Tag: Freshwater Fish Profiles

Rummy Nose Tetra: Complete Care Guide (And Why Their Color Tells You Everything)

The rummy nose tetra is a living water quality meter. Bright red nose means your tank is dialed in. Pale nose means something is wrong. There is no fish in the hobby that gives you faster, more honest feedback about your water conditions.

The rummy nose tetra does not lie. Its nose tells you exactly how good or bad your water is.

What Most Care Guides Get Wrong About Rummy Nose Tetra

The most common mistake I see with rummy nose tetras 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. Rummy Nose Tetras 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, rummy nose tetras are adaptable. But “adaptable” doesn’t mean they’ll thrive in just anything. In my experience, keeping them closer to their natural soft, slightly acidic conditions brings out the best color and longevity.

The Reality of Keeping Rummy Nose Tetra

The red nose tells you everything. A vibrant crimson nose means your water is clean, your parameters are stable, and the fish is healthy. A faded, pale nose means something is wrong. PH swing, ammonia spike, stress from aggressive tank mates, temperature fluctuation. This is the most honest fish in the hobby because it cannot hide how it feels.

They need more space than most tetras. Rummy nose tetras are active swimmers that need room to school properly. A 20-gallon is the absolute floor for a small group, but 30 gallons or more is where you see the real schooling behavior. In cramped tanks they cluster in a corner and the schooling breaks down.

Acclimation is critical. Rummy nose tetras are more sensitive during the first 48 hours after purchase than almost any other common tetra. Drip acclimate them slowly. Many losses happen because keepers rush the acclimation process.

Biggest Mistake New Owners Make

Adding them to a new or unstable tank. They are not a cycling fish. They need mature, dialed-in water from day one. The red nose disappears within hours of a parameter swing, and if it stays faded, the fish is stressed and heading toward trouble.

Species Overview

Scientific Name	Hemigrammus bleheri (also referred to as H. Rhodostomus)
Common Names	Firehead Tetra, Red Nose Tetra, and Brilliant Rummy Nose Tetra
Family	Characidae
Origin	South America
Diet	Omnivore
Care Requirements	Easy
Activity	Active
Lifespan	5. 6 years
Temperament	Peaceful
Tank Level	Top and middle level
Minimum Tank Size	10 gallons
Water Temperature Range	75° – 85° F
Water Hardness	2. 6 dKH
pH Range	6.2 – 7.0 (slightly acidic)
Filtration/Water Flow	Slow to Moderate
Water Type	Freshwater
Breeding	Egg Layer
Difficulty to Breed	Challenging in captivity
Compatibility	Community tanks
OK, for Planted Tanks?	Yes

Classification

Kingdom	Animalia
Phylum	Chordata
Class	Actinopterygii
Order	Characiformes
Family	Characidae
Genus	Hemigrammus
Species	H. Rhodostomus (Ahl, 1924)

ASD Difficulty Rating: Intermediate | 6/10
Rummy nose tetras are water quality indicators. They need a mature, stable tank and pristine parameters. They are not a beginner fish. They are a reward for a well-established setup.

What Are Rummy Nose Tetras?

Rummy nose tetras are popular freshwater fish species, originating from South America. They are particularly found in Rio Negro in Brazil and Rio Vaupes in Columbia. These freshwater aquatic species go by many names, including Fire head tetra, Red nose tetra, and Brilliant rummy nose. They are peaceful fish that are active and playful with their computable tank mates. Hence, make the best aquarium species in the community tank.

Origin and Habitat

In the wild, rummy nose tetras live in the tropical and subtropical regions of South America, especially in the rainforest rivers and streams, such as Rio Negro and Rio Meta river basins or Petitella Georgia from the Upper Amazon basin in Peru, Rio Purus, Rio Negro, and Rio Madeira river basins.

However, nowadays, most rummy nose tetras are captive-bred. The captive-bred species are farmed in South East Asia and Europe and sourced throughout the globe successfully.

Appearance

The startling difference between other freshwater fish and Rummy nose tetras is their red head that leaves your visitors awestruck.

The body of rummy nose tetras is torpedo-shaped with sheer silver color accentuated with a grayish-green hue. The caudal fin in rummy nose tetra is patterned with black and white horizontal stripes with colorless lobe tips. There is a very thin, indistinguishable black line that runs forward base to base- from the caudal fin towards the dorsal fin.

The deep fiery color in the rummy nose tetra is limited to the head region only, and the vibrancy of colors on your rummy nose tetras speaks volumes of the tank’s water quality, diet, and overall health of the fish.

Types

Rummy nose tetras are divided into three distinct very similar tetra species.

The True Species: Hemigrammus rhodostomus

The Hemigrammus Rhodostomus are the true rummy nose tetras that are often sold as the common rummy nose tetra or the “brilliant nose tetra”. However, you can easily distinguish the following by these factors:

The amount of red coloration on the head is a little lighter than H. Bleheri.
The dark blotch is absent at the bottom.
The line that extends laterally from the central caudal fin is narrower in the true rummy nose tetra.

The Brilliant or The Common: Hemigrammus bleheri

The most popular species of the rummy nose tetra are H. Bleheri. Commercial breeders also produce a golden variant of the rummy nose tetra by selectively breeding, which is available for sale from time to time.

The red coloration on the fish’s head extends into the fish’s body, beyond the gill covers.
The presence of a dark blotch at the top of the caudal peduncle.
The line that extends laterally from the central fin into the fish’s body is almost invisible.

The false Kind Petitella georgiae

The false rummy nose tetras is distinguished by the other two types on the basis of:

Bright redhead
The black horizontal line extends to the middle rays of the caudal peduncle.
Presence of diagonal black bars in each caudal-fin lobe, divided by white bands

Therefore, this species of rummy nose tetra is often labeled as the black-finned rummy nose.

Average Size and Lifespan

Rummy nose tetras are small freshwater fish. They grow no longer than two inches in length with a life expectancy of around six years with proper maintenance and care.

Care Guide

Rummy noses are popular schooling fish that are considered easy for beginners. However, if you don’t take care of them or maintain their water quality, things can get worse. Therefore, be vigilant in raising a rummy nose, because they take poor water conditions and other parameters very seriously.

Also, rummy noses are much appreciated by the aquarium keepers as they are very active and very reasonable in many pet stores.

The Rummy Nose Tetra is a hardy fish when well taken care of that will live for almost a decade ranging from five to eight years. These tiny fish grow up to anywhere from one and a half inches to two and a half inches.

What People Get Wrong

The biggest mistake is buying rummy nose tetras for a new tank. They look beautiful in the fish store and beginners pick them up without realizing how sensitive they are to water quality. Any ammonia or nitrite in the water will stress them immediately. Pale nose coloration is the first sign, death follows quickly.

The red nose is a real-time health indicator. Full bright red from snout to gill plate means the fish is healthy and the water is clean. A pale or pink nose means stress, poor parameters, or disease. This is actually one of the most useful diagnostic tools in the hobby: if your rummy noses pale out, test your water immediately.

Second mistake: keeping them in groups too small. Under 8, rummy nose tetras school loosely and nervously. A school of 12 to 20 in a planted tank produces the synchronized, tight schooling behavior that makes this fish so visually impressive. Small groups just hide.

Aquarium Setup

In their natural habitat, the rummy nose tetra occupies the middle and top water column with a preference for slow-moving waters. However, they have usually seen feeding and swimming in the middle and bottom as well.

Rummy nose tetras stay happy in a spacious tank where they could swim freely with lots of hiding places and plants.

Tank Size

While they can qualify for a nano tank given their size, they are not the best nano fish. The minimum tank size for rummy noses should be no less than 20 gallons. It is observed that these fish occupies the middle and top levels of the tank, but oftentimes they is seen swimming and feeding in the middle and bottom levels. In captivity, experts suggest keeping them in schools of six or more. These fish species are particularly small, which means around five of these fish easily fit in ten gallons, meaning you can fit 25 rummy noses in a 30-gallon tank.

