active bottom feeders that love to search the substrate for uneaten food at the bottom of the tank.

4. Bristlenose Pleco

• Scientific Name: Ancistrus cirrhosus
• Adult Size: 5 inches
• Care Level: Easy
• Temperament: Semi-agressive
• Minimum Tank Size: 20 + gallons
• Diet: Vegetarian, Algae
• Origin: South America
• Temperature: 73-81°F
• Swimming Level: Bottom

Bristlenose Pleco fish are super interesting-looking catfish that fit in perfectly with most community tanks. They are peaceful bottom-dwelling fish, although they do tend to be aggressive towards other members of the same species.

For this reason, it’s better not to keep more than one adult in the same tank. These amazing bottom dwellers do a great job of keeping the tank clean by searching the substrate for algae and food leftovers.

5. Clown Pleco

• Scientific Name: Panaqolus maccus
• Adult Size: 3.5 inches
• Care Level: Moderate
• Temperament: Peaceful
• Minimum Tank Size: 20+ gallons
• Diet: Vegetarian, feed vegetables and algae wafers
• Origin: South America, Venezuela
• Temperature: 73-82°F
• Swimming Level: Bottom

These beautiful bottom-feeder fish (video source) need plenty of driftwood in their tank to feed on. They love slices of vegetables like zucchini and cucumbers and also enjoy frozen foods.

These fish are very peaceful and do great in community tanks. They do produce quite a lot of waste though so the tank does need to have decent filtration.

6. Freshwater Shrimp

• Scientific Name: Caridina & Neocaridina spp.
• Adult Size: 1.5-2 inches
• Care Level: Easy-Moderate
• Temperament: Peaceful
• Minimum Tank Size: 5+ gallons (20+ gallons recommended)
• Diet: Omnivorous, Algae, Sinking flakes & Pellets
• Origin: Asia, North America
• Temperature: 70-74°F
• Swimming Level: Bottom

The freshwater shrimp is an amazing aquatic animal that has become incredibly popular in the modern fish-keeping hobby. There are loads of different species available, and some eat algae while others will prefer pellet foods.

Shrimp will only get along with a few types of fish like Otocinclus catfish. Most carnivorous and omnivorous fish will see your shrimp as a food source, so many hobbyists prefer to keep shrimp-only tanks to be on the safe side.

7. Kuhli Loach

• Scientific Name: Pangio Kuhlii
• Adult Size: 4 inches
• Care Level: Moderate
• Temperament: Peaceful
• Minimum Tank Size: 20+ gallons
• Diet: Omnivorous, Feed sinking pellets, wafers, and frozen foods
• Origin: Southeast Asia
• Temperature: 73-86°F
• Swimming Level: Bottom

Kuhli Loaches are great-looking little bottom feeders. This fish species has some really silly antics and is great fun to watch when not hiding. They are nocturnal fish and tend to hide out during the day so you won’t see them every time you take a look at your tank.

Kuhli loaches are one of the best bottom-feeder fish in the hobby. They use their whiskers to locate food on the bottom of the tank and do a great job of picking up scraps of uneaten fish food. These fish will do best in a group of at least five. They should be kept on a sand or fine gravel substrate and love plenty of hiding spaces in the tank.

8. Panda Garra

• Scientific Name: Garra flavatra
• Adult Size: 3 inches
• Care Level: Moderate
• Temperament: Peaceful
• Minimum Tank Size: 20+ gallons
• Diet: Omnivorous, feed wafers, and frozen foods
• Origin: Southeast Asia
• Temperature: 70-74°F
• Swimming Level: Bottom

Panda Garras are very peaceful fish that prefer high flow tank conditions (video source). They are pretty new to the fish-keeping hobby but already very popular. They are actually Cyprinids from the carp species family.

Panda Garras get their name from their bold, panda-like stripes. These fish feed on biofilm and algae that grow on rocks at the bottom of the tank, but you should supplement their diet with some frozen foods and wafers for a balanced diet.

9. Clown Loach

• Scientific Name: Botia macracantha
• Adult Size: 12 inches
• Care Level: Moderate
• Temperament: Peaceful
• Minimum Tank Size: 100 gallons
• Diet: Carnivorous
• Origin: Southeast Asia, Indonesia, Borneo, Malaysia, Sumatra
• Temperature: 70-74°F
• Swimming Level: Bottom

Clown Loaches are a really cute bottom-feeder fish species for large aquariums. They are active but very peaceful fish that are great in community tanks. These fish like to school, so make sure you have at least 4 of them in the same aquarium. They are also great snail eating fish.

Other Great Types To Consider

Below is a list of honorable mentions. They are as popular or provide as much utility as the ones above, but are worth mentioning. Check them out below:

• Synodontis catfish- This is a great bottom feeder for African cichlid tanks in particular.
• Siamese Algae Eater– These active algae-eaters are great bottom feeders for community tanks. Keep these fish in groups of 5 or more in a 40-gallon tank or larger.
• Twig Catfish- These are some of the most interesting looking bottom-feeding fish in the hobby. They grow to 6 inches in length but are safe to keep with small, peaceful community fish.
• Pictus Catfish– These interesting little South American catfish are peaceful but very shy fish. They have pretty big mouths and will eat any small fish in your tank, so make sure they are the smallest fish in the aquarium.
• Yoyo Loach-These fish have markings on their sides that look just like the word yoyo. They are mostly peaceful but will love snacking on shrimp and snails in the tank.
• Zebra Loach– These are great little freshwater bottom-feeders for the community tank. The zebra loach is a peaceful fish that grows to just 4 inches or so.

Bottom Feeders To Avoid

Not all bottom feeder fish are suitable for your standard home aquarium. The following few species are not great choices for most fishkeepers:

Common Pleco – Hypostomus plecostomus

The Common Pleco is one of those fish that are probably more popular than they should be. These bottom-feeding fish can grow to sizes of over 20 inches in length which comes as a surprise to many fish keepers.

This is an easy mistake to make because they usually measure just a few inches in length when you see them at your local fish store. Unfortunately, these fish are often released into local ponds and rivers when they get too big, and they have become quite a nuisance in the wild¹.

They are great fish, but only for keepers with very large tanks who can take care of them properly.

Chinese Algae Eater – Gyrinocheilus aymonieri

The Chinese Algae Eater grows to about 10 inches or a little more in length. These fish grow fast and catch a lot of fishkeepers off guard when they get too big for their tank.

They are good algae eaters but have a tendency to get pretty aggressive towards other fish in the tank. In fact, Chinese algae eaters will even attack other fish to eat the slime coating off of their skin and scales.

These aren’t very good-looking fish either and you’re much better off choosing another fish from our list!

Tiger Shovelnose Catfish – Pseudoplatystoma fasciatum

The Tiger Shovelnose Catfish is a really cool-looking fish that many people have made the mistake of buying. It’s hard to imagine that the 4-inch long little cutie you just brought home can grow to over 3 feet in length!

These catfish are carnivorous and have big mouths. This means the rest of your fish are going to be eaten as soon as the Tiger Shovelnose is big enough to swallow them.

Avoid this species unless you have a very large aquarium (200 gallons), and are prepared to care for a very large carnivorous catfish!

How To Set Up Your Tank

Before buying any bottom-feeding fish, it’s really important to read up on its needs. Here is some basic information on setting up for bottom-feeding fish:

Filtration

Running a good quality filter in your aquarium is absolutely essential. Some fishkeepers make the mistake of thinking their bottom feeder fish will keep the tank clean so they don’t need a filter. Big mistake!

But which kind of filter should you choose? There are many options available, but as a general rule, pick a model that can process all the water in your tank at least 4 times every hour.

Some bottom-feeder fish like the Panda Garra like a stronger current in the tank, and for them, you can bump up the flow rate to as much as 10 times your tank volume per hour.

Water Quality

Good water quality is what keeps fish happy and healthy in your aquarium. Remember, your pets rely on you to provide them with a great environment to live in.

Once you’ve set up your tank and got your filter running, you’re going to want to start the process of fishless cycling. Once your tank is cycled and you have stocked it with some great fish, you’re going to want to get into the routine of performing a regular partial water change.

This means taking out a percentage of the water in your tank every week or two and replacing it with new water that you have treated with a conditioner. The amount of water you need to replace is going to depend on a couple of things like:

• The size of your aquarium
• How heavily stocked you are
• The bioload of your fish
• Whether you have live plants in the tank
• How powerful your filtration is

Testing Your Water

In order to know how stable your water quality is in the aquarium, and whether you’ve successfully cycled the tank, you’re going to need to test for a few parameters on a regular basis.

This is easy to do using a liquid test kit. Test the water before you do your regular water changes to know whether you’re performing regular and large enough water changes.

Substrates

Your choice of substrate can be pretty important for the health of your fish. This is especially true when it comes to bottom dwellers because they spend most of their time down on the bottom of the tank.

Sure, bottom-feeder fish can be kept in open bottom tanks, but this prevents them from acting out a lot of their natural behaviors and will probably leave them feeling seriously exposed.

Instead, choose a fine substrate like sand that allows these fish to dig through and forage in safely. Avoid using sharp substrates that can injure your fish.

Many bottom-feeder fish like loaches and cory catfish have fine whiskers known as barbels. Sharp gravel can damage these ultra-sensitive structures that are used to feel the substrate to find food.

Some bottom-feeder fish like the Kuhli Loach do not have scales and can get their skin scratched up on sharp substrates while digging through it. This can cause infections.

Hiding Places and Decorations

Bottom-feeder fish are often shy creatures that love having caves and other hiding places to hang out in. You can build your own caves out of rocks if you like, just make sure that your structure is safe and stable.

Driftwood that has holes in it, clay flowerpots, and purpose-built aquarium cave ornaments are other great ways to provide hiding places for your fish. Some bottom-dwellers, like Kuhli Loaches, will even dig themselves into the substrate to hide away and find shelter.

The Planted Aquarium

Growing live plants is a great way to make a really natural and healthy environment for your freshwater bottom-feeders and other fish. Keeping a planted tank can be really easy if you grow plants like Anubias and Java Ferns that don’t need any special equipment. Plants also create great places for your bottom-feeder fish to hide and look for food.

What To Feed

Bottom-feeder fish need to be fed a high-quality, balanced diet. Of course, different types of fish have different diets, but here are a few of the best food options available for your fish:

Frozen foods

Frozen foods are great for omnivorous and carnivorous bottom-feeder fish. Brine shrimp, bloodworm, and daphnia are all good examples of this food type. Frozen foods should not be the primary food source for your bottom-feeder fish but can be a great supplement.

Live foods

Live foods like brine shrimp, daphnia, micro worms, and mosquito larvae are great food sources for carnivorous and omnivorous fish. Fish love live food so much that it usually doesn’t get to the bottom of the tank before your other fish eat it all!

Live Algae

Algae eaters like Otocinclus Catfish, Siamese Algae Eaters, and Plecos have a natural diet of algae. This is great because they are able to get a healthy meal and keep your aquarium clean at the same time! Algae grow in all mature fish tanks, especially tanks with bright light and a lot of nutrients in the water.

Algae Wafers

Algae wafers can be a great supplementary food source for omnivorous and algae-eating fish like Clown Plecos, Otos, and Siamese Algae Eaters. Look for brands like Hikari when search for a wafer.

Shrimp Food

Most shrimp are omnivorous creatures and there are plenty of excellent products available that are designed specifically for their needs. Shrimp food is available in gel, pellet, wafer, and stick form.

Pellets

These sinking pellets provide balanced nutrition for all sorts of omnivorous aquarium fish. There are plenty of good quality products available on the market, just make sure you choose something that is the right size for your fish.

Vegetables

Herbivorous fish like Otos and Bristlenose Plecos love vegetables. Sliced cucumbers and zucchinis are great options, but you can also use blanched peas, broccoli, and cabbage for variety.

Where To Buy

Most fish stores have a good variety of bottom-feeding fish for freshwater aquariums. These days, many fishkeepers prefer the convenience of buying online.

My favorite online retailer is Flipaquatics because they offer a great range of fish at great prices. They also fully quarantine their livestock. They really care for their stock and their 100% live arrival guarantee takes so much of the stress out of buying and transporting new pets. For larger fish, check out the link above for other fish retailers.

FAQS

Final Thoughts

Bottom feeder fish have a place in pretty much any home aquarium. These fish are fun to watch, look great, and work hard to keep your tank clean. If you don’t already have a few bottom feeders in your fish tank, why not pick some from our list and add them to your tank today?

I hope you’ve enjoyed the article and please comment below if you have any questions!

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📘 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.

Table of Contents

• What Most Care Guides Get Wrong About Ember Tetra The Perfect Nano Fish for Planted Tanks
• The Reality of Keeping Ember Tetra
• Species Overview
• Classification
• Origins and Habitat
• What Does they Look Like?
• How Big are They?
• How Long Do They Live?
• Ember Tetra Care Guide
• What Do They Eat?
• Setting Up Your Tank
• Water Quality
• Breeding
• Health and Disease
• Where to Buy
• Frequently Asked Questions
• Is the Ember Tetra The Perfect Nano Fish for Planted Tanks Right for You?
• What It Is Actually Like Living With Ember Tetra
• How the Ember Tetra The Perfect Nano Fish for Planted Tanks Compares to Similar Species
• Closing Thoughts
• Recommended Video

The ember tetra is the definitive nano tank fish. In the right setup with dark substrate, tannins, and proper lighting, they glow like embers in a fire. In a bare, bright tank with hard water, they look like nothing. Setup is everything with this species.

Ember tetras in the wrong tank are invisible. In the right tank, they are on fire.

