20 Peaceful Community Fish for Your Freshwater Aquarium (GUIDE)

Looking to keep things calm and friendly in your community aquarium? Some fish species are more assertive than others, with certain types being downright dangerous to their tankmates. If that’s not what you’re looking for, we can help. We’ve compiled a list of 20 peaceful community fish that won’t bother their neighbors and are 100% community proof!

20 Peaceful Community Fish: Our Top Picks

Here are our 20 favorite peaceful community fish for freshwater aquariums.

Cory Catfish (Corydoras genus)

aquarium catfish

Corydoras is a genus of small catfish, many of which are available in the aquarium hobby. Cory catfish are often seen as one of the ideal beginner fish species, as they are not just easy to keep but also easy to combine with other fish. Their peaceful nature means they won’t bother their tankmates, while their sturdy body plates protect them from nips and overly curious fish. They’re called armored catfish for a reason!

Which specific Cory catfish variety will work best in your aquarium depends entirely on what you’re looking for. Go for the tiny Corydoras pygmaeus if you’ve got a small tank, the lively Corydoras panda if you’re looking for something cheerful and the all-white albino Corydoras aeneus for something more unusual.

Cory catfish don’t have many demands when it comes to aquarium décor, although they do appreciate some cover in the form of plants and hides. Do make sure you don’t keep them on substrate that can damage their delicate barbels, like sharp gravel. Sand is ideal and allows the fish to burrow and forage as they naturally would.

Oto Catfish (Otocinclus genus)

oto catfish
By CHUCAO – Own work, CC BY-SA 3.0

Another genus of relatively small catfish, Otocinclus are about as peaceful as it gets. You won’t ever see this species bother its tankmates: even juvenile dwarf shrimp are supposed to be safe in its presence. The main explanation for the Oto catfish’ mellow attitude is its diet, as the species is pretty much 100% vegetarian and lives off algae and biofilm.

If you’d like to keep Otocinclus in your aquarium, keep in mind that they do need rather specific care to thrive. These catfish are quite fragile and won’t respond well to less than ideal water quality. You’ll have to keep an eye on your water values at all times and do regular slow water changes. Additionally, it’s a good idea to avoid any boisterous or overly assertive tankmates. Consider growing algae in a separate tank or tub so you can provide a constant supply.

Neon Tetras (Paracheirodon innesi)

cardinal tetra

The classic neon tetra (Paracheirodon innesi) is a popular choice for beginning fishkeepers and the species is one of the most well-known among people that don’t have their own aquarium. When it comes to more experienced aquarists, though, that appears to be another story. Neons are so ubiquitous that many move away from them eventually, which is a shame for such a beautiful and well-mannered species!

Neon tetras are easy to care for and will do well in your community aquarium as long as you don’t keep larger fish that might view their smaller tankmates as a tasty snack. Keep a school of at least 6 but ideally 10+ specimens so the fish feel safe and you can enjoy their behavior and colors to the maximum.

Plant the aquarium to provide cover and possibly even consider staining the water using leaf litter to imitate the neon tetra’s natural habitat.

Blackskirt Tetras (Gymnocorymbus ternetzi)

black skirt tetra
Marrabbio2 [CC BY-SA 3.0], from Wikimedia Commons
For those who like tetras but don’t want something too standard there’s the blackskirt tetra (Gymnocorymbus ternetzi). This species sets itself apart with its coin-like body shape and dramatic black anal fin. Quite the eyecatcher if you keep it in a reasonably sized group (ideally 8 or more fish)! Go for an aquarium of at least around 20 gallons long so the group has enough space to move around.

Blackskirt tetras get along well with most other aquarium fish that don’t have long, flowy fins. Many of the fish on this list make good choices, and the species is also often used as an accompanying species for larger cichlids. The presence of a smaller dither fish actually helps the cichlids feel safe, as it’s a sign that the waters are safe.