Water Parameters

Rummy nose tetras admire warm water temperature so much. So, they should always be kept in water temperatures around 75 to 85 degrees Fahrenheit – with 78 being the most ideal temperature Also, they prefer slightly acidic to neutral water with recommended pH levels of 6.2 to 7. Any changes in the water chemistry of the tetra tank and temperature would adversely affect these tetras. Therefore, be sure to maintain optimal conditions to raise a happy and healthy tetra.

Hard Rule: Do not add rummy nose tetras to a tank that has been running for less than 3 months. Their signature red nose fades (or they die outright) in a tank with any ammonia or nitrite. They are not a cycling fish. They are a reward fish for a stable, established tank.

Filtration and Aeration

Rummy noses take their tank condition very seriously. The slightest inconvenience, for example, the traces of ammonia, nitrite, nitrates, and other toxins can shorten their lifespan and activity levels. Therefore, to provide a healthy ecosystem, it is suggested to use a robust filter such as HOB or canister filters to keep your fish tank free of toxins.

For larger aquariums of around 40 gallons or more, I suggest using airstones to increase aeration and water oxygenation, or you can install multiple filters

Lighting

Like most fish, rummy nose tetras do not enjoy bright lights. Therefore, if you have a well-planted tank, I suggest using dim light or adjustable L.E.D lights to subtly light your aquarium for plant material.

To darken the tank more, you can get tall floating plants and driftwood and rocks, providing cozy, shady areas for your fish.

Aquatic Plants and Decorations

The number one rule to keep your tetras happy as a daisy is to mimic their natural habitat and see them thriving more than ever.

Since these fish species are top- to middle-dwelling, I recommend you get plants that reach such water columns to provide a sense of protection. Also, rummy tetras loathe bright lights. So, to give them ample shade, add floating plants and rooted plants for them to hide and burrow for shade if needed. You can add as much plant material as you want because rummy tetras are not destructive toward aquatic plants.

For tank decorations, a piece of driftwood and a pile of rocks provide much space to hide and rest. But be sure to not overwhelm the tank with plants and other decorations because rummy noses enjoy a lot of swimming room. Low light plants are recommended for these types of tetras.

Substrate

Many tetra keepers use a dark substrate to make their radiant rummy noses and out from the crowd. But you can use any high-quality fine sandy substrate or pebble substrate at the bottom of your tank.

Tank Maintenance

No matter how many high-quality filters you use, rummy noses are very sensitive to toxins and poor water conditions. Therefore, you should to do weekly water changes without stressing them much. Also, it is advised to change your filter media every 3 weeks. If you’re planning to breed rummy nose tetra, make sure to test the water quality daily as mild exposure to minerals such as Calcium and other toxins can cause sterility in these tetras.

Community Tank Mates

The good news is rummy noses are a schooling and peaceful fish. Thus, they will mix with other schooling fish, just make sure you have at least 6 to form a group.

The most suitable tank mates in a rummy nose tetra tank are:

Danios of all types
Corydoras Catfish
Barbs
Harlequin Rasboras
Lemon Tetras
Black widow tetras
Cardinal tetras
Peppered catfish
Siamese fighting fish

And all other peaceful, small fish. Mostly dwarf shrimps go well with rummy nose tetras. However, the adult fish might end up eating dwarf shrimp and their fry. Therefore, always opt for tank mates equal to the size of the rummy nose tetra.

Incompatible Tank Mates

The incompatible tank mates are most of the cichlids and other large or aggressive fish that may bully or harm your rummy noses.

Breeding

Breeding rummy nose tetras is a challenging task, especially in captivity because a minor increase in the calcium levels causes sterility in these fish.

To breed rummy noses successfully, you need to provide them with soft water with a pH of around 6.5. Also, the levels of Calcium should be close to none in the breeding tank and the temperature range should be around 84 degrees Fahrenheit with low lighting.

Rummy noses are egg layers and they lay their eggs on the fine-leaved plants such as java moss. These fish lay only a few eggs at one time, that too, at night time. I suggest removing the parents into another tank because they may eat eggs.

After three to four days, the eggs hatch, which are vulnerable to fungus. You can use an anti-fungal medication to avoid this problem. If the medication is not available, you can use natural items like Indian Almond Leaves as their tannic acid is helpful in preventing fungal infections. Check out this video by Bo The Tetra Breeder below for a timelapse of the fry’s development.

How do you raise the Fry?

The baby rummy noses are slow growers among all the popular freshwater fish. Many fish experts make them eat infusoria for at least three weeks before feeding them anything else. The fish fry is very vulnerable to fatal diseases, thus, the quality of tank water should be maintained properly.

It takes around six months for the rummy nose’s baby to munch on adult fish food such as Daphnia.

Food and Diet

Since these fish are omnivorous. They thrive well on a varied diet rich in protein. You can easily feed them premium-quality flake food, pellets, frozen foods, freeze-dried foods, bloodworms, blackworms, and much more.

In the wild, they munch on plant debris and insect larvae. But in captivity, they have a variety of food to feed on such as brine shrimp, fish eggs, green vegetables including, cabbage, lettuce, cucumber, etc, and commercial food as well.

However, don’t forget to add flake food as the base because good flake food will provide nutrients and are easy to feed for these small fish.

How Often Should You Feed Rummy nose?

You can feed these species twice daily. But make sure they finish the food within 2 minutes to prevent food decay and a murky tank.

Rummy noses are sensitive to nutritional deficiencies. Therefore, feeding them with high-quality flake food with lots of protein content is crucial along with occasional treats given on a weekly basis.

Common Health Problems and Diseases

The best part about rummy noses is they hardly get sick and catch diseases if you provide them with excellent water conditions.

However, there are some common health problems and diseases observed in the rummy noses such as:

Dropsy

In this condition, the fluid builds up inside the body of a fish. This is due to bacterial infections, liver dysfunction, or parasitic infections. Either way, proper diagnosis is recommended.

Ich or White spot Disease

The Ich disease is a common health problem in most tropical fish. The signs of these diseases are the presence of small white spots on the body and gills, scraping of the body against sharp, hard objects in the aquarium, loss of appetite, and abnormal hiding or lethargic behavior.

Differences Between Male and Female

The visual differences between the male and female rummy nose species are close to none. However, when the female is full of eggs, the body looks fuller and much more rounder than the male.

Where to get the best quality from?

Since you’ve researched everything about the rummy nose tetras, it’s time to get your hands on this great fish.

You can easily purchase these beautiful fish from online fish stores or in-store from the local breeders. Either way, the cost of rummy nose tetra is very as affordable as low $4 for a single fish, and $25 for a group of six to keep in your home aquarium.

Where to Buy

These tetra fish are easy to find at fish stores. While easy to find, not every fish store is reputable. If you want to go with an online option, I would highly recommend Flip Aquatics. Rob and his team value the care they put into their aquatic animals. It is in my mind, the best place to purchase nano fish and shrimp from. You can use promo code ASDFLIPPROMO at check out for a discount!

Rummy Nose Tetra

An easy to care for Tetra fish that loves to school. Very peaceful fish that are great for beginners

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FAQs

Is the Rummy Nose Tetra Right for You?

Before you add a rummy nose tetra 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. Rummy Nose Tetras 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 rummy nose tetra 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.

Avoid If:

Your tank is not fully cycled and stable – rummy nose tetras are the hobby’s benchmark for water quality; any ammonia spike shows as immediate color loss
You cannot maintain 75–80°F (24–27°C) consistently – they are strictly tropical and show stress with every temperature fluctuation
You keep a school under 8 – small groups lose the tight synchronized schooling that defines this species’ visual appeal

What It Is Actually Like Living With Rummy Nose Tetra

Watching a healthy school of rummy nose tetras is genuinely mesmerizing. They move as a single unit, changing direction simultaneously like they share one brain. No other tetra does this consistently.

They are creatures of routine. They school in the same patterns, occupy the same areas, and react to feeding time with choreographed precision.