What Most Care Guides Get Wrong About Ember Tetra The Perfect Nano Fish for Planted Tanks

The most common mistake I see with ember tetra the perfect nano fish for planted tankss is keeping too few. Guides will say “minimum 6” and leave it at that. In reality, these fish behave completely differently in a proper group of 8 to 10 or more. Keeping just 3 or 4 often leads to stress, hiding, and fin nipping that wouldn’t happen in a larger school. Another thing most guides miss is how much lighting and decor affect this species. Ember Tetra The Perfect Nano Fish for Planted Tankss look washed out under bright white LEDs on a light substrate. Dim the lights, add some tannins, use a dark background, and you’ll see colors you didn’t know they had. I’ve also noticed that many care sheets recommend overly broad water parameters. Yes, ember tetra the perfect nano fish for planted tankss are adaptable.

The Reality of Keeping Ember Tetra

They look terrible at the fish store. Ember tetras in a bare store tank under bright lights look pale and washed out. This is the number one reason people walk past them. In a planted tank with dark substrate and moderate lighting, they develop an intense orange-red glow that transforms the entire tank. Do not judge this fish by its store appearance.

Group size matters more than tank size. You can keep embers in a 10-gallon, but the real key is school size. Six is the minimum, but 10 to 15 is where the magic happens. In large groups they school tightly, display brighter color, and exhibit natural foraging behavior that makes them genuinely engaging to watch.

They are not as fragile as they look. Their tiny size makes people assume they are delicate. They are not. Ember tetras tolerate a reasonable range of water parameters and are hardier than most fish their size. The main thing that kills them is poor acclimation and ammonia spikes in uncycled tanks.

Biggest Mistake New Owners Make

Buying 4 or 5 and sticking them in an uncycled tank. They need a mature tank and a proper school. Anything less and you get pale, stressed fish that hide constantly.

Expert Take

After 25+ years in this hobby, the ember tetra is still my top recommendation for anyone setting up a planted nano tank. No other fish at this size delivers this combination of color, behavior, and ease of care.

Species Overview

Scientific Name	Hyphessobrycon Amandae
Common Names	Fire Tetra, Amanda’s, Dwarf Reds, Reds
Family	Characidae
Origin	Brazil
Diet	Omnivore
Care Level	Easy
Activity	Very Active
Lifespan	2 – 4 Years
Temperament	Peaceful
Tank Level	Midwater
Minimum Tank Size	10 gallons
Temperature Range	72 ° to 80 °F
Water Hardness	4 to 8 dkH
pH Range	6.5 to 7.5
Filtration/Water Flow	Low
Water Type	Freshwater
Breeding	Egg layer
Difficulty to Breed	Easy
Compatibility	Community tanks
OK, for Planted Tanks?	Yes

Classification

Order	Characiformes
Family	Characidae
Genus	Hyphessobrycon
Species	H. Amandae (Gery & Uj, 1987)

Origins and Habitat

The Ember Tetra was discovered fairly recently in 1987. It was named after Heiko Bleher’s mother, Amanda Bleher¹.

But don’t be fooled.  Heiko Bleher didn’t actually stumble upon this species himself.  Instead, he is known for his work with other South American fish. 

Now back to the Ember Tetra.  These fish come from Brazil, where they mostly reside in the Araguaia River basin.  Its slow-moving waters contain plant materials that decompose, creating an acidic environment. 

These stained waters are called ‘blackwater.’ This dark color makes it easier for Ember Tetras to hide.  

As shoaling fish, Ember Tetras live in groups.  However, they are not to be confused with schooling fish.  

Unlike schooling fish, a group of Ember Tetras doesn’t swim in the same direction.  They just stay close together.    

Ember Tetras are peaceful and can coexist with many other types of wild fish.  Some of those fish include:

• Other Tetras
• Pygmy Rasbora
• Pleco Catfish  

By the early 1900s, Ember Tetras had found their way into freshwater fish tanks.  Since then, they have become a top choice for aquarium enthusiasts.  

And that’s understandable when you consider the Ember Tetra’s beautiful appearance.  Plus, they are easy to care for.         

What Does they Look Like?

Most Ember Tetras are orange, but some have a reddish-orange glow.  In either case, the Ember Tetra’s iridescent scales make this fish shimmer and stand out in an aquarium.     

Usually, their fins are a bit darker than the rest of their body.  Their bodies are thicker in the front and thin out towards the back.   

How Long Do They Live?

With proper care, aquarium Ember Tetras live about 2-4 years. Although some fishkeepers have claimed this species can live for 10 years, that claim has not been proven and is likely inaccurate.   

Their short life span is one disadvantage of keeping this otherwise fantastic fish.  But you helps your Ember Tetras live as long as possible by giving them:

• The ideal tank environment
• A high-quality diet
• Interactions with other fish

Later in this article, we will talk more about those important aspects of Ember Tetra care.  

Ember Tetra Care Guide

Ember Tetra are peaceful fish, making them a great addition to community tanks.  You can also keep them in a species-specific tank.

Whether you choose the former or the latter option, Ember Tetras need to live in a group.  The size of the group depends on how big your tank is, but aim for a minimum of 10-15 fish.

Because they are so easygoing, the males are unlikely to show aggression towards each other.  That makes it easy to put together a group of Ember Tetras.  

Although they don’t cause trouble, Ember Tetras are active little fish.  They are always swimming around and aren’t afraid to explore their surroundings.  

While swimming about, they will likely stick to the middle of the tank.  When they want a break, they will seek refuge in the tank’s plants.  That’s why you need to add some to your aquarium.  More on that later.  

And those plants aren’t just a resting spot.  Ember Tetras also have a great time racing through them as they swim after each other.  You will definitely be entertained by these fish!       

What Are Good Tank Mates for Them?

Although Ember Tetras are fine in a species-specific tank, their bright colors and gentle disposition make them an excellent choice for a community tank.  

You just have to choose the right tank mates.  When selecting those tank mates, keep the following pointers in mind:

• Avoid aggressive fish.  Instead, choose fish that have a friendly nature.  

• Big fish might eat your tiny Ember Tetras.  That’s why you need to avoid any species that are larger than Ember Tetras.   

• Ember Tetras are middle-dwellers, so it’s a good idea to select bottom and/or top dwellers for their tank mates.  

Best Tank Mates

Now that we’ve given you some general guidelines, here are some specific ideas for tank mates:

• Pencil Fish
• Cory Catfish 
• Rasboras
• Neon Tetras
• Pygmy Catfishes
• Guppies
• Mollies
• Hatchetfish
• Rosy Tetras
• Bleeding Hearts
• Black Neons
• Flames
• Bettas

And if you are looking for some non-fish mates, nerite snails and other small snails are great options.  Many nano fish are compatible with these fish.

Least Compatible Fish

Here are a few examples of fish you definitely want to keep out of an Ember Tetra tank:

• Goldfish
• Koi
• Cichlids
• Jack Dempseys
• Oscars
• Angelfish
• Tiger Barb
• Clown Loaches
• Any type of carnivorous fish

What Do They Eat?

It’s not hard to find foods that Ember Tetras will gobble up.  The hardest part of feeding this fish is making sure the food is small enough for these tiny creatures to consume.

With that in mind, you need to break up the food into small pieces.  This will help your Ember Tetras eat the food more easily, which prevents other fish from stealing it.  

Some options include: 

• Micropellets
• Crushed up flakes
• Frozen foods    

And don’t get upset if you catch your fish nibbling on a tank plant.  They are just enjoying a little snack and won’t consume enough of the plant to harm it.  A good staple food to consider is Xtreme Aquatic Foods Nano. It’s specially designed for small freshwater fish.

Give Them Live Foods

Wild Ember Tetras live on a diet of plants and very small prey, such as worms, invertebrates, and zooplankton.  

Keeping this natural diet in mind, it would be great if you could incorporate some live foods into your Ember Tetras’ meals.  

Those foods will add some variety to their diet, which ensures all of their nutritional needs are met.      

Furthermore, they will also help prevent digestive issues that is caused by consuming too much processed food.   

Here are some live foods you can give your Ember Tetra:

• Daphnia
• Tubifex worms
• Baby brine shrimp
• Blood worms
• Insect larvae
• Grindal worms
• Microworms

You can also find these foods in frozen food form if you shop around locally.

How Much and How Often to Feed Them

You should feed your Ember Tetras about 2-4 times each day.  At every meal, carefully avoid overfeeding.

How can you tell if you are feeding the right foods in the right amounts?  It’s not hard to find out.  

All you have to do is observe your fish.  Are they brightly colored?  Are they active?  Do they do be at ease?

If you can answer yes to those questions, your Ember Tetras’ diet is meeting their needs.  But if their color begins to fade or they aren’t acting quite right, their diet should be tweaked.    

Setting Up Your Tank

When creating the ideal environment for your fish, you need to keep their natural habitat in mind.  Your goal is to get as close to this habitat as possible.  

But what exactly does that look like?  That’s what we are going to cover in this section.  Read on to learn more.  

Tank Size

Before we talk about the tank’s environment, we need to discuss the tank’s size.  It’s important to choose the right size because Ember Tetras require space for swimming around.  

The right size depends on how big the group is.  If you have 5-8 fish, the tank should be at least 10 gallons.    

For every fish beyond the number 8, increase the tank size by one gallon.  Once you hit the 20-25 fish range, you will need a 20-25 gallon tank.  

Here’s a quick tip.  Maximize swimming space by getting a long tank, rather than a tall one.

Tank Setup

After you choose the right size you need to set up the tank.  The tank should include plants, substrate, and decor.  Read on to learn more.  

Plants

Ember Tetras need plants.  The total amount depends on how large the tank is and how many fish you have.  

You certainly don’t want to crowd your fish.  Instead, give them just enough plants to help them feel secure.  

This will prevent stress.  And when your fish are stress-free, they will stay healthy and beautiful.

Furthermore, when the tank has the right amount of plants, your Ember Tetra will have a blast swimming through them.  Your fish can also use them as resting spots.      

As an added bonus, the plants also house bacteria that your little fish can eat, adding extra nutrition to their diet.  

Some great plants to use are:

• Java Moss
• Hornwort
• Anacharis
• Crypts
• Bladderworts
• Najas Grass
• Peacock moss
• Duckweed

Floating plants work really well with these fish too. They provide another place for them to hide.

Substrate

You can use enriched active soil or mud for substrate.  Whichever one you choose, it’s best to go with a dark color.  This dark tone will make your gorgeous Ember Tetras really stand out!  

Decor

The tank’s finishing touches should include rocks and wood.  Ember tetras are great fish to use in planted aquascapes like Iwagumi and Dutch aquascapes. If you have serious interest in those styles of planted tanks, check out the links.

Water Quality

Okay, now you know what to put in the tank.  Great!  Next, you need to learn how to maintain ideal water conditions.  

Let’s get started. 

Filtration

Wild Ember Tetras live in slow-moving waters, so it’s necessary to replicate this in your aquarium.  

That is done by installing a sponge filter.  The filter will keep the water clean while also generating the appropriate water flow.    If you need better filtration because you are using a lot of plants, you can consider putting a sponge on the intake and lowering the flow.

Water Parameters

These tiny little freshwater fish can’t handle change very well.  That’s why consistency is key when caring for Ember Tetras.  Avoid large fluctuations by keeping a close eye on the tank’s water temperature and pH.  

Here are the water parameters to aim for:

• Water Temperature: 72-80 degrees Fahrenheit  
• pH:  5.5 – 6.7 
• KH: 4 – 8

As you can see, Ember Tetras prefer acidic water.  You reduces pH by adding driftwood or Indian almond leaves to the tank.     

Aquarium Maintenance

Although Ember Tetras are very easy to care for, they are sensitive and require regular tank maintenance.  If you fall behind, they might end up with health problems.        

Test Tank Conditions

It’s a good idea to get a test kit and test the water about 1-2 times per week.  Taking this step will help you maintain ideal water conditions, allowing your Ember Tetras to thrive.       

Breeding

Breeding Ember Tetras is fairly easy.  In fact, some of your fish might breed on their own, without any work on your part.  

However, the parents and other fish are likely to eat the fry.  That’s why it’s best to work through a process that involves your oversight.  Let’s talk about that right now.  If you prefer a video, you can check out the one below by MaFishGuy Aquarium Information.

Sexing

First, you will need to select a male and female to place in a separate breeding tank.  Although sexing Ember Tetras is a bit challenging for newbies, don’t let that intimidate you.  

Just look at the shape and color of the fish.  Females are rounder and males are brighter.   

Getting Your Fish Ready to Breed

Ember Tetras are ready to breed when they are about 4-6 months old.  After you’ve picked out a male and female, place them in a separate breeding tank, away from the other fish.  

The breeding tank’s water conditions should be pretty close to the regular tank’s conditions, with the temperature and pH being on the higher end of the optimal range.

Get your fish in tip-top shape for breeding by feeding larval brine shrimp every day for two weeks.        

The Breeding Process

When the fish are ready to breed, the male will start chasing and nipping the female.  Once the female is carrying eggs, her abdomen will grow larger.  

This species doesn’t lay its eggs in any particular location.  That means your Ember Tetra’s eggs will sink to the bottom of the tank.  

If you put mesh fabric or an egg crate in the tank, these barriers will keep the parents from getting to the eggs.  

Caring for Fry

After the eggs have been laid, the parents might try to eat them.  Prevent this by removing them from the tank immediately after the female lays the eggs.  

The eggs will hatch in approximately 2-3 days, giving you about 100 fry. 

After they hatch, start feeding infusoria.  When they are a week old, give them baby brine shrimp and small worms.  Eventually, you can start feeding crushed fish flakes.   

Health and Disease

Thankfully, Ember Tetras don’t typically have a lot of health problems.  While hardy, that doesn’t mean these fish are invincible.  