When it comes to water values and tank décor, blackskirts aren’t too demanding. They do prefer things relatively soft and acidic like the waters they naturally occur in. Plant the aquarium using plenty of tall vegetation and consider floating plants or even staining the water in order to block out some of the light. Do make sure you still leave plenty of swimming room: this species is pretty active.

Bristlenose Plecos (Ancistrus genus)

JanRehschuh [CC BY-SA 3.0 (https://creativecommons.org/licenses/by-sa/3.0)], from Wikimedia Commons
If you’re interested in keeping a common or sailfin Pleco, reconsider. Although these catfish are a fascinating addition to your aquarium, many of the fish labeled as ‘Pleco’ and sold in your local aquarium store will outgrow your aquarium before you know it. Instead, consider the smaller Ancistrus genus, which usually won’t surpass 6” and is therefore a lot more manageable.

Keep bristlenose Plecos in an aquarium of at least 30 gallons. Although these catfish don’t grow very large, they still produce a lot of waste and water quality will quickly deteriorate if you place them in a smaller tank! Tankmates aren’t much of a concern, as the species is quite sturdy and camouflages itself well.

Keep in mind that although they’re often referred to as algae eaters, Ancistrus are actually omnivores. Provide a combination of bottom feeder tablets, fresh vegetables and frozen foods to keep your bristlenose Pleco(s) healthy.

Marbled Hatchetfish (Carnegiella strigata)

marbled hatchetfish
SOK, Sven Kullander [CC BY-SA 4.0], from Wikimedia Commons
The shy marbled hatchetfish (Carnegiella strigata) is one example of a species that won’t hurt a fly. This oddly shaped fish will spend almost all of its life at the water surface, where it would naturally catch small insects while taking advantage of the fact that it can pass for a floating leaf. Fascinating to see and a great option for your peaceful community.

Because marbled hatchetfish really are quite timid, you’ll have to select tankmates that won’t bother it. Keep the hatchets with plenty of their own species to help them feel safe: they’ll love the presence of at least around 10 other hatchetfish and will display much more interesting behavior this way.

Your aquarium should be 20 gallons (long) or up if you’re interested in keeping the marbled hatchetfish. Soft and acidic water works best and since this species inhabits the top water layer, water flow can’t be too strong. Make sure the tank has a well-fitting lid that leaves no open spaces: hatchetfish are extremely notorious jumpers that have developed the ability to ‘fly’ pretty far out of the water in case of danger. Hatchetfish keepers widely report finding their fish dried up on the floor if there aquarium lacks a hood. If it does have one you’ll likely hear a startled hatchetfish hitting the plastic or glass on a regular basis, which thankfully usually doesn’t seem to faze the fish too much.

Zebra Danios (Danio rerio)

zebra danio

The highly active zebra Danio (Danio rerio) has been a staple in the aquarium hobby as long a pretty much anyone can remember. This decoratively striped species is very hardy, making it the perfect fish for beginners and anyone looking for something low-maintenance. Additionally, it’s quite peaceful. Avoid tankmates with long fins but choose freely other than that!

Because zebra Danios do appreciate having plenty of space to move, it’s best to keep them in an aquarium of at least 20 gallons (long). Go for a school of at least 6 fish. Try planting the edges of the tank to provide cover, but do make sure to also leave plenty of open space so the fish can swim around as they naturally would.

Harlequin Rasboras (Trigonostigma heteromorpha)

harlequin rasboras
Juan R. Lascorz [CC BY-SA 3.0 (https://creativecommons.org/licenses/by-sa/3.0), GFDL (http://www.gnu.org/copyleft/fdl.html) or CC BY-SA 3.0 (https://creativecommons.org/licenses/by-sa/3.0)]
Harlequin rasboras (Trigonostigma heteromorpha, also still sometimes Rasbora heteromorpha) are a peaceful favorite for both beginners and more experienced aquarists. You can find this easy species in almost every aquarium store and it makes a great choice for calm community tanks with other friendly species like most of the ones mentioned on this list. Just avoid any fish that might be large enough to eat a rasbora, as they are quite small.