The red nose is addictive to monitor. You will find yourself glancing at the tank throughout the day just to check the color intensity. It becomes your instant read on tank health.

They pair beautifully with calm, well-planted setups. Heavy plant cover along the back with open swimming space in front gives them room to school while feeling secure.

How the Rummy Nose Tetra Compares to Similar Species

Choosing between similar species is tricky. Here’s how the rummy nose tetra stacks up against some common alternatives.

Rummy Nose Tetra vs. False Rummy Nose Tetra: Both species occupy a similar niche in community tanks, but they differ in temperament, coloration, and ideal water conditions. The rummy nose tetra is a solid choice for hobbyists who want reliable schooling behavior and easy care, while the false rummy nose 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 False Rummy Nose Tetra care guide for a detailed breakdown.

Rummy Nose Tetra vs. Cardinal Tetra: Both species occupy a similar niche in community tanks, but they differ in temperament, coloration, and ideal water conditions. The rummy nose tetra is a solid choice for hobbyists who want reliable schooling behavior and easy care, while the cardinal 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 Cardinal Tetra care guide for a detailed breakdown.

Expert Take (Mark Valderrama, AquariumStoreDepot)
Rummy nose tetras are one of my favorite fish for a mature, planted community setup. When conditions are right, they school tight and move in unison in a way that almost no other tetra replicates. But they are not a beginner fish. They need pristine water and a fully cycled, established tank. Treat them like a canary: if the red nose fades or the coloration goes mottled, something is wrong with your water.

Final Thoughts

The rummy nose tetra is a beautiful addition to your community aquarium. The most crucial part of raising a happy and healthy rummy nose tetra is to provide them with ample free swimming space and a well-balanced, nutritious diet. Besides, they are a very hardy fish with a lifespan of around six years, if taken good care of.

12 Easiest Fish to Take Care Of: My Top Picks for Beginners After 25 Years

After 25 years in the hobby and time managing fish stores, I’ve introduced a lot of people to fishkeeping. The fish you start with matters more than most people realize. Choose wrong and you’ll have a crash in the first month and walk away. Choose right and you’ll still be in this hobby a decade later. “Easy” doesn’t mean zero maintenance or any tank size. It means a fish that can absorb beginner mistakes: the temperature swing, the delayed water change, the tank that isn’t fully cycled yet. These 12 fish are the ones I’d actually put in front of someone starting out, ranked by how forgiving they are when things aren’t perfect.

You still need to cycle the tank. Easy fish forgive mistakes. They don’t survive neglect.

Key Takeaways

“Easy” means forgiving. It does not mean indestructible or no-maintenance.
Every tank needs to be cycled before adding fish. This is not optional regardless of how hardy the fish is.
The fish most often marketed as “beginner” (goldfish, cichlids) are actually intermediate-to-advanced. Avoid them until you have a working tank.
School fish (tetras, danios, rasboras) need to be kept in groups of at least 6. A school of 2 is not a school. It’s two stressed fish.
Bettas are genuinely easy in their own tank. They are not easy in a community tank with fin-nippers or other bettas.
The bristlenose pleco is the best algae eater for a beginner tank. It stays small and is far more manageable than common plecos.

Expert Take | Mark Valderrama, AquariumStoreDepot

After 25 years in this hobby, the fish I’d put in front of any new keeper first is the zebra danio. Nearly indestructible, active enough to keep you interested, peaceful, easy to feed. If you can keep danios alive and healthy for 60 days, you have enough experience to add more sensitive fish. If you want something flashier to start, bettas in their own 5-gallon (19 L) setup are the second recommendation. The key thing beginners almost always miss: the fish aren’t the problem. The tank setup and the cycle are. Get those right and most fish on this list will take care of themselves.

ASD Difficulty Rating: Quick Reference Guide

This guide covers the hardiest, most beginner-friendly freshwater fish. Species that forgive beginner mistakes while rewarding proper care. Use it to build a tank that succeeds from the start.

ASD Beginner Fish Tiers

Most Forgiving (start here): Zebra danios, white cloud minnows, bettas (solo tank), endler’s livebearers

Very Hardy (great first community fish): Cherry barbs, harlequin rasboras, kuhli loaches, corydoras, cherry shrimp

Hardy but with one important caveat: Bristlenose pleco (needs wood), siamese algae eater (grows large), red-eye tetra (needs school of 6+), black neon tetra (needs school of 6+)

12 Easiest Fish to Take Care Of

Each species profile includes the key stats you need: scientific name, temperament, origin, size, minimum tank size, diet, pH, temperature, and difficulty to breed.

1. Betta Fish

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Scientific name: Betta splendens
Temperament: Aggressive toward other bettas and fin-nippers
Origin: Southeast Asia
Size: 2.5 inches (6.4 cm)
Minimum Tank Size: 5 gallons (19 L)
Diet: Pellets, flakes, brine shrimp, bloodworms
pH: 6.5-7.5
Temperature: 75-82°F (24-28°C)
Difficulty to breed: Moderate

The betta fish gets labeled as easy because it can survive in smaller spaces than most tropical fish, but “survive” and “thrive” are different things. In a properly set up 5-gallon (19 L) tank with a heater, a sponge filter, and regular water changes, bettas are genuinely low-maintenance and visually spectacular. In a bowl with no filter and no heat? They’ll fade, fin-rot, and die. The setup matters more than the fish’s hardiness.

Keep one betta per tank. Males will fight, fins will be destroyed, and one fish will die. That’s not a maybe.

2. White Cloud Minnows

White Cloud Mountain Minnow

A very peaceful fish that does well in cold-water tanks. Other minnow varieties also available.

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Scientific name: Tanichthys albonubes
Temperament: Peaceful
Origin: China
Size: 1.5 inches (3.8 cm)
Minimum Tank Size: 10 gallons (38 L)
Diet: Granules, pellets, flakes
pH: 6.0-8.5
Temperature: 58-72°F (14-22°C)
Difficulty to breed: Moderate

White cloud minnows are cold-water fish that don’t require a heater in most homes. That removes one of the most common beginner failure points: heater malfunction or temperature swings. They’re peaceful, colorful, and completely manageable. They prefer cooler water than most tropical fish, so don’t mix them with species that need 78-82°F (26-28°C). Keep them in a school of 6 or more for the best display.

3. Danios

Scientific name: Danio rerio and related species
Temperament: Peaceful
Origin: South and Southeast Asia
Size: 1.5-2 inches (3.8-5 cm) for zebra danios; up to 4 inches (10 cm) for giant danios
Minimum Tank Size: 10-20 gallons (38-76 L)
Diet: Pellets, granules, flakes, live/frozen foods
pH: 6.0-8.0
Temperature: 65-77°F (18-25°C)
Difficulty to breed: Moderate

If I had to pick one fish for a beginner, it would be the zebra danio. They’re active, they school, they’re nearly indestructible, and they signal clearly when something is wrong in the tank because sick danios are obvious. They’re also fast enough to avoid most fin-nippers, which makes them compatible with a wide range of tank mates. Keep a school of 8 or more.

4. Endler’s Livebearer

Endler’s Livebearers

A very active and colorful livebearer. Smaller in size than guppies.

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Scientific name: Poecilia wingei
Temperament: Peaceful
Origin: Venezuela
Size: 1.5 inches (3.8 cm)
Minimum Tank Size: 10 gallons (38 L)
Diet: Granules, pellets, flakes
pH: 7.0-8.5
Temperature: 75-86°F (24-30°C)
Difficulty to breed: Easy

Endler’s livebearers are smaller than guppies, more colorful than most nano fish, and one of the easiest fish to breed in the hobby. If you want to control population: keep only males, or only females. A mixed tank will have fry regularly. That’s either a feature or a problem depending on your setup.

5. Kuhli Loach

Kuhli Loach

Kuhli loaches are hardy bottom-dwelling fish. Nocturnal in nature. Gets along with many fish and tolerant of a range of temperatures.