If you want to keep them healthy they need high-quality food, the right water conditions, and social interactions with other tetras.

Evaluating Your Ember Tetras’ Health

How can you tell if your Ember Tetras are healthy?  Just take a look at their appearance.  If your fish are brightly colored, they are in great shape!

On the other hand, a pale fish that acts abnormally isn’t doing too well.  This sick fish is quite vulnerable to attacks and should be removed from the tank.  

Common Their Health Issues

Here are the health issues and fish diseases that Ember Tetras are most likely to have:

• White Spot Disease – This appears as white spots and is caused by stress or poor care.  Prevent this disease by maintaining ideal water conditions.  If the disease occurs, there are products to treat it.    

• Fungal and Bacterial Infections – These infections is fatal.  Be sure to address the issue immediately!  Signs include rotting fins and cloudy masses.   

• Impaction – Too much dry food can block the digestive system.  Prevent impaction by including wet food in the diet or soaking dry foods before feeding.      

Where to Buy

Many fish stores sell Ember Tetras, making them easy to find.  You will pay about $2 per fish.  Some online fish stores will also sell them. It may make sense to purchase them online if you cannot find a quality local fish store in your area.

Frequently Asked Questions

Is the Ember Tetra The Perfect Nano Fish for Planted Tanks Right for You?

Before you add a ember tetra the perfect nano fish for planted tanks to your tank, it’s worth asking whether this species actually fits your setup and your goals. Here’s a quick breakdown to help you decide.

This species is a good fit if:

• You have a large enough tank to manage territories. Cramped conditions amplify aggression.
• You’re comfortable managing aggression through stocking ratios, line of sight breaks, and tank layout.
• You can commit to regular water changes. These fish produce more waste than many smaller species.
• You’re not planning a peaceful community tank. Ember Tetra The Perfect Nano Fish for Planted Tankss need tank mates that can hold their own.
• You enjoy watching active, interactive fish. Cichlids have personality that smaller species simply don’t match.
• You have backup plans. Sometimes a particular fish just doesn’t work out, and you need a way to rehome it.
• You’re feeding a varied, high-quality diet. Color and health depend on nutrition.

If most of those points line up with your setup, the ember tetra the perfect nano fish for planted tanks is worth serious consideration. If several don’t, it’s better to choose a species that matches your tank now rather than trying to make it work.

What It Is Actually Like Living With Ember Tetra

A school of 10+ ember tetras in a densely planted tank creates one of the most visually satisfying displays in the hobby. They move through plant stems like little orange sparks drifting through a forest.

They occupy the middle water column and rarely venture to the surface or bottom. This makes them perfect tank mates for surface dwellers and bottom feeders.

Their color changes throughout the day. First thing in the morning they are pale, and by afternoon under full lighting they glow their brightest orange-red.

They are peaceful to the point of being easy targets. Fast or aggressive tank mates will stress them out and fade their color. Keep the tank calm.

How the Ember Tetra The Perfect Nano Fish for Planted Tanks Compares to Similar Species

Choosing between similar species is tricky. Here’s how the ember tetra the perfect nano fish for planted tanks stacks up against some common alternatives.

Ember Tetra The Perfect Nano Fish for Planted Tanks vs. Glowlight Tetra: Both are warm-toned community tetras, but they fill slightly different roles. The ember tetra the perfect nano fish for planted tanks is smaller and can work in nano tanks as small as 10 gallons, while the glowlight tetra is a bit larger and does best in 15+ gallon setups. Color-wise, they complement each other well and is kept together in a mid-sized planted tank. Check out our Glowlight Tetra care guide for a detailed breakdown.

Ember Tetra The Perfect Nano Fish for Planted Tanks vs. Flame Tetra: Both species occupy a similar niche in community tanks, but they differ in temperament, coloration, and ideal water conditions. The ember tetra the perfect nano fish for planted tanks is a solid choice for hobbyists who want reliable schooling behavior and easy care, while the flame tetra brings a slightly different look and energy to the tank. In my experience, the deciding factor usually comes down to which aesthetic you prefer and what other species are already in the tank. Check out our Flame Tetra care guide for a detailed breakdown.

Closing Thoughts

To sum it all up, Ember Tetras are great fish to keep.  They are easy to care for and get along well with many different types of fish.  Plus, their stunning colors will make your aquarium look amazing!

As long as you continue providing great care, your Ember Tetras will light up the tank.  And that’s why so many aquarium hobbyists love this species.  

Recommended Video

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

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

Nano fish are one of my favorite topics to talk about, and I say that after 25+ years in this hobby. I’ve set up countless tanks. from sprawling 125-gallon reef systems down to tiny desktop tanks. and there’s something genuinely special about a well-executed nano aquarium. The challenge is picking the right fish. Small tanks are less forgiving on water quality, so you need species that stay small, tolerate stable-but-modest conditions, and actually thrive rather than just survive. In this guide I’m sharing 21 nano fish I’d personally recommend, along with the honest details on what makes each one work (or not) in a small tank.

Going Nano

The most obvious reason to get into nano aquariums is to save on space. Once the aquarium ‘bug’ bites, a lot of us want just one more tank. Aquariums are big, heavy, and can be expensive, but they don’t have to be. Welcome to the world of nano aquariums!

In the aquarium hobby, nano simply means small. There aren’t really any strict rules about what counts as nano and what doesn’t, but generally, a nano species is one that grows about 2 inches or less in length. Nano tanks would be about 20 gallons or less, but again, just think of the word nano as meaning small.

A common misconception about nano tanks, however, is that they are easier to maintain than larger aquariums. Actually, keeping small tanks with miniature fish can be a very interesting and hands-on hobby. This is because the smaller the aquarium the more sensitive the system will be to changes in water quality.

21 Best Nano Fish For Your Freshwater Tank

Of course, not all fish that are 2 inches or less make great aquarium subjects, so I’ve put together a list of 21 awesome nano fish to get you started. All these fish do really well in nano tanks and are pretty easy to find. For each species, I’ll provide a basic description and some important information like:

• Scientific Name
• Adult Size
• Care Level
• Temperament
• Minimum Tank Size
• Diet
• Origin
• Temperature
• Swimming Level

We have a video below from our YouTube channel. We go into greater detail in the blog post below. If you like our video content, please give us a like and subscribe. We post every week!

So let’s jump right in and get to know the stars of the nano world!

1. Neon Tetra

• Scientific Name: Paracheirodon innesi
• Adult Size: 1.5 inches
• Care Level: Easy
• Temperament: Peaceful
• Minimum Tank Size: 10 gallons
• Diet: Carnivorous, feed granules or flakes, live and frozen foods
• Origin: South America, Brazil, Peru, Colombia
• Temperature: 70-74°F
• Swimming Level: Midwater

You only have to take a look at the stunning Neon Tetra to understand why they are one of the most popular freshwater fish for nano tanks. These stunning South American fish are easy to feed and care for, even if you are a beginner.

Neon Tetras are peaceful fish that work great in community tanks with aquatic plants. Neons are social little fish, so be sure to keep a group of at least 5 or 6 to keep them happy and confident.

2. Ember Tetra

• Scientific Name: Hyphessobrycon amandae
• Adult Size: 0.8 inches
• Care Level: Easy
• Temperament: Peaceful
• Minimum Tank Size: 10 gallons
• Diet: Carnivorous, feed granules or flakes, live and frozen foods
• Origin: South America, Brazil
• Temperature: 70-74°F
• Swimming Level: Midwater

Ember Tetras are active and colorful little shoaling fish that look especially good in planted aquariums. They are great fun to watch as they swim around actively in the nano aquarium. These beginner fish are very peaceful, making them a perfect addition to community tanks.

3. Harlequin Rasbora

• Scientific Name: Rasbora heteromorpha
• Adult Size: 1.75 inches
• Care Level: Easy
• Temperament: Peaceful
• Minimum Tank Size: 10 gallons
• Diet: Omnivorous, feed granules or flakes, live and frozen food
• Origin: Asia, Thailand, Singapore, Malaysia
• Temperature: 70-74°F
• Swimming Level: Midwater, Top

Harlequin Rasboras are neat little shoaling fish for nano tanks. The bold black triangular marking and golden orange colors of these fish look amazing as they move around together. The Harlequin Rasbora is a schooling fish that prefer to be in groups, so keep ten or more if possible.

4. Cardinal Tetra

• Scientific Name: Paracheirodon axelrodi
• Adult Size: 1.5 inches
• Care Level: Easy
• Temperament: Peaceful
• Minimum Tank Size: 15+ gallons
• Diet: Carnivorous, feed granules or flakes, live and frozen food
• Origin: South America, Brazil
• Temperature: 74-78°F
• Swimming Level: Midwater, Top

The Cardinal Tetra is another great tiny fish for nano tanks. They are often confused with their smaller neon cousins, although cardinals have a lot more red coloration on their sides. A beautiful crimson shade extends from their tails all the way to their gills.

Cardinal Tetras contrast incredibly in heavily planted natural aquariums and get along perfectly with other small and peaceful tankmates in nano aquariums.

5. Pygmy Corydoras

• Scientific Name: Corydoras pygmaeus
• Adult Size: 1 inch
• Care Level: Easy
• Temperament: Peaceful
• Minimum Tank Size: 10+ gallons
• Diet: Omnivorous, feed pellets, wafers, frozen and live foods.
• Origin: South America, Brazil
• Temperature: 70-74°F
• Swimming Level: Bottom

Pygmy Corydoras are great little nano catfish. Like other schooling fish, they should be kept in groups of 6 individuals or more so that they can display all of their natural social behaviors in the nano aquarium.

Although these little catfish spend most of their time at the bottom of the nano tank, they will also swim around in the midwater, even making occasional trips up to the surface of the water. Cory cats feed by sifting through the substrate, so use sand instead of any sharp gravel that might hurt them.

6. Longfin White Cloud Minnow

• Scientific Name: Tanichthys albonubes
• Adult Size: 1.5 inches
• Care Level: Easy
• Temperament: Peaceful
• Minimum Tank Size: 10 gallons
• Diet: Carnivorous, feed granules or flakes, live and frozen foods
• Origin: Asia, China, Vietnam
• Temperature: 70-74°F
• Swimming Level: Midwater

The Longfin White Cloud Minnow is an even more attractive version of a classic aquarium species. These colorful little fish come from an area known as the white cloud mountain and do best in cooler water than your typical tropical aquarium fish. These fish should be kept in groups of ten or more to really enjoy all they have to offer.

7. Cherry Barb

• Scientific Name: Puntius titteya
• Adult Size: 2 inches
• Care Level: Easy
• Temperament: Peaceful
• Minimum Tank Size: 20 gallons
• Diet: Omnivorous, feed, live, frozen, and dried foods
• Origin: Asia, Sri Lanka
• Temperature: 70-74°F
• Swimming Level: Midwater

Although Cherry Barbs are classified as a nano species, they do need a tank of about 20 gallons or more to be at their happiest. Both the males and females have beautiful orange colors, but the males are definitely the more colorful ones, especially when breeding. It is best to keep these barb fish in groups of 6 or more and in a ratio of one male to two females.

8. Spotted Rasbora

• Scientific Name: Boraras maculatus
• Adult Size: 1 inch
• Care Level: Moderate
• Temperament: Peaceful
• Minimum Tank Size: 10 gallons
• Diet: Carnivorous, feed live or frozen foods and granules
• Origin: Asia, Malaysia, Indonesia
• Temperature: 70-74°F
• Swimming Level: Midwater, Top

Spotted Rasboras are true nanos (video source). These slim little shoaling fish reach about an inch in length and are some of the smallest freshwater fish in the hobby. Although they are fairly easy to care for, they are shy by nature so keep them only with very calm and peaceful fish, or even better, in large groups with inverts.

9. Gold White Cloud Minnow

• Scientific Name: Tanichthys albonubes
• Adult Size: 1.5 inches
• Care Level: Easy
• Temperament: Peaceful
• Minimum Tank Size: 10 gallon
• Diet: Live, frozen, and dried foods
• Origin: Asia, China
• Temperature: 70-74°F
• Swimming Level: Midwater

Gold white clouds are a familiar favorite with even more color than the regular species (video source). These beginner fish get their name from the white cloud mountain region where they were first found in the wild.

They are shoaling fish that should be kept in cool water tanks, and often do best without heating. These peaceful fish prefer to live in groups of ten or more, although a group of six will also work in a smaller nano aquarium.

10. Bumblebee Platy

• Scientific Name: Xiphophorus maculatus
• Adult Size: 2-3 inches
• Care Level: Easy
• Temperament: Peaceful
• Minimum Tank Size: 15 gallons
• Diet: Frozen, live, or dried foods
• Origin: North and South America, Mexico, Nicaragua, Guatemala, and Belize
• Temperature: 72-80°F
• Swimming Level: Midwater

Bumblebee Platys get their name from their boldly contrasting black and yellow markings (video source). They are a great beginner community species for home aquariums.

Keeping more females than males is generally advised. This gives the females a break from the males’ attention. These fish are livebearers, so you can expect plenty of fry if your fish are happy and healthy.

11. Celestial Pearl Danio

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• Scientific Name: Celestichthys margaritatus
• Adult Size: 0.75 inches
• Care Level: Moderate
• Temperament: Peaceful
• Minimum Tank Size: 10 gallons
• Diet: Omnivorous, feed dried, frozen, and live foods
• Origin: Asia, Myanmar, Thailand
• Temperature: 70-74°F
• Swimming Level: Midwater

Celestial Pearl Danios are often known as CPDs or the Galaxy Rasbora. The popularity of Celestial Pearl Danios is no surprise because they are some of the most stunning nano fish available in the aquarium trade.

The male fish have bolder markings than the female, but both sexes are really pretty. Celestial Pearl Danios are the perfect species for heavily planted nano tanks.