With a maximum size of barely 1.8”, this little schooling fish doesn’t require a large aquarium. A tank of 15 gallons (long) and up should be enough to house a reasonably sized group of around 10 individuals. Our preference will always go out to something larger, though: a group of 20 or more specimens of any aquarium fish in a sizeable tank is very spectacular to see.

The harlequin rasbora’s natural habitat consists of slow moving streams with aquatic plants and stained water. You can imitate this in your aquarium by using plenty of tall vegetation and placing a layer of leaf litter on the bottom of the aquarium. Don’t worry about not being able to see the fish properly. They actually show better colors when the water is darker and plenty of hides are available.

Cherry Barb (Puntius titteya)

cherry barb
Photo by Brian Gratwicke

Barbs in general have gained a bit of a bad reputation because of the behavior of the tiger barb (Puntius tetrazona), a popular aquarium fish due to its striped pattern and hardiness but also a rather notorious fin nipper when kept in groups or aquariums that are too small. Not all barbs are nippy, though. In fact, there are a few species that actually make ideal community fish. The beautifully rosy colored cherry barb (Puntius titteya) is one of them.

Because they can handle a wide range of water values as long as the water is clean and the aquarium is cycled, cherry barbs can be combined with pretty much any other peaceful species. They are shoaling fish, so go for a group of at least 6 individuals to keep them happy.

Like many of the species on this list, the cherry barb naturally inhabits areas with dense vegetation and possibly leaf litter that stains the water a darker color. The water flow in these habitats can range from weak to relatively strong.

Dwarf Gourami (Trichogaster lalius)

gourami

If you’re in need of a peaceful addition to the top water layer of a calm community aquarium, the timid dwarf gourami (Trichogaster lalius) might be a good option. These colorful fish are sometimes avoided by aquarists that think they’re overly territorial, but they actually function quite well in communities as long as tankmates are chosen carefully.

To keep your dwarf gourami happy and healthy, the most important factor is a calm environment. That means avoiding strong water flow, dimming the tank lights using floating plants and absolutely no overly assertive neighbors. Colorful and boisterous fish are not a good choice. Instead, go for small schooling species like the harlequin rasbora or bottom feeders like kuhli loaches (both species are discussed in this article).

Dwarf Pencilfish (Nannostomus marginatus)

pencilfish
D.W. [CC0], from Wikimedia Commons
Naturally found in South America, the dwarf pencilfish (Nannostomus marginatus) isn’t one of the most popular aquarium fish. Pencilfish in general aren’t kept as other schooling fish like livebearer or tetras, which is a pity since they make a great addition to community aquariums.

Dwarf pencilfish live up to their name with a maximum size of only around 1”. This means you won’t need a large aquarium if you’d like to keep a group of these striped fish: a 15 gallon long tank should be plenty to sustain 8-12 specimens. Go for calm tankmates that don’t have an appetite for small fish, as this species doesn’t like being surrounded by very active or assertive neighbors.

The natural habitat of the dwarf pencilfish often consists of very shallow and calm waters with low acidity/hardness, lots of leaf litter and low flow rate. This means this fish won’t do well in bare tanks or hillstream-type set-ups. Instead, you should aim to make the aquarium as peaceful and well-planted as possible, ideally with a thick layer of leaves on the substrate to darken the water and floating plants to block out excess light.

Guppies (Poecilia reticulata)

guppies

Even the majority of non-aquarists have heard of the ever-popular guppy (Poecilia reticulata) at some point. This livebearer is appreciated in the hobby for many of its characteristics: beautiful and varied coloration, long and flowy fins, easy care and even easier breeding. To top it all off, these fish are also peaceful and community-proof.

Guppies are best kept in an aquarium of 15 gallons (long) or up. Although the species is not too demanding when it comes to water values, it does best when the water is on the hard and alkaline side.

If you’re setting up an aquarium with guppies, don’t forget what we said about ease of breeding. This species is extremely proliferous and can easily produce enough fry to completely overrun your tank. If you don’t have the means to house this many guppies, consider getting only males to avoid this problem.