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Scientific name: Pangio semicincta
Temperament: Peaceful
Origin: Southeast Asia
Size: 3.5-4 inches (9-10 cm)
Minimum Tank Size: 15 gallons (57 L)
Diet: Sinking tablets, frozen foods
pH: 3.5-7.0
Temperature: 70-79°F (21-26°C)
Difficulty to breed: Advanced

Kuhli loaches are nocturnal, which means you won’t see them much during the day. They’re shy, they hide, and they emerge at feeding time and after lights out. Don’t get them as your only species if constant visibility is the goal. In a community tank where the bottom needs a cleaner and a conversation piece, they’re excellent. Keep 3 or more: solo kuhli loaches barely move. In a group, they become noticeably more active.

6. Bristlenose Pleco

Bristlenose Pleco

The Bristlenose Pleco is a smaller pleco that does a great job eating algae. Peaceful and gets along with most fish.

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Scientific name: Ancistrus spp.
Temperament: Peaceful
Origin: South America
Size: 5 inches (13 cm)
Minimum Tank Size: 30 gallons (114 L)
Diet: Algae wafers, sinking tablets, fresh vegetables, driftwood
pH: 6.5-7.4
Temperature: 70-78°F (21-26°C)
Difficulty to breed: Moderate

The bristlenose pleco is the pleco to get for a beginner tank. Common plecos grow to 12-18 inches (30-46 cm) and will outgrow most home aquariums within 2 years. Bristlenoses stay at 5 inches (13 cm) and are legitimate algae eaters that will visibly clean the glass and decorations. They need driftwood in the tank: wood is a dietary component, not just decoration. Without it, their health declines. Provide it and they’ll do their job for years.

7. Harlequin Rasbora

Harlequin Rasbora

A peaceful schooling fish. An ideal community fish and a great beginner choice.

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Scientific name: Trigonostigma heteromorpha
Temperament: Peaceful
Origin: Southeast Asia
Size: 1.25-1.75 inches (3.2-4.4 cm)
Minimum Tank Size: 15 gallons (57 L)
Diet: Granules, flakes, frozen/live foods
pH: 5.0-7.5
Temperature: 70-82°F (21-28°C)
Difficulty to breed: Moderate

Harlequin rasboras are one of the most reliable community fish I know of. They’re peaceful, they school tightly, they accept a wide pH range, and they have that distinctive black triangle marking that makes them genuinely attractive. They love planted tanks. Keep 8 or more and they’ll be one of the best visual elements in the aquarium.

8. Corydoras Catfish

Scientific name: Corydoras spp.
Temperament: Peaceful
Origin: South America
Size: 2-3 inches (5-7.5 cm)
Minimum Tank Size: 15-20 gallons (57-76 L)
Diet: Sinking pellets, tablets, frozen/live foods
pH: 7.0-8.0
Temperature: 74-80°F (23-27°C)
Difficulty to breed: Advanced

Corydoras are one of the few fish that breathe atmospheric air as a supplement, so you’ll regularly see them dart to the surface and dart back down. It’s a normal behavior, not a sign of distress, as long as it’s not constant. They’re peaceful, they clean up the bottom, they get along with nearly everything, and they’re entertaining to watch in groups. Keep 4 or more of the same species. Mixed cory species rarely school together effectively.

9. Cherry Barbs

Cherry Barb

A popular freshwater fish from the barb family. One of the most peaceful barb species.

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Scientific name: Puntius titteya
Temperament: Peaceful
Origin: Sri Lanka
Size: 1.5-2 inches (3.8-5 cm)
Minimum Tank Size: 15 gallons (57 L)
Diet: Granules, pellets, flakes, some plant matter, live/frozen foods
pH: 6.0-8.0
Temperature: 68-81°F (20-27°C)
Difficulty to breed: Moderate

Cherry barbs don’t have the fin-nipping reputation of tiger barbs, which makes them a good choice for community tanks with delicate fish. Males are a deep red, females a pale bronze. Keep a higher ratio of females to males to avoid males stressing each other out competing for mates. A school of 8 with 2-3 males and 5-6 females is the ideal setup.

10. Red-Eye Tetra

Scientific name: Moenkhausia sanctaefilomenae
Temperament: Peaceful
Origin: South America
Size: 2.8 inches (7 cm)
Minimum Tank Size: 20 gallons (76 L)
Diet: Granules, pellets, flakes, plant matter, live/frozen foods
pH: 6.0-8.0
Temperature: 72-79°F (22-26°C)
Difficulty to breed: Moderate

The red-eye tetra is underrated. It grows a bit larger than neon or cardinal tetras, which makes it more visible and more compatible with a wider range of tank mates. It’s hardy across a wide pH range and temperature range, eats anything, and is peaceful enough for most community setups. Keep in schools of at least 6.

11. Siamese Algae Eater

Siamese Algae Eater

A great algae-eating fish known for eating black beard algae. Grows up to 6 inches (15 cm) and requires a larger aquarium.

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Scientific name: Crossocheilus oblongus
Temperament: Peaceful
Origin: Southeast Asia
Size: 6 inches (15 cm)
Minimum Tank Size: 20 gallons (76 L)
Diet: Algae, plant matter
pH: 6.5-8.0
Temperature: 75-79°F (24-26°C)
Difficulty to breed: Advanced

Siamese algae eaters are one of the few fish that actually eat black beard algae. That makes them useful in ways most algae eaters aren’t. They’re peaceful, adaptable, and not particularly demanding. The caveat is size: at 6 inches (15 cm) they outgrow small community tanks. Plan for a 30-gallon (114 L) or larger if you want to keep them long-term.

12. Black Neon Tetra

Black Neon Tetra

A hardy neon-style tetra. More resilient than neon and cardinal tetras.

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Scientific name: Hyphessobrycon herbertaxelrodi
Temperament: Peaceful
Origin: Brazil
Size: 1.5 inches (3.8 cm)
Minimum Tank Size: 15 gallons (57 L)
Diet: Granules, flakes, frozen/live foods
pH: 5.0-7.5
Temperature: 68-82°F (20-28°C)
Difficulty to breed: Moderate

Black neon tetras are more resilient than standard neon tetras and much more forgiving of water parameter fluctuations. They’re a good alternative to neons for new keepers who want that mid-water schooling aesthetic without the fragility. Keep 8 or more. Their black and iridescent white stripe is sharp and attractive, especially against dark substrate.

Mark’s Pick

If I’m setting up a beginner community tank from scratch, here’s the stocking I’d recommend for a 20-gallon (76 L) long: 8 zebra danios or harlequin rasboras for mid-water, 4-6 corydoras for the bottom, and 1 bristlenose pleco for algae duty. That’s a tank that will run reliably, teach you the basics of water chemistry and feeding dynamics, and be visually interesting every day. Once that’s stable for 3 months, you have the experience to start adding more challenging fish.

Fish That Aren’t Actually Beginner Fish

These species get sold to beginners regularly and cause the most early failures:

Avoid These as a Beginner

Goldfish: Cold-water fish that don’t belong in tropical community tanks. They produce massive waste. A single goldfish needs 20 gallons (76 L) minimum and a powerful filter. They’re intermediate fish that require significant setup knowledge.
Cichlids (most species): Territorial, aggressive, and water-chemistry demanding. German blue rams will die in an uncycled tank. African cichlids need specific hard, alkaline water and tank setups most beginners don’t understand yet.
Discus: One of the most parameter-sensitive freshwater fish available. They need 82-86°F (28-30°C), pristine water, and a mature tank. Definitely not beginner territory.
Common plecos: Sold cheap, grow to 12-18 inches (30-46 cm), produce enormous waste. Most end up surrendered or in a tank too small for them within 2 years. Get a bristlenose instead.
Bettas in community tanks without research: Bettas with fin-nippers (tiger barbs, serpae tetras) end up shredded within a week. Know your tank mates before adding a betta.