12. Chili Rasbora

• Scientific Name: Boraras brigittae
• Adult Size: 0.8 inches
• Care Level: Easy
• Temperament: Peaceful
• Minimum Tank Size: 5+ gallons
• Diet: Carnivorous, feed live, frozen, and dried foods
• Origin: Asia, Borneo
• Temperature: 70-74°F
• Swimming Level: Midwater, Top

The Chili Rasbora, Boraras brigittae, is a colorful and active micro Rasbora species that grows to less than an inch in length. This makes them perfect for smaller tanks with shrimp (video source).

They should be kept in groups of at least 6, although a larger tank with an even larger school is a great option too. Chilli Rasboras will feel most at home and look their best in a soft water tank with plenty of aquatic plants.

13. Red Pencil Fish

• Scientific Name: Nannostomus beckfordi
• Adult Size: 1.4 inches
• Care Level: Moderate
• Temperament: Peaceful
• Minimum Tank Size: 10 gallons
• Diet: carnivorous, Feed live, frozen, and dried foods
• Origin: South America, Brazil, Venezuela, Guyana, Suriname, and French Guiana
• Temperature: 70-74°F
• Swimming Level: Midwater, top

Red Pencil Fish are peaceful community fish that look and feel their best in a nano tank with plenty of live plants and hardscapes like driftwood and rocks. This species of small freshwater fish do great in community aquariums, as long as its nano tank mates are also peaceful and not too big.

14. Black Neon Tetra

• Scientific Name: Hyphessobrycon herbertaxelrodi
• Adult Size: 1.5 inches
• Difficulty Level: Easy
• Temperament: Peaceful
• Minimum Tank Size: 20 gallons
• Diet: Omnivorous, feed, live, frozen, and dried foods
• Origin: South America, Brazil
• Temperature: 70-74°F
• Swimming Level: Midwater

Black Neon Tetras are hardy freshwater shoaling fish that are a great beginner species. If you’re looking for something a little different from the more popular neons and cardinals, this could be just the fish for you. They are a little larger than some other tetras though, so they should be kept in tank sizes of about 20 gallons or more. On average, Black Neons are hardier than Neons and Cardinal tetras.

15. Siamese Algae Eater

• Scientific Name: Crossocheilus oblongus
• Adult Size: 7 inches
• Difficulty Level: Easy
• Temperament: Peaceful
• Minimum Tank Size: 40 gallons
• Diet: Herbivorous, feed pellets and wafers
• Origin: Asia, Malaysia, Thailand
• Temperature: 61-75°F
• Swimming Level: Bottom

The Siamese Algae Eater (SAE) is a great little species that is very useful in the aquarium. They eat algae, which can really help to keep your aquarium looking great.

Of course, this doesn’t mean you don’t have to feed them regularly as well. SAEs grow to over 6 inches in length, so they do need at least a 40-gallon aquarium to thrive. Not exactly a nano fish, but they work really well in planted tanks.

16. Clown Killifish

• Scientific Name: Epiplatys annulatus
• Adult Size: 1.5 inches
• Difficulty Level: Moderate
• Temperament: Peaceful
• Minimum Tank Size: 5 gallons
• Diet: Carnivorous, feed live and frozen foods
• Origin: Africa, Sierra Leone, Guinea, Liberia
• Temperature: 68-79°F
• Swimming Level: Top

If you want a great-looking species of fish for the top water levels of your nano aquarium, the Clown Killifish is a great option (video source). These tiny fish are little predators that like to look for tiny insects on the surface of the water. Clown killifish prefer calm water conditions and should be fed small animal foods like baby brine shrimp.

17. Glolight Danio

• Scientific Name: Celestichthys choprae
• Adult Size: 1.5 inches
• Difficulty Level: Easy
• Temperament: Peaceful
• Minimum Tank Size: 15 gallons
• Diet: Carnivorous, feed live, frozen, and dried foods
• Origin: Asia, Myanmar
• Temperature: 72-80°F
• Swimming Level: Midwater

Glolight Danios are gorgeous little fish for nano tanks, with all-natural colors. This relative of the Celestial Pearl Danio is pretty new to the hobby but has really grown in popularity.

They are an active species that like to be kept in groups of at least 6. Keep these small danio fish in a tank with lots of plants and a dark substrate to really bring out their colors.

18. Panda Cory

• Scientific Name: Corydoras panda
• Adult Size: 2 inches
• Difficulty Level: Easy
• Temperament: Peaceful
• Minimum Tank Size: 15 gallons
• Diet: Omnivorous, feed live, frozen, and dried pellets/tablets
• Origin: South America, Peru
• Temperature: 70-74°F
• Swimming Level: Bottom

Panda Corys are very distinctive little catfish with their bold black and silvery markings. These active little bottom feeders should be kept in groups so that you can watch them explore the nano tank together with confidence. Panda Corys are very peaceful creatures that work well in community tanks.

19. Dwarf Honey Red Gourami

• Scientific Name: Trichogaster chuna/ Colisa chuna
• Adult Size: 2 inches
• Difficulty Level: Moderate
• Temperament: Semi-aggressive when breeding
• Minimum Tank Size: 15 gallons
• Diet: Carnivorous, feed frozen, live, or dried foods
• Origin: Asia, India, Bangladesh, Nepal
• Temperature: 72-80°F
• Swimming Level: Midwater

The Dwarf Honey Red Gourami is an excellent freshwater fish species with some really fascinating behaviors. These labyrinth fish breathe air from the water surface and they are foam nesters. Dwarf Honey Red Gouramis are great in community tanks if they are kept with other small, peaceful species.

20. Betta Fish

• Scientific Name: Betta splendens
• Adult Size: 2.5 inches
• Difficulty Level: Moderate
• Temperament: Aggressive
• Tank Size: 5+ gallons
• Diet: Carnivorous
• Origin: Asia, Thailand, Cambodia, Vietnam
• Temperature: 74-79°F
• Swimming Level: Midwater

It’s not difficult to see why Betta fish are some of the most popular aquarium fish of all time. These small freshwater fish look amazing and have heaps of personality, making them really great pets. Caring for Betta fish is not as easy as many people think, so be sure to do your homework before bringing one home. Male bettas also have special consideration for tank mates since they are territorial and will fight with other males.

21. Otocinclus Catfish

• Scientific Name: Otocinclus spp.
• Adult Size: 2 inches
• Difficulty Level: Easy
• Temperament: Peaceful
• Tank Size: 10+ gallons
• Diet: Algae eaters, feed wafers and vegetables like zucchini
• Origin: South America, Argentina, Venezuela
• Temperature: 70-74°F
• Swimming Level: Bottom, midwater, top

Otocinclus are probably the best algae-eating fish species for small tanks. Their vegetarian diet means they can be kept safely with even the smallest shrimp.

Otos spend a lot of the time grazing on algae on the walls of the aquarium and other surfaces like driftwood and leaves. They can be very active though and enjoy swimming around at speed in groups of at least 6.

How To Set Up Your Tank

If there’s a specific type of fish that has caught your eye, it is best to set up your tank to suit the needs of the species. The minimum tank sizes listed for freshwater fish species are a good guideline, but if you have the space, choose a tank a little larger to make sure they will be comfortable in their new home.

Filtration

Good filtration is vitally important for maintaining a healthy environment for the freshwater fish in your nano tank. The general rule is to opt for a filter model that can process the total water volume 4-6 times every hour. For smaller tanks, a power filter may make more sense. When using nano fish in a planted tank or aquascape, a canister filter is a good option to handle the added bioload of plant waste.

Some species, like Betta fish for example, really don’t enjoy a strong current in small tank sizes so you might want to look at directing the filter’s outflow in a way that breaks up the water flow, use an air-powered filter like a sponge filter. You can also put a sponge on the intake to keep the fish’s long fins from getting caught.

The Nitrogen Cycle

One of the most difficult concepts for beginner aquarists is the nitrogen cycle. There are loads of great resources out there to help you understand this process in-depth, but I’ll give you a quick run-down of the basics here.

A chemical known as ammonia is released into the water in fish waste and uneaten fish food. Before this chemical can be made safe for your fish, it has to go through two changes.

First, it is changed into a substance known as nitrite (still dangerous) and finally into nitrate (safe). These changes are made by special bacteria that naturally colonize your tank and your filter.

The process of building up colonies of these helpful bacteria takes a little while, and that’s why you need to cycle your tank for a month or so before introducing your first new fish.

Water Quality

Having a good quality filter set up and let your tank cycle fully are the first steps towards maintaining great water conditions in your nano freshwater aquarium. You’ll also need to perform a regular partial water change because the nitrogen cycle and your filter alone often can’t manage all the waste and uneaten food in your fish tank.

Make sure you use a water conditioner in the new water you’re putting into your aquarium. Some important tips for keeping your water quality high are to make sure to stock your nano tanks appropriately and to be careful not to overfeed your fish.

Growing live plants can also help to maintain good water quality. Many freshwater plants are really good at absorbing excess nutrients which can really help to maintain good water conditions.

Substrates

If you’re keeping an unplanted fish tank, your choice of substrate will mostly come down to what looks best to your eye. Often, darker colored substrates make the beautiful bright colors of freshwater fish like Neon Tetras really pop.

If you plan on setting up a planted tank, you may as well start out with a great aquarium soil like Fluval Stratum. If you’ve already set up your nano tank with gravel or sand, don’t worry, root-feeding aquarium plants can still be fed with root tabs.

One specific point to note is that the cories, which are really popular fish, should not be kept over sharp gravel, and they prefer a sand substrate. This is because they like to dig through the sand to look for food, and sharp edges can really damage their mouths.

Hiding Places

Providing plenty of hiding places in your nano tank can often help to keep your fish more confident and healthy. Live plants work for this, or you can make a cave with driftwood or rocks.

An easy alternative is to use a fish-safe aquarium cave ornament. Hiding places gives any fish that are being bullied or harassed a place to rest, and also keeps fry and baby shrimp safe from hungry fish.

The Planted Aquarium

Freshwater nano fish are probably the best tank mates for aquarium plants because they don’t do any harm to the plants, and many of these little fish just love swimming through and hiding amongst live plants. Some great plant species for nano tanks include:

• Anubias Nana
• Dwarf Hairgrass
• Dwarf Sagittaria

Check out some of my growing guides in the links above for more great information.

Biotopes

Creating a biotype is really just the process of trying to recreate the natural look and feel of the environment where your fish naturally originate. A great biotope would be a community tank with live plants and species of fish that occur together in nature. For example, an Amazon river basin biotope could have fish like tetras, pencilfish, and corydoras, with plants like Amazon Sword.

Where To Buy

The freshwater nano fish in this list are all very popular and most can be found at your local fish store. Nano species can be pretty fragile little creatures, so I recommend a trusted online retailer.

FAQs

Closing thoughts

Does the world of nano aquariums sound interesting to you? If so, any of the 21 amazing fish species in this list would look great in your own nano aquarium. The possibilities are really endless once you begin to explore the world of miniature fishkeeping. Please comment below if you have any questions. Happy fishkeeping!

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📘 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.

Table of Contents

• What Most Care Guides Get Wrong About Harlequin Rasbora The Classic Schooling Fish for Community Tanks
• Frequently Asked Questions
• Species Of Overview
• Classification
• Behaviour: What to Expect 
• What Do They Look Like?
• Harlequin Rasbora Care Guide
• Tank Mates 
• Is the Harlequin Rasbora The Classic Schooling Fish for Community Tanks Right for You?
• What Do They Eat?
• Diseases That Affect The Rasboras
• Conclusion 
• Recommended Video

The Harlequin Rasbora is one of the most popular freshwater fish for a reason, but popularity does not mean it is indestructible. It needs soft, slightly acidic water and a group of at least eight to school properly. Keep three in hard, alkaline water and you get stressed, pale fish that hide instead of school. The difference between a good setup and a bad one is obvious with this species.

Everyone’s kept harlequin rasboras. Almost nobody has kept enough of them.

What Most Care Guides Get Wrong About Harlequin Rasbora The Classic Schooling Fish for Community Tanks

The most common mistake I see with harlequin rasbora the classic schooling fish for community tankss is keeping too few. Guides will say “minimum 6” and leave it at that. In reality, these fish behave completely differently in a proper group of 8 to 10 or more. Keeping just 3 or 4 often leads to stress, hiding, and fin nipping that wouldn’t happen in a larger school. Another thing most guides miss is how much lighting and decor affect this species. Harlequin Rasbora The Classic Schooling Fish for Community Tankss look washed out under bright white LEDs on a light substrate. Dim the lights, add some tannins, use a dark background, and you’ll see colors you didn’t know they had. I’ve also noticed that many care sheets recommend overly broad water parameters. Yes, harlequin rasbora the classic schooling fish for community tankss are adaptable.

Frequently Asked Questions

How many harlequin rasboras should be kept together?

Harlequin rasboras should be kept in groups of at least eight, with twelve or more being ideal. They are true schooling fish that display their most natural behavior, best coloring, and lowest stress levels in larger groups. A school of twelve in a planted tank is a stunning sight.

Are harlequin rasboras good community fish?

Harlequin rasboras are among the best community fish available. They are peaceful, hardy, and compatible with a wide range of tank mates including tetras, corydoras, gouramis, and shrimp. Their calm temperament makes them suitable for nearly any peaceful community tank.

How big do harlequin rasboras get?

Harlequin rasboras reach about 1.75 to 2 inches in length. Their moderate size makes them suitable for tanks of 20 gallons or larger when kept in a proper school. Despite their small size, they are robust and hardy fish.

Can harlequin rasboras live with bettas?