Glowlight Tetra (Hemigrammus erythrozonus)

glowlight
gonzalovalenzuela [CC BY 2.0], via Wikimedia Commons
Like the previously mentioned neon tetra, the glowlight tetra (Hemigrammus erythrozonus) is a small, colorful and peaceful tetra species. It makes a good choice for beginners since it isn’t too demanding when it comes to water values and can easily be combined with many other species of peaceful aquarium fish.

Like other tetras, the glowlight tetra is a schooling species that should be kept with as many of its own species as possible. 8-10 fish would be good to start, but more is better! Go for a long aquarium of at least 20 gallons so the tetras have space to swim. Tankmates aren’t much of a concern, although you should keep in mind that this species is a little too small to combine with larger cichlids like discus fish.

Glowlight tetras naturally occur in a single river that features very acidic black water. It’ll do best in similar conditions in the aquarium and won’t show its best colors in light or bare surroundings. A South American biotope set-up would be ideal for this species and will allow you to really see its true colors and behavior.

Platies (Xiphophorus genus)

platy fish

Like guppies, platies from the genus Xiphophorus are livebearers that have been selectively bred for coloration. Although they surpass their guppy cousins in size, you’ll find they’re relatively similar when it comes to everything else. This species is undemanding, proliferous, peaceful and loved for its looks.

Keep platies in an aquarium or at least 15 gallons, ideally 20 and up. Keep the water on the harder and alkaline side and go for tankmates that appreciate similar conditions. If you’d like as much fry as possible to survive, add plenty of floating stem plants to the tank to function as both cover and foraging grounds.

Love platies? You might also like the almost identical swordtail (Xiphophorus hellerii), that is named after the enlarged bottom tail fin seen on the males. A very decorative fish that can be combined with other livebearers to make for an active and colorful tank.

Sparkling Gourami (Trichopsis pumila)

sparkling gourami
BEDO (Thailand) [CC BY-SA 4.0], from Wikimedia Commons
One of the most fascinating species on this list (in our humble opinion) is the tiny sparkling gourami. Unlike other gourami, this fish doesn’t grow larger than around 1.7”, making it a true nano fish that can be kept in smaller aquariums. Just 10 gallons should be enough to house a pair or small harem of sparkling gourami.

If you’d like to keep sparkling gourami in your aquarium, make sure to heavily plant things and provide ample cover. Coconut caves, upside-down terracotta pots, long-rooted floating plants: the gourami will appreciate any spots they can dart to when startled. Keep in mind that gourami are labyrinth fish, which means they have evolved to breathe air. They need access to the surface and don’t like being swept away by strong currents, as their natural habitats are very calm.

Keep your sparkling gourami in soft and acidic water with other small and peaceful species like mosquito rasbora or kuhli loaches (both discussed below). Larger and more active fish can stress this small gourami out.

Mosquito Rasbora (Boraras brigittae)

mesquite rasbora
LeokaHU [CC BY-SA 3.0], via Wikimedia Commons
It doesn’t get much smaller than this: the tiny mosquito rasbora (Boraras brigittae) rarely reaches an inch in size. Despite this, these rasboras are a real eyecatcher in your aquarium and definitely a species to consider if you’re setting up a peaceful community, especially with other Indonesian species. Their red coloration and fascinating territorial squabbles make them a joy to watch.

You can keep mosquito rasboras in long aquariums of 10 gallons and up, although we like to shoot for at least 15 so we can keep larger groups and introduce some tankmates. Obviously your choices when it comes to fish to keep with these rasboras aren’t unlimited: they’re so small and vulnerable you should really take care to avoid anything that might be able to eat them. They do work well with other small schooling fish, Corydoras or timid labyrinth fish like the previously mentioned sparkling gourami.

The Southeast Asian streams and ponds these rasboras inhabit are characteristically very calm and stained a dark brown from leaf litter and branches. Go for something similar in the aquarium if you want to keep this species happy and healthy. Feed a combination of dried foods and, ideally, home-bred live foods like daphnia. You’ll love seeing these little fish hunt!