Quick Comparison: Best Beginner Fish by Setup

Fish	Best Setup	Min Tank	Forgiveness Level
Zebra Danio	Any community	10 gal (38 L)	Very High
Betta	Solo 5+ gal (19+ L) tank	5 gal (19 L)	High (in solo setup)
White Cloud Minnow	Cold-water community	10 gal (38 L)	Very High
Corydoras	Community, bottom layer	15 gal (57 L)	High
Bristlenose Pleco	Any tank needing algae control	30 gal (114 L)	High (needs driftwood)
Cherry Barb	Community, peaceful tank	15 gal (57 L)	High
Black Neon Tetra	Community, mid-water schooler	15 gal (57 L)	High

Frequently Asked Questions

What is the absolute easiest fish to keep?

Zebra danios. They’re the most forgiving freshwater fish commonly available. They handle temperature fluctuations, imperfect water chemistry, and beginner errors better than almost anything else. They’re active, they school, they’re inexpensive, and they’re available everywhere. If you can keep danios alive and healthy, you have the fundamentals of fishkeeping down.

Do easy fish still need a cycled tank?

Yes. Every tank needs to be cycled before adding fish. The nitrogen cycle establishes the beneficial bacteria that convert ammonia and nitrite into less harmful nitrate. Without it, even the hardiest fish will be exposed to toxic ammonia spikes. Cycle the tank for 4-6 weeks with an ammonia source before adding any fish. This single step prevents the majority of early fishkeeper failures.

Are goldfish good beginner fish?

No. This is one of the most persistent myths in the hobby. Goldfish are cold-water fish that don’t belong in tropical community tanks. They’re also heavy waste producers that require much larger tanks and more powerful filtration than most beginners realize. A single goldfish needs at least 20 gallons (76 L). Start with danios, rasboras, or white cloud minnows instead.

Can I keep a betta in a 2.5-gallon tank?

Technically yes, but it’s not recommended. Bettas in small tanks are harder to maintain stable water quality in, experience more stress, and have shorter lifespans. A 5-gallon (19 L) tank with a small sponge filter and a heater is the realistic minimum for a betta to thrive rather than just survive. At 5 gallons (19 L), water quality is more stable and maintenance is more manageable.

How many fish can I put in a 10-gallon tank?

The standard rule is 1 inch (2.5 cm) of fish per gallon, but that’s a rough guide, not a hard rule. A 10-gallon (38 L) tank works well for a solo betta, a school of 6-8 nano fish (endler’s, chili rasboras, ember tetras), or a pair of smaller species. Don’t try to put schooling fish that need 6+ individuals into a 10-gallon (38 L) if they need 15-20 gallons (57-76 L) of space to school naturally.

Closing Thoughts

The fish on this list will carry you through the learning curve of fishkeeping. They’re forgiving enough to survive your inevitable beginner mistakes, interesting enough to keep you engaged, and affordable enough that the financial risk of early errors doesn’t end the hobby for you. The one thing they can’t do is compensate for a tank that isn’t cycled or set up correctly. Get the fundamentals right first, then stock the fish.

Ready to buy? Flip Aquatics quarantines their stock before shipping, which makes a real difference with nano fish that are often stressed in transit. Use promo code ASDFLIPPROMO at checkout.

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Founded in 2010. Robert and his team at Flip Aquatics have set the standard for conditioned freshwater fish. One of the best selections of freshwater schooling fish and nano species online.

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June 7, 2022

8 Types of Oscar Fish: Varieties, Care Requirements, and What to Expect

Expert Take | Mark Valderrama, AquariumStoreDepot

I’ve been in this hobby for 25+ years and I’ve worked in fish retail. Oscars are one of the fish I hesitate most to recommend to newcomers, not because they’re hard to keep, but because people consistently underestimate the commitment. A 75-gallon minimum is the floor, not the goal. A single adult oscar is a 15-year commitment that will dominate any tank you put it in. Set them up correctly and they’re one of the most rewarding fish in freshwater. Get that wrong and everyone loses.

Oscar fish are one of those species I always hesitate to recommend to new hobbyists. Not because they’re difficult to keep, but because people seriously underestimate how large they get and how much waste they produce. I’ve seen too many oscars end up in tanks that are way too small. When you set them up correctly, though, they’re one of the most interactive, personality-driven fish you can keep in freshwater. This guide covers all 8 types and what you need to make them thrive.

There is one species. Eight color forms. Every single one needs 75+ gallons and serious filtration.

Key Takeaways

All oscar “types” are the same species: Astronotus ocellatus. The differences are color and fin shape only
Minimum tank size is 75 gallons (284 L) for ONE adult. A 125-gallon (473 L) is far more realistic
Oscars produce enormous waste loads; oversized filtration is not optional
They rearrange decorations, uproot plants, and redecorate constantly
Oscars recognize their owners and are among the most personable fish in freshwater keeping
Lifespan is 10 to 15+ years. This is a long commitment

Oscar Fish Overview

Oscar fish (Astronotus ocellatus) are a South American cichlid from the Amazon River basin. They are not a community fish. They’re not a beginner fish in the traditional sense either, though they’re not particularly difficult once you accept what they actually need. The issue is that most people don’t accept it upfront.

The most commonly made mistake I see with oscars: someone buys a cute 3-inch (7.5 cm) juvenile at the store, puts it in a 40-gallon, and tells themselves they’ll upgrade when it grows. They don’t. The fish spends years in inadequate space, becomes aggressive and pale, and eventually gets rehomed or dies young. An oscar will hit 10 to 12 inches (25 to 30 cm) within 12 to 18 months under good conditions. Plan for the adult before you buy the juvenile.

The upside is that oscars are genuinely intelligent by fish standards. They recognize the person who feeds them. They beg, they interact with their reflection, they have moods. There’s a reason they’re called the aquarium puppy. But that personality requires space and proper care to actually show up.

Oscar Fish Care Requirements

Tank Size

The bare minimum for a single adult oscar is 75 gallons (284 L). A 125-gallon (473 L) is the realistic target for a healthy, low-stress adult. For a pair, 150 gallons minimum. There is no workaround for this. Oscars in undersized tanks develop dark coloration, aggression, and dramatically shortened lifespans.

Filtration

Oscars eat heavily and produce waste accordingly. A powerful canister filter rated for at least double your tank size is the standard recommendation. Many oscar keepers run dual canister filters or a canister plus sump. Weekly 30 to 50% water changes are the norm. Test your water regularly. Ammonia spikes from oscar waste can happen fast in an undertiltered system.

Natural Habitat

Oscars are from slow-moving rivers and tributaries in South America, primarily the Amazon basin. They prefer lower light, silt substrate, and wood and rock structure for territory. These are not high-flow fish. They don’t need powerheads or surface agitation beyond what good filtration provides. Sandy substrate suits them well and they’ll excavate it constantly looking for food.

Live Plants

Oscars and live plants rarely coexist. Oscars uproot, shred, and rearrange everything. If you want plants, use heavy root systems like Amazon swords in large pots or go with floating species. Most oscar keepers give up on live plants and use sturdy decorations that can be relocated without breaking.

Temperament and Behavior

Oscars are territorial, not aggressive in the typical cichlid sense. They won’t attack tank mates without a reason. The reason is usually territory or food. Anything small enough to fit in their mouth is food. Anything that intrudes on their territory will be chased. Oscars kept alone in adequate space are generally mild-mannered. Problems arise when tank mates are too small, too slow, or too similar in appearance to trigger cichlid rivalry behavior.

They rearrange the tank. This is not a bug. Oscars will move gravel, relocate decorations, and dig regularly. Don’t anchor decorations with anything you can’t remove. They do it because they’re establishing territory in the way their instincts tell them to. Accept it and design the tank accordingly.

Tank Mates

The safest choice for most oscar keepers is no tank mates. If you have 125+ gallons and want to try, the goal is fish too large to be eaten and similar enough in toughness to hold their own. Good options:

Severum cichlid (Heros severus), shares similar water parameters; large enough to coexist
Green terror cichlid (Andinoacara rivulatus), comparable size and toughness
Silver dollars (Metynnis spp.), fast-moving schooling fish large enough to avoid being eaten
Parrot cichlids (Hoplarchus psittacus) in large tanks

Avoid anything under 5 inches (13 cm). Avoid long-finned fish. Avoid slow-moving cichlids that will sit and absorb aggression without defending themselves.