Harlequin rasboras are one of the most recommended tank mates for bettas. They are fast enough to avoid aggression, stay in the mid-water level, and their muted coloring does not trigger territorial responses from most bettas. A 20-gallon or larger planted tank works best for this combination.

How long do harlequin rasboras live?

With proper care, harlequin rasboras typically live 5 to 8 years in captivity. They are hardy fish that tolerate a reasonable range of water conditions. Stable parameters, a varied diet, and a stress-free school environment are the keys to longevity.

Species Of Overview

Scientific Name	Trigonostigma heteromorpha
Common Names	Harlequin Rasbora, lamb chop rasbora
Family	Cyprinidae
Origin	South and Southeast Asia
Diet	Omnivore (they aren’t picky eaters)
Care Level	Easy to Care For
Activity	Calm, friendly and active
Lifespan	5 to 8 years
Temperament	Peaceful
Tank Level	Midwater
Minimum Tank Size	10 gallons
Temperature Range	71 ° to 80 °F
Water Hardness	6 to 8 dkH
pH Range	6.0 to 7.8, with 6.5 being the optimum
Filtration/Water Flow	Moderate
Water Type	Freshwater
Breeding	Egg spawners
Difficulty to Breed	Very Difficult to Breed
Compatibility	Community tanks
OK, for Planted Tanks?	Yes

Classification

Order	Cypriniformes
Family	Danionidae
Genus	Trigonostigma
Species	T. Heteromorpha (Duncker, 1904)

Everyone wants these colorful fish in their aquarium because of its cheerful disposition and glistening patterns. Fortunately, this is a beginner-level tropical fish so it isn’t too difficult to keep it healthy.

Behaviour: What to Expect 

The first principle of keeping this fish healthy is to understand its basic features and behavioral patterns.

Harlequin Rasboras are a peaceful fish. They aren’t wily creatures that will drive the other fish crazy around the aquarium. 

Depending on the company they are kept with, you will see the behavior of these fishes change accordingly. If you pair them with aggressive fish, they will become reclusive. They will find a corner in the aquarium and stay in hiding most of the time. These fishes become somewhat nervous around will exhibit boisterous energy. 

However, if you keep them with friendly company, they will flourish. These shoaling fish like to stay in the middle of the community tank with their gang when they feel safe. 

If they are found near the surface of the water or its substrate, there’s something wrong. 

Sometimes Rasbora becomes timid if new fish are introduced in the aquarium. So it would help if you kept an eye on them after introducing new fish in their tank. If your Rasboras don’t come out of hiding, then the new fish isn’t good company for them. However, there is nothing to worry about if they do come out of hiding. It’s natural for them to take their time before they trust the new fish.  

But don’t be reluctant about introducing new fish into their tank. If there are plenty of fish around to school with, Harlequins are at their best behavior. The more fish in the school, the better. 

If they are in a big school, you might see some of them nibbling at each other occasionally but that is nothing to be concerned about – this behavior is quite playful and typical from time to time. 

However, you might see one or two Rasboras become slightly aggressive is when they are spawning. The pregnant rasbora females need a secure place for their eggs, so that they might become vigilant towards other fish coming too close to their spawning area. 

However, this behavior is rare because it is tough to breed Rasboras in the first place. And in any case, if you want to breed Rasboras, transfer them into a separate breeding tank to increase chances of success. 

What Do They Look Like?

Harlequin rasboras look orange but that’s only a gradient on their silver body. The orange hue runs down from dorsal fins and fades away around the mid-region. A little bit of the orange gradient runs from its tail too, but just as well, it fades off beautifully into the rest of the colors. 

Their tall mid-section tapers near the mouth and the tail. In the rear part (abdominal region) of the Rasbora’s body, there is a dark black triangular patch characteristic of their uniqueness. 

Rasboras generally grow around 2 inches in length. They might grow to become slightly bigger than that if you are keeping them in ideal conditions and larger aquariums. 

One curious thing about them is that their fins change in hue depending on their tank’s conditions and mood. Their fins turn darker in color if their water is unclean or if they are under stress. And if the fish contracts any disease, their fins will always be the first part of their body to show signs on it. 

Male and female rasboras are similar in size and description. However, the black patch is slightly bigger on the male. Also, males seem to be a bit more orange than the females. The females have more of a golden hue on their entire bodies. And if you see that the belly of a female harlequin rasbora is turning bright, it means there are eggs in its little pouch. 

The appearance of the harlequin rasbora will not seem too extraordinary to you. Still, since you’re reading this article, we’ll assume that you have seen a school of harlequin rasbora swim together. 

Rasboras are shoaling fish that are at their best when they’re together with their bunch. When a school of harlequin rasboras swim together, the features of their body display cool colors and patterns by corresponding in a peculiar manner that is truly impressive to behold. 

Natural Habitat of Harlequins 

Harlequin rasbora (Trigonostigma Heteromorpha) are freshwater fish from tropical habitats like rivers, swamp forests, and streams. There are many variables involved here but water chemistry, tank water temperature, and pH value stay the same throughout all of these habitats. 

Swamps generally have soil substrates that are full of water, but riverbeds are pretty sandy. So you see, there are quite some differences here. The common denominator in both these habitats are aquatic plants. Harlequins like plants very much; when they become timid, they hide behind plants to feel safe.  

Harlequin Rasbora Care Guide

These small freshwater fish are accustomed to living in shallow water with an abundance of plant life.

In their natural habitat, the pH of the water is pretty low. However, the harlequins that you will find in the market have been bred in higher pH. 

If you got your Rasboras from the store, ask them in which pH these fish were bred. Generally, commercially bred Rasbora stay healthiest if kept in a pH range of 6.8 to 7.8. 

The alkalinity of water should be around 6 to 8 dkH for store-bought Rasbora. If the alkalinity falls or drops, your fish will become weak due to an inability to get rid of metabolic wastes.  

The temperature of the water should be 71 to 80 degrees Farenheit. If the temperature goes above this level, oxygen solubility of the water will decrease and your fish will become lethargic.  

So the water plays the most critical role in keeping the fish healthy. Make sure always to keep the water conditions at an optimum level. Here’s what you need to do.

Tank Size

You can keep harlequin rasboras in a 10-gallon tank. Bigger tanks are always better, because these are shoaling fish that don’t like to isolate or stay dormant. So whatever you do, make sure that you don’t go with anything smaller than 10 gallons. 

One rule of thumb is to get a pair of harlequin rasbora for every 2 gallons of water. That way, you get to keep 10 in a 10-gallon tank.

However, we would strongly suggest you get a bigger tank because the fish will thrive better in a bigger space where they can swim more freely. 

Tank Preparation

This is the main deal. If you get a decent tank but set it up incorrectly, the health of your Rasbora will still keep deteriorating. 

Make A Substrate: Create a soft substrate at the bottom of the tank. Use soil, sand, or gravel to mimic the riverbed or the swampy substrates. 

The substrate is just to create the same atmosphere as the fish had in their natural habitat. These fish aren’t bottom-dwellers, so you’ll rarely see them poke around near the bottom but you still have to create a suitable habitat for them with the substrate. 

Add Plants: Put some nice, aquatic plants in the tank so that your harlequin rasbora can go into hiding if they feel stressed or threatened in any way. You can also add rocks and other ornamental artifacts in the aquarium to make the tank atmosphere aesthetically pleasing. 

Control Water Parameters: Use a heater to control the temperature of water against the changing temperatures outside. Stick a thermometer onto the tank and keep an eye on it to check the temperature of the water from time to time.  

Setting Up A Breeding Tank For the Harlequin Rasbora

It isn’t easy to breed a rasbora in a regular community tank at home because they need very specific conditions for successful fertilization to occur. 

You need to transfer the breedable Harlequins to a separate tank and create the perfect breeding conditions. 

Put soft water in the tank, aim to stay within 1.5 to 2.5 dkH of their preferred hardness of 7. The temperature should be 71 to 80 degrees Fahrenheit. Then put in their favorite plants – Cryptocoryne. This plant has broad leaves that are perfect for them to hide behind while they’re spawning. 

Keep the breeding tank in low light, because bright lights make Rasboras somewhat nervous.

If the tank conditions aren’t perfect, then the fish won’t be fully fertile. So learn how to make soft water and how to adjust the pH of water before you attempt this. 

For more information on the intricate details of the actual breeding process, watch this video from Mark’s Aquatics. 

Is the Harlequin Rasbora The Classic Schooling Fish for Community Tanks Right for You?

Before you add a harlequin rasbora the classic schooling fish for community tanks to your tank, it’s worth asking whether this species actually fits your setup and your goals. Here’s a quick breakdown to help you decide.

This species is a good fit if:

• You have a large enough tank to manage territories. Cramped conditions amplify aggression.
• You’re comfortable managing aggression through stocking ratios, line of sight breaks, and tank layout.
• You can commit to regular water changes. These fish produce more waste than many smaller species.
• You’re not planning a peaceful community tank. Harlequin Rasbora The Classic Schooling Fish for Community Tankss need tank mates that can hold their own.
• You enjoy watching active, interactive fish. Cichlids have personality that smaller species simply don’t match.
• You have backup plans. Sometimes a particular fish just doesn’t work out, and you need a way to rehome it.
• You’re feeding a varied, high-quality diet. Color and health depend on nutrition.

If most of those points line up with your setup, the harlequin rasbora the classic schooling fish for community tanks is worth serious consideration. If several don’t, it’s better to choose a species that matches your tank now rather than trying to make it work.

Tank Mates 

Rasboras are schooling fish, so they like to swim around with a lot of tank mates. Don’t keep them on their own because they will become shy and reclusive. While they look to be around many types of fish, you still will need to be meticulous when choosing their company. It will help if they are kept in the company of fish with which they can be cheerful and active but never fall prey.

Good Tank Mates

The good news is that plenty of magnificently colored peace-loving fish can be kept with schools of Harlequin Rasboras. Here are just a few fish and inverts that work well: 

• Others of their own species 
• Shrimp
• Guppies 
• Snails 
• Cory Catfish 
• Tetras (Like Neon, Cardinal, and Black Skirt)
• Mollies 
• Platies
• Plecos
• Danios 
• Dwarf Gourami
• Hatchetfish
• Zebra Loaches 

Bad Tank Mates

Any fish that is twice the size of your Harlequin Rasboras shouldn’t be kept in the same tank with it. They say it’s better to be safe than sorry. So you should keep your fish safe in the tank to avoid feeling stressed out about them during the day. Some of the fish that you should definitely avoid are:

• Betta fish
• Bala Sharks
• Redtail Sharks
• Cichlids
• Barbs
• Fish with different water chemistry requirements like Goldfish

Note: Some Betta fish lovers will argue that Betta fish is too slow a swimmer to ever harm the Harlequin Rasbora. However, this can still be a mixed bag. For one, a school of Rasbora can feed quickly and leave a Betta with very little to eat. There are also more athletic Bettas like Plakats that can potentially harass your Rasbora school. The Betta and the Rasbora will likely come close if they live in a tank together – especially if the tank is small. So if you want to protect your rasboras, we suggest you to not take chances with a Betta fish. 

What Do They Eat?

Thankfully, harlequin rasboras aren’t fussy eaters. They are omnivorous, so they will eat pretty much anything starting with zooplankton, worms, crustaceans, and small insects that are edible. All you have to do is make sure that the food isn’t toxic for them. 

Since you want your rasboras to be healthy, take some out to condition them to a healthy, all-inclusive harlequin rasbora diet by introducing a variety of foods to them in tiny amounts. Do note that they have tiny mouths, so it’s better to not give them anything that isn’t bite-sized. 

When they first come to live in your aquarium they will be a bit shy, so you need to draw them out by giving them proper foods. Start off with herbivore fish foods such as Algae Wafers and Spirulina. Give them good quality fish food, a range of greens like blanched spinach, water lettuce, and then slowly introduce them to live food and frozen food. A good staple food to try is Xtreme Aquatics Nano formula. 

Rasboras are particularly found of Daphnia, shrimp, blackworms, and bloodworms. They will eat these meaty options live and frozen. When you give them live food, they will become overly enthusiastic and chase it around for a bit before eating it – it’s quite adorable to watch, really. 

Diseases That Affect The Rasboras

Rasboras are hardy fish from the streams, rivers and swamps, so they don’t get sick easily. Here are some of the diseases that might inflict suffering on your beloved fish. 

Fungal Infections

This is the most common disease that Harlequin Rasboras get. If left untreated it starts to damage vital organs like liver, brain, lungs, etc. 

Cause: Ichthyosporidium, Exophiala sp., and Flavobacterium columnare

Signs: Patches on the gills and skin, slimy layer on the surface of their skin, and skin turning brown.

Treatment: Isolate the infected fish from its tank mates, add aquarium salt in water, get rid of chlorine from the tank water, increase the water temperature to 77 Fahrenheit, and try an over the counter medication like API Fungus Cure.

Ich/White Spot Disease  

This persistent disease is another widespread one for rasboras. External parasites will cling onto the fish’s body and cause white spots to appear on its skin and gills.

Cause: Ichthyophthirius Multifiliis (an Ectoparasite), contact with other infected fish, sudden shifts in the water temperature of the aquarium, decorative plants that have parasitic cysts on them.     

Signs: Crystals formation on the body, skin becoming slimy, asthmatic breathing, itching against rough surfaces, and hiding for days on end.    

Treatment: Bring the water temperature up to 71.8 to 86 degrees Fahrenheit, or try an over the counter medication like Ich-X. 

Columnaris 

This disease is highly contagious, but it only affects freshwater fish. 

Cause: Low oxygen levels in the tank, and temperature of 80 Fahrenheit degrees.

Signs: Ulcerations on the skin, visible accumulation of mucus in its gills, and dorsal fin, noticeably long periods of time gone without eating.  