Glass Catfish (Kryptopterus vitreolus)

Glass Catfish
Vassil [CC0], from Wikimedia Commons
There are multiple catfish species from the Kryptopterus genus available in the aquarium trade that are referred to as glass (or ghost) catfish. For those looking for a peaceful and calm addition to their aquarium we prefer Kryptopterus vitreolus, a smaller variety that does well in calm communities.

Despite the fact that it’s the smaller Kryptopterus variety, this glass catfish can still reach a size of 2.6” inch or even a little more. Since it should also be kept in groups of at least 6 or more individuals, it’s not a good idea to keep it in a small aquarium. Instead, go for a tank of at least 30 gallons in order to make sure the fish have enough room to move.

This glass catfish is naturally found in Southeast Asia, specifically Thailand. Here, it inhabits waters with very little movement and dark water of low acidity and hardness. This means it won’t appreciate strong flow or lighting in the aquarium. It should also be noted that this species can be a little fragile, meaning it might not be the ideal choice for beginners. The aquarium should also be fully cycled and you should make it a point to keep up with your water changes to keep glass catfish successfully.

Mollies (Poecilia sphenops)

mollies

Another livebearer makes the list! Not surprising, as most species are peaceful, hardy and popular additions to the aquarium. Molly fish (Poecilia sphenops) are no exception. They have been selectively bred into different colors and body shapes, meaning you can have plenty of variation within a single school. There’s the classic black molly, but you’ll also find white, dalmatian, orange and “sunburst” (with a dash of orange) mollies in your local aquarium store.

Mollies combine well with pretty much any fish that thrives equally in harder and more basic water, including the other livebearers on this list. Do keep in mind that they’re a little larger than guppies and platies (reaching a maximum size of around 4.5”), which means you’ll need to house them in a long aquarium of at least 30 gallons in order to provide them with the swimming space they need.

Mollies (as well as guppies, platies and swordtails) have a very high salt tolerance as they naturally inhabit habitats with varying degrees of salinity. This means they actually make a great choice if you’re looking for a peaceful addition to a brackish community aquarium. In fact, you can keep them in salinities up to full marine!

Kuhli Loach (Pangio kuhlii)

Kuhli Loach
Photo by AJC1

Although they may not be 100% safe for baby shrimp, kuhli loach (Pangio kuhlii) can be combined with pretty much anything else you can think of (as long as it’s not highly carnivorous). This peaceful species is a bottom feeding loach that spends almost all of its life in the lowest water layer, foraging for leftovers and wedged in tight crevices between décor.

Kuhli loaches aren’t too demanding when it comes to aquarium set-up, although they do need clean water to thrive. Set up your tank using a sandy substrate to allow the loaches to burrow and provide hides in the form of tubes and coconut caves.

No idea where your kuhli loaches are? These fish are well-known for being able to stay out of your sight for weeks. The trick here is to understand that this species is actually nocturnal, meaning it becomes active at night. Try installing a moonlight that turns on for a while after the regular tank lights are off if you’d like to see these fish in action.

Threadfin Rainbowfish (Iriatherina werneri)

Although this list is full of brightly colored and very decorative fish, the cheerful threadfin rainbowfish (Iriatherina werneri) might just take the cake. In addition to being beautifully colored, the males of this species feature dramatic finnage used to impress females during spawning time.

Considerably smaller than most rainbowfish, the threadfin can be kept in aquariums of 15 gallons and up. Do make sure you go for a long tank rather than a tall one in order to provide the swimming room this schooling fish needs. Choose peaceful tankmates that won’t nip at the males’ showy fins and aren’t too boisterous, like the marbled hatchetfish mentioned earlier.

The aquarium should be densely planted if you really want to see this species at its best. It’s naturally found in calm habitats with very abundant vegetation, so try to replicate this as best as possible in the aquarium. Water acidity and hardness isn’t too much of an issue, but as always the tank should be clean and fully cycled.

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