Diet

Oscars are primarily carnivores and eat nearly anything. In the store they often look like they’ll eat forever and they will, which is a problem. Overfeeding drives water quality issues fast in a fish this size. Feed high-quality cichlid pellets as the staple and supplement with live or frozen foods like worms, shrimp, and insects. Feed only what they’ll consume in two to three minutes, once or twice daily. Remove uneaten food immediately.

ASD Difficulty Rating: Oscar Fish

Dimension	Rating	Notes
Water parameters	Easy	Adaptable to a wide range of conditions
Feeding	Easy	Will eat almost anything; overfeeding is the real risk
Space requirement	Difficult	75+ gallons minimum; 125+ gallons realistic
Filtration demand	Difficult	High waste producer; needs oversized filtration
Community compatibility	Difficult	Not a community fish; limited tank mate options
Long-term commitment	Difficult	10 to 15+ year lifespan

8 Types of Oscar Fish

Before we get into individual types: every oscar on this list is Astronotus ocellatus. Same species, same care requirements, same tank size, same diet, same lifespan. The differences are color pattern and fin shape only. Don’t let the variety names mislead you into thinking these are meaningfully different fish to keep.

1. Tiger Oscar

Adult Size: 10 to 12 inches (25 to 30 cm)
Color Pattern: Orange and red marble on a black or dark brown body
Unique Traits: Dorsal fin eyespot; the base form of the species

The tiger oscar is the original form of Astronotus ocellatus and the most commonly available oscar in the hobby. The orange-red marble pattern on a dark body, combined with the distinctive eyespot beneath the dorsal fin near the tail, is what most people picture when they think “oscar fish.” Easy to find, widely bred, and as hardy as oscars get. This is the starting point for most oscar keepers and the benchmark against which all other varieties are compared.

2. Red Oscar

Adult Size: 10 to 12 inches (25 to 30 cm)
Color Pattern: Orange-red body with minimal black or grey
Unique Traits: Fiery body; reds and oranges intensified through selective breeding

The red oscar takes the warm tones of the tiger oscar and pushes them to the extreme. Most of the body is orange-red, with black or grey limited to the face and fins. The most desirable red oscars approach a uniform red body with almost no dark coloring at all. Quality varies considerably and so does price. The chili red and albino super red tiger are sub-varieties within this category, each pushing the red intensity further.

3. Albino Oscar

Adult Size: 10 to 12 inches (25 to 30 cm)
Color Pattern: Platinum white body with possible light pink shading
Unique Traits: Pink or red eyes; true albinism, not lutino

True albino oscars have a genetic condition that reduces melanin production, resulting in a near-white body with no marbling and pink or red eyes. Genuine albinos are less common than advertised. Many fish sold as albino are actually lutino, which has marbled orange patterning and orange or dark red eyes. Check the eye color: pink or red eyes indicate true albino; orange eyes indicate lutino. Care requirements are identical to tiger oscars.

4. Lutino Oscar

Adult Size: 10 to 12 inches (25 to 30 cm)
Color Pattern: Platinum white body with orange or yellow marbling
Unique Traits: Orange eyes; commonly mislabeled as albino

Lutino oscars are not truly albino, though they’re frequently sold that way. The key difference is patterning and eye color. Lutinos retain the orange marble pattern on a white or pale base body, and their eyes are orange or dark red rather than pink. They’re easier to find than true albinos and make for a striking display. Don’t pay albino premium prices for a lutino; know what you’re looking at before you buy.

5. Black Oscar

Adult Size: 10 to 12 inches (25 to 30 cm)
Color Pattern: Dark grey to black body with overlaying bands
Unique Traits: Intensified dark tones; lighter belly; some orange may be present

The black oscar pushes the dark elements of the tiger oscar’s coloration to the forefront. The body is a uniform shade of grey to near-black with overlaying darker, marbled bands. Some orange or red patterning may appear, but it’s minimal. The belly is typically lighter. Natural tiger oscars vary in darkness, but a true black oscar variety lacks the intense orange marbling of the tiger and presents as consistently dark. The effect in a well-lit aquarium can be genuinely impressive.

6. Veil Tail Oscar

Adult Size: 10 to 12 inches (25 to 30 cm)
Color Pattern: Tiger oscar coloration (orange and black) with elongated fins
Unique Traits: Bred for extended finnage; fins can become heavy and drag

The veil tail oscar is bred for elongated, flowing fins rather than a color variation. The typical tiger oscar coloration carries over, but the dorsal, anal, and tail fins are dramatically extended. These extended fins are striking but come with tradeoffs: they’re susceptible to fin nipping from tank mates, and in some individuals the fins become too heavy to carry comfortably, leading the fish to rest frequently on surfaces. Don’t pair veil tails with any tank mate that has shown fin-nipping tendencies.

7. Lemon Oscar

Adult Size: 10 to 12 inches (25 to 30 cm)
Color Pattern: Creamy white body with yellow to bright yellow shading
Unique Traits: Yellow coloration; unusual for a large predatory freshwater fish

The lemon oscar’s appeal is its unusual coloration. Yellow is rare in large predatory freshwater fish, which makes a quality lemon oscar genuinely striking. Most specimens are creamy white with hints of yellow; only the highest-quality examples show vivid yellow throughout. Can be confused with albino or lutino varieties when yellow intensity is low. Popularity has made them increasingly available, though quality varies considerably by source.

8. Blue Oscar

Adult Size: 10 to 12 inches (25 to 30 cm)
Color Pattern: Contrasting shades of blue with some orange marble patterning
Unique Traits: Extremely rare; the depth of blue is unmatched in other oscar varieties

The blue oscar is the rarest variety on this list and among the hardest to find in the hobby. These are selectively bred fish with intricate blue shading where individual scales vary in intensity, contrasted by orange marbling. The result is a depth of color that stands apart from other cichlids marketed as blue. If you find one that’s genuine and reasonably priced, it’s worth it. Most fish sold as blue oscars are either mislabeled or low-quality specimens with minimal color development.

Mark’s Pick: Best Oscar for First-Time Oscar Keepers

The tiger oscar. It’s the hardiest, most widely available, and easiest to source a quality specimen of. The color varieties are fun to look at, but the tiger gives you the full oscar experience without any of the added complexity of tracking down a quality albino or lemon. Get your setup right, get the filtration right, and start with a tiger. You’ll understand what makes these fish special within a few months.

Choosing the Right Oscar Variety

Variety	Availability	Choose If…
Tiger	Most common	You want the classic look and don’t want to hunt for a specimen
Red	Common	You want maximum warm color without going albino
Albino	Moderate; often mislabeled	You want the white body and can verify true albinism before buying
Lutino	Common; sold as albino	White-based body with some pattern; verify eye color
Black	Moderate	You prefer dark, dramatic fish over bright color
Veil Tail	Specialty stores	You keep the oscar alone with no fin-nipping risk
Lemon	Moderate	You want something genuinely unusual in a large cichlid
Blue	Rare; hard to verify quality	You have a trusted source and budget for a specialty specimen

Avoid Oscars If…

Your tank is under 75 gallons (284 L); a 125-gallon (473 L) is the realistic minimum for a healthy adult
You have a community tank with fish under 6 inches (15 cm); they will eventually become food
You’re not prepared for weekly large water changes and oversized filtration
You’re attached to live plants; oscars will destroy them
You want a fish you can keep for a few years; oscars live 10 to 15+ years and that is a real commitment

Closing Thoughts

Every oscar type on this list is the same fish. The care requirements don’t change based on color. What changes is how hard it is to find a quality specimen. Start with the tiger oscar if you’re new to the species. Get the tank and filtration right first, before you add the fish. A 75-gallon minimum, heavy-duty canister filtration, and weekly water changes are the foundation. Get those in place and you’ll have one of the most personable, interactive fish in freshwater. Get them wrong and you’ll join the long list of people who’ve had to rehome an oscar they weren’t actually prepared for.