Treatment: Stabilize the water temperature, and consult the vet for antibiotics or try an antibiotic like API’s Furan-2. 

Dropsy 

This is basically kidney failure. Water and other fluids accumulate in the body and cause swelling in the abdomen. 

Cause: Aeromonas bacteria, water with excess ammonia and nitrites. 

Signs: Irregular swimming, gills losing color, scales standing out, stringy faeces, and bloating belly. 

Treatment: See the freshwater disease link posted above.

Fin and Tail Rotting 

The tissues of the tail and fins start rotting outwards in. The rotting might start from a wound that your fish already has, and it also may happen because of unclean water. 

Cause: Dirty water, overfeeding, low-nutrition food, and high levels of stress. 

Signs: It starts with inflammation of the fins. Then the fins start to lose color and eventually start becoming very fragile. 

Treatment: Clean the water, optimize the temperature and pH of the water in the tank. Use a medication like SeaChem KanaPlex.

Conclusion 

To watch your Harlequin Rasboras live their best life, make sure you keep them with friendly tank mates. Remember to give them proper sustenance, remove any excess leftover from their waters, and do remember to clean the entire tank every 2 to 3 weeks. May your beautiful Harlequin Rasboras live long and keep many more of your guests in awe! 

We hope you didn’t have any trouble following our instructions about proper Harlequin Rasbora care. With a little bit of mindfulness, you can keep your fish very active and healthy. Best of luck! 

Meta: Learn Harlequin Rasbora care, and give your beautiful rasboras their best life.

How the Harlequin Rasbora The Classic Schooling Fish for Community Tanks Compares to Similar Species

Choosing between similar species can be tricky. Here’s how the harlequin rasbora the classic schooling fish for community tanks stacks up against some common alternatives.

The harlequin rasbora the classic schooling fish for community tanks occupies a specific niche in the aquarium hobby, and direct comparisons really depend on what you’re looking for. In my experience, the most common question people ask is whether they should choose the harlequin rasbora the classic schooling fish for community tanks or something similar that’s more widely available. The answer usually comes down to three things: tank size, water parameters, and what other fish you’re keeping. If your setup matches what the harlequin rasbora the classic schooling fish for community tanks needs, it’s hard to beat. If not, there are usually alternatives worth exploring.

Recommended Video

Check out our rasbora video where we cover the most popular rasboras in the hobby:

This guide is part of our Rasboras & Danios: Complete Species Directory. Visit the hub page to explore care guides for all popular rasbora and danio species.

Convict cichlids are one of the most personality-packed fish I’ve kept in 25 years in the hobby. They’re tough, opinionated, and genuinely entertaining to watch. Honestly, I’d pick a convict over most “beginner” fish any day of the week. Especially when a pair forms and starts breeding. I’ve seen them successfully defend a corner of a 55-gallon tank from fish twice their size, which tells you everything about their temperament. If you want a cichlid that’s easy to keep but never boring, this is a great choice.

The cichlid that breeds whether you want it to or not.

What Most Care Guides Get Wrong About Convict Cichlid

The biggest misconception I see repeated everywhere is that convict cichlids are great beginner community fish. They are not. They are great beginner cichlids, but that is a completely different thing. A pair of convicts in breeding mode will terrorize every other fish in a 55-gallon tank. I have watched a 3-inch female convict chase a 6-inch severum into a corner and keep it there for days. The other myth is that they need a 30-gallon minimum. Technically you can keep a single convict in a 30, but a breeding pair needs 55 gallons minimum to give tank mates any chance of survival.

The Reality of Keeping Convict Cichlid

Convicts are bulletproof when it comes to water parameters. That part of their beginner reputation is earned. But everything else about keeping them requires planning.

Breeding is inevitable. If you have a male and a female, they will breed. There is no “if.” They will spawn on rocks, on driftwood, on the glass, on the filter intake. Then they will do it again three weeks later. You need a plan for fry before you buy a pair, not after.

Aggression escalates during breeding. A pair guarding fry will attack anything that moves. Fish twice their size get chased. Tank mates get pinned in corners. In a small tank, this can result in dead fish. You need enough space for other fish to escape, and you need tank mates tough enough to take the pressure.

They redecorate constantly. Convicts dig. They move substrate, excavate under rocks, and rearrange your tank to suit their nesting preferences. Lightweight decorations get toppled. Plants near their territory get uprooted. Accept it or choose a different fish.

Population control is your responsibility. A single pair can produce 200+ fry every few weeks. If you do not cull, separate, or rehome fry, your tank will be overrun within months. Local fish stores may not want common convict fry. Have a plan.

Biggest Mistake New Convict Cichlid Owners Make

Buying a pair without a plan for fry. It sounds simple, but this is the mistake that overwhelms more convict owners than anything else. You buy two fish, they breed within weeks, and suddenly you have 50 to 100 fry with no idea what to do with them. Three weeks later, there are 100 more. The breeding never stops. Have a fry plan before you buy convicts, or buy only one sex.

Expert Take

Convict cichlids are the best fish in the hobby for witnessing real parental behavior. The way both parents defend their fry, herd them around the tank, and share guard duty is genuinely remarkable. But that same parental instinct is what makes them dangerous in a community tank. If you want the breeding experience, set up a dedicated convict tank and enjoy the show. If you want a community fish, look elsewhere.

Table of Contents

• Brief Overview
• Classification
• Origin and Habitat
• Appearance and Size
• Average Cost
• Ease of Care
• Feeding Requirements
• Temperament
• Tank Requirements
• How To Breed
• FAQS
• In Conclusion

Convict cichlids breed whether you want them to or not. Once they pair off, they will attack everything in the tank to protect their fry, and they will keep spawning every few weeks until your tank is overrun. They are tough, aggressive, and prolific. I have seen beginners buy two convicts and end up with 200 within six months. If you are not prepared for that, you are not prepared for convicts. The cichlid that breeds whether you want it to or not.

The Reality of Keeping Convict Cichlid Care

The aggression reputation is earned but misunderstood. Convict Cichlid Care is not randomly violent. It is territorial, and territory disputes in a poorly planned tank look like chaos.

Group size controls behavior. Keep too few and you get a bully. Keep enough and aggression spreads out. There is a threshold, and missing it ruins the tank.

Most problems are stocking problems. The fish is not the issue. The tank plan is the issue.

Biggest Mistake New Convict Cichlid Care Owners Make

Keeping too few. A small group of Convict Cichlid Care creates a hierarchy where the bottom fish gets destroyed. The solution is not fewer fish. It is more fish to spread aggression.

Expert Take

Stock heavily, filter aggressively, and provide sight breaks throughout the tank. Convict Cichlid Care is manageable when you control the environment. Let the environment control itself and this fish exposes every weakness.

Brief Overview

Scientific Name	Amatitlania nigrofasciata
Common Names	Convict Cichlid, Zebra Cichlid
Family	Cichlidae
Origin	South America
Diet	Omnivore
Care Level	Easy
Activity	Very Active
Lifespan	8 to 10 Years
Temperament	Aggressive
Tank Level	Midwater
Minimum Tank Size	30 gallons
Temperature Range	74°F. 84°F
Water Hardness	9 – 20 dkH
pH Range	6.5 to 8.0
Filtration/Water Flow	Moderate
Water Type	Freshwater
Breeding	Egg layer
Difficulty to Breed	Easy
Compatibility	Can live in community tanks with certain tank mates that can stand up to the convict cichlid’s aggressive nature.
OK, for Planted Tanks?	With caution

Classification

Taxonomic Rank	Classification
Common Name	Convict Cichlid
Scientific Name	Amatitlania nigrofasciata
Order	Cichliformes
Family	Cichlidae
Genus	Amatitlania
Species	A. Nigrofasciata

Origin and Habitat

As a freshwater fish, the convict cichlid resides in Central American rivers and streams.  This species is found in Honduras, Guatemala, and El Salvador¹. 

The convict cichlid’s natural habitat consists of gently flowing water and sandy substrate.  Its rivers and streams contain rocks and driftwood, giving these fish discreet places to hide.    

Appearance and Size

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Want to know why this fish is called convict?  Just take a look at its black stripes.  This pattern looks like a prison uniform.

The exact number of stripes, or bars, depends on the particular fish, but most have about eight or nine.   

Although the convict cichlid is white with black bars, other colors include plain white, pink, and gold.  Some of these relatively rare varieties lack the stripes that these fish are known for.      

For most fish species, the male is more colorful.  But that’s not the case for convict cichlids.  Instead, it’s the female convict cichlid that has more color. 

When the female matures, an orange mark appears on her side.  When the male Convict Cichlid matures, a nuchal hump is seen on his head.    

The convict cichlid is on the smaller side, with an average length of 4-5 inches.  However, some males can grow up to 6 inches long. 

Average Cost

It’s not hard to find a convict cichlid for sale.  This fish is very popular and easy to breed, motivating fish stores, online stores, and breeders to sell the convict cichlid.

And that’s good news for you because it keeps the price pretty affordable.  You will probably only pay about $5-$12 per fish if you find the locally.      

Ease of Care

The convict cichlid is super easy to take care of, making it a beginner-friendly fish.  Maintaining the proper water conditions, creating the right environment, and feeding your convict cichlid are simple, straightforward tasks.     

In addition, this species is easy to breed.  It’s just a matter of putting a male and female convict cichlid together, giving them the right environment, and providing plenty of space.  If you do that, you will likely have fry in no time! 

Feeding Requirements

Speaking, a convict cichlid’s diet should mostly consist of pellets.  But you will also want to include foods that wild convict cichlids consume.

As omnivores, this fish eats insects, mosquito larvae, and plants.  That’s why it’s a good idea to supplement your aquarium convict cichlid’s diet with live foods and blanched vegetables. Roughage is key to avoiding the dreaded Malawi Bloat that types many cichlids.

Some examples include:

• Blood Worms
• Black Worms
• Daphnia
• Brine Shrimp
• Tubifex Worms
• Lettuce 
• Broccoli
• Carrots

Although fresh foods are always best, frozen worms and shrimp are also fine.  And don’t be afraid to throw some insects and mosquito larvae into your convict cichlid’s diet.  If you can manage to get these foods, your fish will love them! 

As far as pellets go, look for a cichlid-specific option.  And whatever you do, don’t settle for anything less than high-quality food. 

Cheap pellets will save you money, but they will only end up hurting your fishy friends in the long run. That’s because poor quality food leads to poor health. An example of a high quality Cichlid food would be Ron’s Cichlid Food.

If you prioritize high-quality food, your cichlid fish will thrive.  Plus, they will look amazing in your tank. You can’t ask for more than that!

Besides choosing the right food, you must also decide when to feed your fish.  It’s easier to feed once per day, but it’s probably better to feed several smaller meals throughout the day.  About 2-3 meals will do.

These smaller portion sizes will prevent tank water pollution, which helps to keep water conditions just right.  And that will further contribute to the health and appearance of your convict cichlid. 

Temperament

The convict cichlid is an aggressive fish, always ready to defend their territory.  Their combative nature increases during times of breeding as they protect their spawning areas. 

All that being said, they are still a delight for fish owners.  As long as you can keep their aggression at bay, their personality will keep you entertained.    

Fortunately, you can prevent fish fights from occurring.  All you have to do is make sure each convict cichlid has enough space. 

And if you will be keeping your fish in a community tank, just be sure to place them with compatible tank mates.  We will talk more about that later in this article.

You should also give your fish plenty of hiding places, such as rocks, plants, and driftwood.  These hideaways provide some much-needed privacy, which helps to keep the peace. 

When there is peace in your tank, you can enjoy observing your convict cichlid’s activities.  These activities may include digging, rearranging plants, and checking out the rest of the tank.      

All that activity is what makes them so fun to watch!

Tank Requirements

If you want your fish to thrive, you need to create an environment that matches their natural habitat as closely as possible. 

In this section, we are going to talk about how you can do that in your convict cichlid’s aquarium.

Make Sure the Tank is Large Enough   

Remember, the convict cichlid needs lots of space.  Forcing this aggressive species to share a small tank with other fish is just asking for trouble!

But how big should the tank be?

Here are some general guidelines:

• Some experts recommend 30 gallons per convict cichlid
• Others say 30-50 gallons is large enough for a pair of convicts
• If you have a breeding pair, you will need at least a 50-gallon tank.

If you want to play it safe, it is a good idea to choose a tank size that’s larger than what you think is necessary.  This is probably better than trying to get by with the bare minimum.      

Create the Right Conditions

The Convict Cichlid is a very hardy fish, meaning they can survive conditions that don’t perfectly match their natural habitat.  But surviving isn’t thriving.  To make sure your fish are as healthy and attractive as possible, you need to get the tank’s conditions just right. 

That involves maintaining the proper pH and temperature range.  This species requires these conditions:

• PH: 6.5-8
• Water Temperature: 74 -84 degrees

Keeping the water on the warmer side is important because this fish comes from South American rivers and streams.  So, if your tank’s water doesn’t stay within the optimal range, you will want to look into getting an aquarium heater. 

Choose the Right Substrate   

Convict cichlid fish have a tendency to dig, making it vital to choose the right substrate.  Something soft, like sand, will allow your fishy friends to dig away without getting scratched. 

When choosing between light and dark substrate, it all comes down to personal preference and your budget.  lighter substrates will be cheaper than darker options.  However, your beautiful fish will stand out even more against a dark substrate.  

Is the Convict Cichlid Right for You?

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

• Great if you want to observe breeding behavior. Convicts are prolific breeders and incredible parents. Watching them raise fry is one of the best experiences in the hobby.
• Perfect for keepers who want personality over color. They’re not the prettiest cichlid, but they make up for it with attitude and intelligence.
• Not ideal for peaceful community tanks. If you want a calm, harmonious setup with tetras and corydoras, look elsewhere.
• Good for beginners who are ready for aggression management. They’re hardy and forgiving on water parameters, but you need to be prepared to deal with territorial behavior.
• Skip if you don’t have a plan for fry. A breeding pair can produce hundreds of babies every few weeks. If you can’t rehome them, you’ll be overrun fast.
• Excellent choice if you have a species-only tank. A pair in a well-decorated 55-gallon is endlessly entertaining without the stress of managing tank mate aggression.

Provide Hiding Places

Logs, driftwood, rocks, and plants make great hiding spots for fish.  Adding these elements to your tank gives your cichlid fish plenty of privacy, which helps prevent aggressive behaviors. 

Look for tough plants that won’t be easily disturbed by digging.  By the way, we should probably mention that your convict cichlid will likely rearrange the plants. Plants that do not need to be planted in soil make the most sense. In our experience, these plants work best with Convicts:

• Java Fern
• Anubias
• Java Moss

These fish definitely have their own ideas about things!  But that’s partly why they are so amusing. 

Generate a Gentle Flow

Wild convict cichlids live in gently flowing water.  You can mimic this by installing a powerhead that generates a gentle flow.      

Choose a Good Filter System

What happens when your fish start digging?  If you guessed a mess, you are right! 

That’s why you must choose a good filter system that can keep up with that mess.  This becomes especially important if you plan on breeding your fish, as the new fry will increase the tank’s bio-load.

Your best bet is a filter that filters at least twice your tank’s volume per hour.  Some convict keepers use filters that filter 10-15 times the tank volume per hour. A filter with a large amount of media capacity is best like a canister filter.

Convict cichlid breeders need to take extra measures to keep the fry from being sucked into the filter. A quick fix is to buy and install a filter sponge. 

How To Breed

When it comes to breeding convict cichlids it is summed with a simple statement – convict cichlids are prolific, making this fish incredibly easy to breed.  There are just a few breeding tips to keep in mind. You can also check out this video by Blake’s Aquatics if you prefer a video explanation.

For starters, the water should be around 84 degrees.  So, keep an eye on the temperature to make sure it’s conducive to breeding. 

Secondly, the female convict cichlid naturally gravitate towards rocky overhangs to lay their eggs.  Turning a clay pot upside down or stacking flat rocks provides a similar laying space for your female fish.  

Thirdly (and this is very important to remember!) convict cichlids are extremely protective of their eggs.  If your convict cichlids are forced to breed in a community tank, they will view the other fish as threats and attack them.     

That’s why your breeding pair should be kept in a separate tank from all other fish, convicts or otherwise.

Also, the breeding tank should be large enough to house fry.  At a minimum, this requires a 50-gallon tank. 

Breeding and Raising Fry

Convict cichlids are ready to breed when they are about 4-7 months old.  After the female convict cichlid lays the eggs, the male fertilizes them.  Once the eggs have been laid, the breeding pair is on their guard, ready to defend their eggs from any threats. 

The eggs will hatch in 3-5 days, resulting in about 30 new fry.  After the eggs hatch, the parents care for the fry.  For the first 5 days, the fry remain in the yolk sac. After that, they start swimming around. 

Once the fry are about a week old, it’s time to start feeding them.  Some food options include baby brine shrimp, fry flakes, and infusoria. 

Fry should be fed about 3 times per day. It doesn’t take long for the male and female to be ready to breed again.  They will reenter the breeding mode about 10-14 days after the fry are born. 

At this time, the breeding pair becomes aggressive towards the fry.  To keep them safe, move the fry to a nursery tank, about 5-10 gallons large.   

Eventually, the fry will outgrow that tank.  The next step is to place them in a rearing tank, about 20-30 gallons large.

Important Note

Before moving on, we want to point out that convict cichlids have a great reputation for being excellent parents. The male and female will do whatever it takes to protect the fry while providing food and shelter. 

That being said, the father becomes a threat when the fry start swimming.  If any signs of aggression appear, the male Convict Cichlid should be removed from the tank.      

FAQS

Although a convict cichlid can live by itself, sharing the tank (as long as it’s big enough) with another convict can prevent stress. 

Just keep in mind, as the number of fish increase so does the risk of fights.  That’s why it’s probably wise for beginners to limit their convict cichlids to one or two.

Also, it’s not a good idea to put two male convict cichlids together as this will likely result in displays of aggression.        

And for those with more than two convict cichlids, it’s best to maintain a ratio of 3 females to one male. 

But for those with more experience, their convict cichlids can live in community tanks.  However, you can’t choose just any tank mates.  You have to carefully select certain fish that are most compatible with convict cichlids. 

That would not include fish that are smaller or less assertive than your cichlid fish.  Instead, you should pick tank mates that are larger and able to hold their own.  

Some good tank mates include:

• Green Terror
• Jack Dempsey
• Pictus Catfish
• Giant Danio
• Jewel Cichlid
• Firemouth Cichlid
• Rainbow Fish
• Oscar Fish
• Clown Loach
• Silver Dollar Fish
• Large Barbs
• Blue Acara
• Plecostomus

If your convict cichlid will live with tank mates, be sure to buy a large tank that’s at least 50 gallons.  Depending on how many fish you have, you will need a tank that’s even bigger than that.   

But no matter how experienced you are, how big the tank is, or what other types of fish you have, never ever keep a breeding pair in a community tank.  It just won’t end well!

That’s because this aggressive species becomes even more combative during breeding time. 

How the Convict Cichlid Compares to Similar Species

If you’re considering a convict cichlid, you’ve probably also looked at the firemouth cichlid. Both are Central American cichlids with strong personalities and manageable care requirements, but they’re quite different in practice. Firemouths are more bark than bite. They flare their gill plates to look intimidating but rarely follow through with real aggression. Convicts, on the other hand, will absolutely back up their threats. A breeding pair of convicts is significantly more aggressive than a breeding pair of firemouths, which makes firemouths a better choice if you want a Central American cichlid in a mixed tank. However, convicts are hardier, breed more readily, and have more engaging parental behavior. If you want to watch fish raise their young, convicts are the better pick.

The kribensis cichlid is another common comparison, especially for beginners wanting a breeding project. Kribs are smaller, less aggressive, and work much better in community tanks. But their breeding behavior, while interesting, isn’t as dramatic or involved as what convicts offer. Convicts are the full show. Aggressive defense, fry herding, and cooperative parenting that you simply don’t see at the same level with kribs.

What It Is Actually Like Living With Convict Cichlid

Living with convicts means accepting that you are not in charge of the tank. They are. The pair picks a spot, claims it, and defends it against everything. You watch other fish learn where the borders are and stay on the right side of them. It is like watching a tiny territorial dispute play out in real time, every day, and it never gets old.

The parenting is the real show. Both parents guard the eggs, fanning them constantly. When the fry hatch and become free-swimming, the parents herd them around the tank like a school of tiny grey dots, and any fish that comes too close gets hit. Hard. Watching a three-inch convict body-slam a fish twice its size for getting too close to fry is something you do not forget.

The fry situation escalates fast. First spawn, you are excited. Second spawn, you are looking for homes. Third spawn, you are searching online for “what to do with too many convict fry.” This is the reality nobody warns you about. Convicts are prolific beyond what most people are prepared to handle. If you do not have a culling strategy or a local fish store willing to take them, you will be overwhelmed within three months.

In Conclusion

Convicts do not ask permission to breed. They just do it, and your tank pays the price.

By this point, you are probably convinced that the convict cichlid is a great fish to keep, especially if you are brand new to this hobby.  They are super easy to care for, a blast to watch, and a beauty to behold. And when you provide great care, you will be able to enjoy your fish for a long time. 

Do you have any experience with Convict Cichlids? If so, leave a comment below and let’s start a conversation. Thanks for reading! 

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Table of Contents

• What Most Care Guides Get Wrong About Celestial Pearl Danio The Galaxy Fish That Took the Hobby by Storm
• Species Overview
• Classification
• Origins and Habitat
• What Do They Look Like?
• How Big are They?
• How Long Do They Live?
• Temperament and Activity Level
• What Are Good Tank Mates?
• What Do They Eat?
• Celestial Pearl Danio Care Guide
• Water Quality
• Breeding
• Health and Disease
• Where to Buy?
• Frequently Asked Questions
• Is the Celestial Pearl Danio The Galaxy Fish That Took the Hobby by Storm Right for You?
• How the Celestial Pearl Danio The Galaxy Fish That Took the Hobby by Storm Compares to Similar Species
• Closing Thoughts

The Celestial Pearl Danio is one of the most beautiful nano fish in the hobby, but it is also one of the most overhyped. Males are aggressive toward each other and will fight in small tanks. Females get harassed relentlessly without enough cover. This species needs a densely planted tank with more females than males, or the aggression becomes the only thing you notice.

The galaxy rasbora brought celestial beauty and terrestrial aggression to nano tanks everywhere.

What Most Care Guides Get Wrong About Celestial Pearl Danio The Galaxy Fish That Took the Hobby by Storm

The most common mistake I see with celestial pearl danio the galaxy fish that took the hobby by storms is keeping too few. Guides will say “minimum 6” and leave it at that. In reality, these fish behave completely differently in a proper group of 8 to 10 or more. Keeping just 3 or 4 often leads to stress, hiding, and fin nipping that wouldn’t happen in a larger school. Another thing most guides miss is how much lighting and decor affect this species. Celestial Pearl Danio The Galaxy Fish That Took the Hobby by Storms look washed out under bright white LEDs on a light substrate. Dim the lights, add some tannins, use a dark background, and you’ll see colors you didn’t know they had. I’ve also noticed that many care sheets recommend overly broad water parameters.

Species Overview

Scientific Name	Danio margaritatus
Common Names	Celestial Pearl Danio, Fireworks Rasbora, Galaxy Rasbora, Microrasbora sp. Galaxy
Family	Cyprinidae
Origin	Myanmar / South East Asia
Diet	Omnivore
Care Level	Moderate
Activity	Active
Lifespan	3 to 5 Years
Temperament	Peaceful
Tank Level	Midwater
Minimum Tank Size	10 gallons
Temperature Range	72°F – 76°F
Water Hardness	2 – 10 dKH
pH Range	6.5 to 7.5
Filtration/Water Flow	Strong
Water Type	Freshwater
Breeding	Egg-layer
Difficulty to Breed	Easy to breed; lays eggs
Compatibility	Species tank or community nano tank
OK, for Planted Tanks?	Yes – plants recommended

Classification

Kingdom	Animalia
Phylum	Chordata
Class	Actinopterygii
Order	Cypriniformes
Family	Cyprinidae
Genus	Danio
Species	D. Margaritatus (Roberts, 2007)

Origins and Habitat

The world first came to know of the celestial pearl danio in 2006, when a man called Kamphol Udomritthiruj discovered the fish in a plant-filled pond in a mountainous area near Hopong, east of Inle Lake, in Myanmar. He shared a photo of the fish on a Singaporean fishkeeping forum, and the rest is history¹.

The ponds, which are the natural habitat of the galaxy rasbora, are heavily vegetated. They are located in a place consisting mainly of rice paddies and grasslands, which receive a lot of sun exposure. This is what leads to the fast growth of aquatic plants in the ponds, which make the celestial pearl danios’ home.

Since that time, this species of fish has not been found in any other area. But unsurprisingly, this species has proliferated in the aquarium trade despite that. One look at it, and you’ll understand the reason behind their popularity.

Now, when the fish was first found, the genus they belonged to was contested. But aquarium traders needed to market the beautiful new celestial pearl danio, and doing this meant guessing their place in the world of cyprinidae. That’s how they came to acquire the common name of galaxy rasbora.

In 2007, a new genus was created solely for the celestial pearl danio by Tyson R. Roberts, a scientist with the Smithsonian Tropical Research Institute.

So, even though the name “galaxy rasbora” is still widely used to refer to this fish, it’s something of a misnomer, as it was discovered by Roberts that these little guys are more closely related to the danios than to the rasboras.

What Do They Look Like?

Before they were Danio margaritatus, these vibrant little nano fish were given the scientific name of Celestichthys margaritatus. “Celestichthys,” from the Greek and Latin, is “heavenly fish” translated. Meanwhile, “margaritatus” translates to “adorned with pearls.”

Heavenly fish adorned with pearls. That’s a pretty good place to start if you want to guess at the appearance of the Danio margaritatus.

These are some of the smallest fish in the aquarium trade, not measuring more than 1.5 inches. They are vividly colored fish, with a base coloration of deep midnight blue.

They are covered all over with bright yellow/white spots responsible for the galaxy-like pattern that gives them their name. Their bellies will take on an orange coloration.

The fins of the celestial pearl danio, meanwhile, have a prominent shape and size. A tall dorsal fin protrudes from the lower third of the body of the fish. The anal and pelvic fins are wide.

The fins will have a red or deep orange color which contrast gorgeously with the rest of their body. You’ll also see dual black lines and a few transparent parts on all the fins of the fish.

The sexual dimorphism of the celestial pearl danio means that it’s possible to identify their sex. Males will have a thinner shape and a brighter coloring than females. Meanwhile, the coloring of females can be more accurately categorized as golden blue than dark blue.

How Big are They?

When it is fully developed and sexually matured. Which takes about 3 months. The celestial pearl danio has an adult size of 1 inch in length. They can get as large as 1.5 inches.

This small body is why they are classified as a nano fish. They do best in large groups. Females and males differ slightly in size, with females being slightly larger.

How Long Do They Live?

In captivity, with appropriate conditions ensured, the average celestial pearl danio can be expected to live at least 3 years, and a maximum of 5 years. Like many other freshwater fish, celestial pearls respond poorly to stress and inadequate or unstable water conditions. Proper care, diet, and a low stress environment will contribute to a longer lifespan.