If you’re ready to add an oscar, Flip Aquatics and Dan’s Fish are reliable sources for healthy, well-conditioned cichlids. Both ship properly acclimated fish and stand behind what they sell.

📚 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.

June 6, 2022

Swordtail Fish Care: Complete Guide (Including the Platy Hybrid Fact Most People Miss)

Swordtails are jumpers. If your tank does not have a lid, you will lose fish. They are also more aggressive than most livebearer guides mention, especially males competing for females.

One male to three females minimum. Break that ratio and you will see aggression.

The biggest challenge with Swordtail Fish is not keeping them alive. It is managing how fast they multiply.

The Swordtail Fish breeds constantly and lives 3 to 5 years. You need a plan for fry before you buy your first pair, or your tank will be overrun within months.

Livebearers teach you more about population management than any textbook ever will.

ASD Difficulty Rating: Tier 1 – Beginner

Swordtail fish are hardy, active livebearers suitable for community tanks from 20 gallons. They prefer slightly hard, alkaline water and breed prolifically. Males will chase females – multiple females per male is required.

What Most Care Guides Get Wrong About Swordtail Fish
A Brief Overview Of The Swordtail Fish
Classification
Swordtail Fish Origins and Habitat
What Do They Look Like?
Care – Temperament and Activity Level
What Are Good Tank Mates for Swordtails?
What Do They Eat?
Setting Up Your Tank
Breeding
Is the Swordtail Fish Right for You?
How the Swordtail Fish Compares to Similar Species
Final Thoughts
The Reality of Keeping Swordtail Fish

Swordtails are one of the classic beginner livebearers. Hardy, colorful, and genuinely interesting to watch. The males develop that distinctive elongated lower tail fin that gives the fish its name, and it’s one of those features that looks better in person than in photos. Like platies and guppies, they’re undemanding and adapt well to a range of conditions, which makes them great for community setups. One thing worth knowing: swordtails and platies are closely related and can actually interbreed, so if you keep both you may end up with hybrids. Males can also be aggressive toward each other, so a ratio of one male to two or three females keeps the peace. Here’s everything you need to keep them well.

Swordtails breed faster than most keepers expect. One pair becomes thirty in months. If you do not have a plan for fry, they will make one for you.

What Most Care Guides Get Wrong About Swordtail Fish

The most common mistake I see with swordtail fishs 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. Swordtail Fishs 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, swordtail fishs are adaptable. But “adaptable” doesn’t mean they’ll thrive in just anything. In my experience, keeping them closer to their natural soft, slightly acidic conditions brings out the best color and longevity.

The Reality of Keeping Swordtail Fish

Breeding is not optional. It is automatic. If you have males and females, you will have fry within weeks. Most new owners are not prepared for the population explosion. You need a plan, whether that is a grow-out tank, selling to a local store, or keeping predators that naturally control numbers.

Water hardness matters more than people realize. Livebearers come from hard, alkaline water. Keeping them in soft, acidic conditions leads to chronic health problems, fin clamping, and shortened lifespans. If your tap water is soft, livebearers are not ideal unless you buffer the water.

Male aggression is constant. Males chase females relentlessly. Without a ratio of at least two females per male, the females get stressed, stop eating, and weaken. Overcrowding males does not solve this. It makes it worse.

Biggest Mistake New Owners Make

Buying one male and one female thinking it will be manageable. Within three months you have 30 to 50 fish in a tank designed for 10. Always plan for breeding output before you buy your first pair.

Expert Take (Mark Valderrama, AquariumStoreDepot)

If you are keeping livebearers, you are a breeder whether you planned to be or not. Accept it early and have a plan for the fry. That single decision prevents 90% of livebearer problems.

A Brief Overview Of The Swordtail Fish

Scientific Name	Xiphophorus hellerii
Common Names	Specific names depend on coloration; widely referred to as swordtail fish
Family	Poeciliidae
Origin	North America and Central America
Diet	Omnivore
Care Level	Easy
Activity	Peaceful
Lifespan	3. 5 years
Temperament	Peaceful
Tank Level	All levels
Minimum Tank Size	20 gallons
Temperature Range	64 ° to 82 °F
Water Hardness	1. 12 dKH
pH Range	7.0. 8.2
Filtration/Water Flow	Moderate to high
Water Type	Freshwater
Breeding	Livebearer
Difficulty to Breed	Easy
Compatibility	Community tanks
OK, for Planted Tanks?	Yes

Classification

Taxonomic Rank	Classification
Common Name	Swordtail Fish
Scientific Name	Xiphophorus hellerii
Order	Cyprinodontiformes
Family	Poeciliidae
Genus	Xiphophorus
Species	X. Hellerii

Swordtail Fish Origins and Habitat

Swordtails are one of the most easily recognizable freshwater fish in the entire aquarium hobby. The swordtail fish have been bred to display all colors and pattern variations while still maintaining their status as being one of the easiest species to keep in the freshwater aquarium. These aquarium fish didn’t start out like this, though.

Instead, swordtails originate from North and Central America, specifically from Veracruz in Mexico to northwestern Honduras. There, they are found in a variety of ecosystems with varying altitudes, turbidities, depths, water flows, and even salinities. Most often, they are found in relatively shallow systems with dense vegetation. Adults are likely to be in areas of high flow while juveniles will stick towards the margins where conditions are calmer.

Unfortunately, swordtail fish have entered the waterways of many nonnative continents and countries. They are largely found throughout portions of South America, Africa, and Australia where their invasive populations harm native species¹. Most of these populations have been established through aquarium releases.

Originally, these freshwater species were known as green swordtail fish due to their natural green bodies and red accents. Through the years, these swordtail fish were very carefully bred for color and pattern combinations which eventually led to the overwhelming array of choices available today.

As we’ll see though, colors aren’t the only thing that has changed about the swordtail fish.

How Long Do Swordtails Live?

Swordtails can live a surprisingly long time. On average, the swordtail fish is expected to live 3-5 years in good water and tank conditions.

For experienced keepers, this is a problem.

Swordtails, like other livebearing species, are prolific breeders. Anytime there is a male and female swordtail fish present in the tank, there are likely to be baby swordtails. Adding a swordtail to an aquarium can potentially limit hobbyists in their future livestock additions due to reproduction rates and overstocking.

What Do They Look Like?

Swordtails are very recognizable due to their famous feature: their tail that resembles a sword!

On average, swordtail fish grow to be about 5 inches, though they can measure up to 6 inches and can become quite plump. They have a wide, torpedo-shaped body and round stomach. They are unique in that their dorsal fin is higher than other tropical freshwater fish and the bottom ray of their caudal fin extends well past the rest of their tail.

This extension makes sexing swordtail fish easy. Males have this feature while females do not; females have a rounded caudal fin with no other special markings and resemble a platyfish (Xiphophorus maculatus). Males are also more colorful and smaller than their female counterparts.

The most common color for swordtails to come in is red; the whole body will be red with a noticeable darker mid-lateral line, especially on the males. The fin extension may also be a different color from the rest of the body or have different colored margins depending on the variety of fish.

Swordtail Varieties

Once originally known as the green swordtail, beautiful though plain in color, these aquarium fish have been selectively bred to display almost every color and every pattern combination, mostly consisting of reds, yellows, and oranges.

It should be noted that swordtails have successfully been hybridized with other species within the Xiphophorus genus, making the possibilities endless.

Here are some of the most common colors to come across as well as the most designer swordtail varieties available:

Red swordtail. The red swordtail fish is the most common variation to come across. Both males and females are uniform in color, though males may have a black margin to their tail fin extension.

Red wag swordtail. The red wag swordtail is a normal swordtail but with black fins. All other features and requirements are the same as the regular red swordtail.

Pineapple swordtail. The swordtail fish with the best name, these swordtails have a red back with a pale yellow body and white belly. They may have slightly shorter fin extensions than other varieties, which is a favorable combination along with their colors.