Temperament and Activity Level

Galaxy rasboras are mostly quiet, peaceful fish who love to swim together in groups, and they are curious explorers as well. Although they are not schooling fish as many wrongly think of them, celestial pearl danios are certainly very social, and you should aim to have at least 6-7 of these beauties in one tank.

When they all swim together, it creates a wavering, textured effect inside the aquarium that is truly awesome to behold. However, once they start getting used to their tank, they like spending time apart from the group as well.

The only concern when it comes to the behavior or temperament of the galaxy rasbora is related to their sex. It’s important to tell male and female pearl danios apart because a large number of males might cause a problem.

This is because males constantly battle over females, which unfortunately results in injury or, in the worst cases, even death. As such, you should keep fewer male CPDs in your aquarium than females.

What Are Good Tank Mates?

The best tank mates for a CPD are others of their kind. You should aim to keep at least 5-7 of these fish in the tank as they are a social species that love swimming together.

We stress once again that it’s very important to keep the number of female fishes higher than males, as having too many of the latter may lead to infighting for dominance.

Owing to their size, the celestial pearl danio also does well in nano tanks with other peaceful fish of the same size, such as guppies and neon tetras.

In fact, if you feel that your CPDs are much too shy or timid, introducing other fish might help them to feel more confident. In that way, suitable tank mates are a crucial part of celestial pearl danio care.

Given that galaxy rasboras like to occupy the middle of the tank, we recommend filling the tank with other species who stay near the top.

Good Tank Mates

With the above conditions in mind, the following make great tank mates for these danios:

• Tetras (regular, ember or green)
• Gouramis
• Cory Catfish
• Guppies
• Molly Fish
• Killifish
• Endler’s livebearer
• Amano Shrimp
• Cherry Shrimp

You will notice that all of these species are small, just like the galaxy rasbora. Remember, if you decide to place so many small fish together, you have to make adjustments to the aquarium size accordingly. Small fish like this also lend well to planted tanks and aquascapes as the small size makes them a part of the scape versus the showcase. Most aquascapes are all about the design. The fish are a part of the piece so smaller fish work well with this style of aquarium keeping.

Fish Species to Avoid

It’s very important to choose only tank mates who are of the same size as your pearl danios. Even if they are peaceful, any fish significantly larger than celestial pearl danios might eat them. Not to mention, there will be competition for food.

You should absolutely avoid putting your galaxy rasboras in with any aggressive fish, such as oscars, cichlids, or Jack dempseys. These fish will happily snack on and eat your prized Danios.

Other fish who may not eat them, may be bothered by the dithering nature of these fish. Slow moving fish like Betta Fish often clash with Danios due to their nature. They also don’t compete well for food.

What Do They Eat?

As they are omnivores, celestial pearls will eat almost anything in the wild. They usually love plants and algae as well as zooplankton and might consume small invertebraes for protein.

In captivity, they take well to diets of pellets and flakes, but these should be of high quality. Not to mention, the pellets/flakes should be small enough that they can fit easily in the tiny mouths of your pearl danios.

They like eating at mid-tank levels, so try to choose pellets and flakes that won’t sink so easily.

What About Live Foods?

Celestial pearl danios will eat live food you give them, such as live baby brine shrimp, krill, daphnia, moina, white worms, and grindal worms. Frozen cyclops and frozen baby brine also make great snacks for them and help you to provide a balanced diet.

How Much and How Often to Feed?

CPDs should be fed 3 to 4 times a day, but you should make it a point to give them small amounts of food every time. This prevents overfeeding or food wastage and keeps the water quality clean.

It’s also important to cycle the food you give to your galaxy rasboras. This will ensure that they live longer and retain their vibrant coloring throughout their lives.

Something else you need to know about these little guys is that they are prone to stress. And when this happens, it will affect their eating habits.

So not only should you strive to ensure stress-free living conditions for your galaxy rasboras, you should also watch them closely when it’s feeding time. This will allow you to identify the picky or shy eaters as well as the more active ones and cater to their needs accordingly.

Celestial Pearl Danio Care Guide

CPDs are easy to care of, given that you ensure the best tank conditions for them. These little guys thrive in cold water and love to have plants to play around in. Here’s all you need to know about setting up a tank for your CPDs.

Tank Size

As we’ve already mentioned above, the minimum tank size for 5-7 celestial pearl danios is 10 gallons (so about 2 gallons per fish). This gives them the space they need to play or hide as they wish.

You’ll need to increase the aquarium size by an extra 10 gallons for every 5 of these fish you add. So if you have 30 CPDs, you’ll need a tank of at least 30 gallons.

Tank Setup

Here are the particulars of the CPD fish tank setup:

Plants

When you’re setting up a tank for these little fish, it’s of utmost importance that you include plants to mimic the heavy vegetation of their natural habitat. These not only give the fish plenty of playing and hiding places, they also make for good snacks and provide ample space for breeding (if that’s one of your aims).

In fact, the more variety you can create in your aquascaping endeavors, the better for these fish. CPDs absolutely love these environments. So don’t hold back. Include any and all plants you wish to or think would go well with your aquarium or your fish. Keeping healthy, stress-free CPDs is not possible without plants. If you want to make these easier for you consider low energy or beginner level plants.

Substrate

As with plants, you have a wide variety of options when it comes to the aquarium substrate. Although they like swimming about in the middle of the aquarium, they also frequently stay towards the tank’s bottom half. Since they don’t dig, however, you don’t have to worry about substrate size.

That said, your chosen substrate should complement the plants you choose to place in the tank. Dark fine sand is a good option here as it will allow your plants to thrive and flourish, which is a requirement for keeping your danio fish happy. Sandy substrate is also easy to clean, an added benefit.

Decor

You have free reign when it comes to choosing decor for these fish as well. CPDs love having adequate spaces to hide and play in, so make it a point to include natural decor like rocks and driftwood where your fish can relax and play.

Water Quality

As with any other freshwater fish, it’s of crucial importance to maintain good water quality for the health of your danio fish. Here’s what you should know:

Filtration

CPDs require strong filtration in their tanks. The biology of this fish is not able to handle too many pollutants in the water. Canister or power filters should work fine, although you should remember to block inlet tubes with sponges to prevent these tiny fish from getting sucked into them. They are very active fish and enjoy moving around the tank. A moderate flow will be healthy for them.

Water Parameters

The rich vegetation found in the shallow ponds which these little fish inhabit give the water a clean and pure quality with low mineral and salt levels . These are the conditions you should aim to recreate for your CPDs if you want them to be happy and stress-free.

These are the basic recommended water parameters for CPDs:

• Water Temperature: 72°F to 76°F
• pH: 6.5 to 7.5
• Water Hardness: 2. 10 dKH

Aquarium Maintenance

As you know by now, taking care of these aquarium fish is pretty easy, given that you ensure clean water for them. Try to also keep levels of nitrates and dissolved organics low. Make regular water changes.

Test Water Conditions

In order to ensure proper water conditions for your aquatic pets, no matter if they’re CPDs or other fish, we recommend investing in a quality water testing kit. If you want a well-kept aquarium with healthy fish, accurate readings should be your first priority.

Breeding

If you want to breed your CPDs, you’re in luck because they’re one of the easiest aquarium fish to breed.

In fact, males of this fish species spend a good chunk of their time just courting the females (which, as we mentioned above, can lead to fighting and injury/death), which makes this a species that is constantly spawning. Pretty much daily.

So, triggering the breeding process of this fish shouldn’t require much input from you; just make sure you give your fish a steady and nourishing amount of live food.

Are Your They Male or Female?

As we discussed above, identifying the sex of this danio species is easy due to the species’ sexual dimorphism. Although they are similarly sized, your female CPDs will have a rounder shape and a duller body color in comparison to the males.

When a female is ready to spawn, she should develop a darkly colored, swollen spot near her anal fin. If you need a visual aid on determined if your danio is male or female, check out this video by The Secret History Living In Your Aquarium.

The Mating Process

How do you know when your CPDs are ready to spawn? Well, aside from the fact that both males and females try to breed almost daily after reaching maturity (which takes 3-4 months at most), there are some markers in behavior.

Males will typically hover near a spawning mop or Java moss (whatever you provide for spawning), and when a female is nearby, males will shake and flare their fins to attract her.

Once a male has caught her attention, a female CPD will swim down to where he is in the aquarium and nudge his anal fin with her head. Then they will shake together, releasing the eggs and milt.

The Breeding Process

CPDs are egg layers. To lay her eggs, a female CPD will find a spot in the tank where there is low water flow. She will usually also choose a large plant leaf to lay the tiny eggs. More than 30 at a time. So you should provide that once again.

You have to be alert and present during this process because male CPDs do eat their mate’s eggs. So as soon as you see that the eggs have been laid, gently take them out and put them into a designated spawning tank.

This also means that if you don’t want too many CPDs just leave the eggs as they are. They will be eaten by their dads and disappear from the aquarium.

After Breeding

Once they’re in the spawning tank, the eggs will take up to 2-4 days to incubate, after which you will see tiny fry beginning to hatch.

During this time, you should feed them micro foods. As they grow older and you move them into the main CPD tank, you can introduce them to live foods such as small worms and baby brine shrimp as well as flakes and pellets.  

Health and Disease

CPDs are not as prone to disease as other freshwater fish who are harder to care for. Nor have any diseases been discovered which are exclusive to CPDs.

That said, they are still prone to being afflicted by common freshwater diseases.

Signs of Health

A healthy CPD, although shy and fond of hiding at times, is a pretty social fish. He or she will spend a lot of time swimming in groups and playing a little bit. As eager breeders, CPDs also spawn almost every day.

Common Health Issues and Treatment

Fin rot, in particular, is noticeable in these fish. As with any other fish, this freshwater disease can be identified by visual markers on the edges of the fish’s fins. If the edges of the fins look discolored or frail, as if it’s disintegrating, you can assume fin rot has taken a hold.

Fin rot can be caused by a number of factors, the most common being poor water quality. However, it can be easily avoided if you constantly monitor pH levels with a good water testing kit.

Fighting is another cause of fin rot. You can prevent your CPDs by fighting by ensuring a low male-to-female ratio in the aquarium. The more males there are, the higher the level of aggression and competition will be, leading to injurious fighting.

If you do suspect fin rot, try to restore optimal water conditions as soon as possible. Then you can use antibacterial medications to treat the condition. The fins should begin to grow back.

Where to Buy?

Compared to other freshwater aquarium fish, CPDs do are more expensive, sometimes going up to $15 to $20 for just one fish. However, since they are active breeders, they’re not too hard to find in a well-stocked aquarium shop. You can also find them being sold online, but be careful and do your research.

Frequently Asked Questions

Is the Celestial Pearl Danio The Galaxy Fish That Took the Hobby by Storm Right for You?

Before you add a celestial pearl danio the galaxy fish that took the hobby by storm to your tank, it’s worth asking whether this species actually fits your setup and your goals. Here’s a quick breakdown to help you decide.

This species is a good fit if:

• You have a large enough tank to manage territories. Cramped conditions amplify aggression.
• You’re comfortable managing aggression through stocking ratios, line of sight breaks, and tank layout.
• You can commit to regular water changes. These fish produce more waste than many smaller species.
• You’re not planning a peaceful community tank. Celestial Pearl Danio The Galaxy Fish That Took the Hobby by Storms need tank mates that can hold their own.
• You enjoy watching active, interactive fish. Cichlids have personality that smaller species simply don’t match.
• You have backup plans. Sometimes a particular fish just doesn’t work out, and you need a way to rehome it.
• You’re feeding a varied, high-quality diet. Color and health depend on nutrition.

If most of those points line up with your setup, the celestial pearl danio the galaxy fish that took the hobby by storm is worth serious consideration. If several don’t, it’s better to choose a species that matches your tank now rather than trying to make it work.

How the Celestial Pearl Danio The Galaxy Fish That Took the Hobby by Storm Compares to Similar Species

Choosing between similar species can be tricky. Here’s how the celestial pearl danio the galaxy fish that took the hobby by storm stacks up against some common alternatives.

Celestial Pearl Danio The Galaxy Fish That Took the Hobby by Storm vs. Ember Tetra: These two species are considered together when stocking a community tank. The celestial pearl danio the galaxy fish that took the hobby by storm and ember tetra share some basic care requirements, but they differ in adult size, activity level, and how assertive they are with tank mates. The choice between them often comes down to tank size and the overall energy level you’re going for. Check out our Ember Tetra care guide for a detailed breakdown.

Celestial Pearl Danio The Galaxy Fish That Took the Hobby by Storm vs. Cherry Barb: These two species are considered together when stocking a community tank. The celestial pearl danio the galaxy fish that took the hobby by storm and cherry barb share some basic care requirements, but they differ in adult size, activity level, and how assertive they are with tank mates. The choice between them often comes down to tank size and the overall energy level you’re going for. Check out our Cherry Barb care guide for a detailed breakdown.

Closing Thoughts

Every nano fishkeeper wants Celestial Pearl Danios until they find out the males wage war in small tanks.

The breathtaking beauty and shy nature of CPDs make them a popular choice for aquarists interested in nano fish and dither fish. A group of CPDs makes a great addition to any large, well-planted freshwater community tank, given they don’t have any aggressive tank mates.

They’re easy to take care of and easy to breed if you ensure proper water conditions. Celestial pearl danios are definitely a rewarding fish to keep!

This article is part of our Rasbora Species Directory. Visit the hub page to explore all species care guides.

Recommended Video

Check out our danio video where we cover the most popular danios in the hobby:

This guide is part of our Rasboras & Danios: Complete Species Directory. Visit the hub page to explore care guides for all popular rasbora and danio species.