Red lyretail swordtail. These swordtail fish are named after the instrument as both males and females have a u-shaped tail fin. The body is light orange/red while the dorsal and tail fins are black.

Hi fin lyretail swordtail. An even more accentuated version of the red lyretail swordtail, the hi fin attribute comes from the extremely elongated dorsal fin which is almost as long as their tails; females do not have such exaggerated features. Colors include red, orange, and yellow. Because of their extreme features, hi fin lyretail swordtails need at least a 30-gallon tank and very carefully chosen tank mates that won’t nip at fins.

Are They A Type Of Molly Fish?

Mollies, platies, swordtails. They all kind of look the same and have similar care requirements, but what makes them different?

Swordtails are not a type of molly or platy, even though they are all closely related. Looking at the scientific categorization of these freshwater species, swordtails are Xiphophorus hellerii, mollies are Poecilia latipinna, and platies are Xiphophorus maculatus.

As we can see, mollies are in a different scientific genus altogether. However, swordtails are in the same genus, Xiphophorus, as platies and are very closely related. Though there are slight variations between these two species–namely, the absence of the elongated tail fin in platies–there is a larger difference in geographic distribution.

The Xiphophorus genus is split into three phylogeographic clades based on origin. Platies are native to eastern Mexico and Central America. Northern swordtails are found in very specific regions of northeastern Mexico. Southern swordtails, like the ones listed in this article, originate from southern Mexico and northern Central America.

Care – Temperament and Activity Level

Swordtail fish are a favorite among beginner hobbyists due to their flashy and active behavior. These fish will quickly fill up empty space in the upper and middle portions of the tank, only venturing to the bottom for food.

While great additions to the community tank, swordtails is slightly aggressive towards each other, specifically from male to male. As we’ll see, it’s recommended to keep a very high male-to-female ratio to keep males from becoming aggressive to one another. Males may also become aggressive to similar-looking fish of other species.

Otherwise, these active fish will provide constant movement to the aquarium display. When they’re not looking for food to pick off of plants and decorations, they’ll be looking to mate.

What Are Good Tank Mates for Swordtails?

Swordtails are compatible with most freshwater fish. They are big enough to tolerate larger, slightly more aggressive species while bringing out the best in smaller, schooling types.

The most important thing to consider when choosing swordtail fish tank mates is fin nipping. These fish have beautiful fins that you don’t want to see get shredded or infected with fin rot!

Here are some of the best tank mates for swordtails:

Platies
Mollies
Guppies
Corydoras
Angelfish
Gouramis
Tetras
Danios
Barbs

Remember that swordtail fish are capable of hybridizing with platies. While this isn’t necessarily wrong to allow happen, hybridization can lead to some genetic mutations and loss of color lineages.

It should also be noted that keeping swordtails with other prolific livebearers, like platies or guppies, can quickly lead to overpopulation if not controlled.

How Many Swordtails Should Be Kept Together?

Contrary to popular belief, swordtail fish are not a schooling species. They like to be in group settings but won’t actively follow around the other swordtails in the tank for protection.

That being said, swordtail fish do best when kept in groups of 4 to 6. At least two or three females should be kept for every one male. Hobbyists have had success keeping only one male swordtail fish in a tank–which is the preferred setting if wanting to avoid any chances of reproduction–but they will thrive in a social community setting.

Since male and female fish are so easy to tell apart, I recommend you skip a male addition altogether. However, there is the chance for females to already be pregnant before adding them to your tank.

Can Bettas and Swordtails Live Together?

Another great beginner fish is the Betta (Betta splendens). These fish are nowhere near as active as the swordtail fish but males are especially colorful with bold personalities. So much so that betta fish are notorious fighting fish that could easily injure a swordtail if paired together.

Because of this, bettas should not be attempted to live with swordtails. These two fish are not compatible tank mates as swordtails are overly active and can become fin nippers. This could stress out your betta and lead to infection.

What Do They Eat?

Swordtail fish are omnivores and will gladly eat whatever they are given. They will love foraging for food on live plants and other decorations, but will readily accept an assortment of live, frozen, and freeze-dried foods, like bloodworms, brine shrimp, and mosquito larvae.

To maintain their color, a high-quality tropical fish flake food or pellet should be offered daily; quality flake food is slightly more preferred as they stay at the water’s surface longer. Swordtail fish may also be given algae pellets or flakes as well as blanched vegetables from time to time.

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What Plants Do They Eat?

While foraging for food on live plants, swordtail fish have been known to accidentally–or purposely–eat some leaves.

Swordtails are great algae eaters and will help keep plants free from pests. However, they are so efficient that they might not be able to tell algae apart from a desired live plant. This behavior is deterred by feeding more often or adding less desired plants that are meant to be eaten.

Setting Up Your Tank

Swordtails are very hardy fish and can live in a variety of aquarium setups. Like any fish, swordtail fish need to be kept in a fully cycled aquarium with stable water parameters. Swordtail fish is slightly messier than other freshwater fish so it’s important that the mechanical and biological filtration systems are ready to handle the bioload.

Swordtail fish look especially great in a densely planted aquarium on a dark substrate. They will need an aquarium hood to prevent them from jumping out.

Tank Size

Swordtail fish are one of the more demanding beginner species when it comes to tank size. These fish are relatively big, active, and need to be kept in small groups. They can also create a lot of bioload for so few fish.

To help bolster the biological filtration system and to give your swordtail fish enough space to swim, a 20 gallon long tank is recommended. A long tank will give much more space for your fish to swim than a tall tank. Even bigger tanks will allow for a much larger selection of fish to choose from.

Filtration

To keep up with bioload, the filter should be rated for at least 2x the size of the aquarium. In regards to swordtail fish, it’s pretty difficult to give too much filtration.

If you remember, these fish live in areas of high flow in their natural habitat. Though most swordtails in the aquarium hobby have adapted to living in community tanks with minimal flow, swordtail fish can surely survive a tank set up with a high water current.

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This water flow is created with filters, powerheads, and wavemakers. Just remember that other community fish might not be able to handle such high water currents as well as your swordtail fish.

Water Parameters

Swordtail fish are very forgiving of incorrect water parameters, but that doesn’t mean that you shouldn’t strive to give them the best. Like any other fish, swordtails will succumb to sudden fluctuations in water parameters.

Swordtails is kept in a cooler water temperature, though stability is key. A changing water temperature can quickly cause fish to go into shock, so a heater for temperature regulation is strongly recommended. It is also advised to keep swordtail fish in tropical water temperatures in order to have the most choices when it comes to possible tank mates.

Otherwise, swordtail fish need a neutral pH level with limited nitrates.

Breeding

Breeding swordtail fish is straightforward and a matter of when rather than if. Swordtails are livebearing fish which means that they will give birth to live young.

First, get a good mix of female and male swordtails. Experienced keepers choose to remove their mating pairs from the main tank display into a specific breeding tank, though this isn’t entirely necessary.

Once ready, males will chase after females and the two fish will mate. Over the next few weeks, the female will grow plumper in appearance until she’s ready to give birth. When she’s ready, she will birth anywhere from 50-200 live fry. Not to mention that females can give birth once every month or so!

The fry will be immediately independent and susceptible to being eaten by the parents and other fish; this isn’t a concern as the brood is so large and reproduction can happen so often.

To increase the chances of fry surviving, they should be placed in their own tank or given plenty of coverage in the form of live plants. Small foods, like baby brine shrimp, will need to be offered until they are ready to accept larger foods.

Hard Rule: Keep at least 2–3 females per male swordtail. A single female harassed by one male will be stressed to death. The female-to-male ratio is non-negotiable.

Is the Swordtail Fish Right for You?

Before you add a swordtail fish 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. Swordtail Fishs 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 swordtail fish 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.

Avoid If:

You have no plan for constant fry production – swordtails breed without any intervention
You want only males – male swordtails fight each other aggressively
You have a heavily planted, slow community tank with shy, small species they may harass
You want a species that stays manageable in numbers – populations grow fast

How the Swordtail Fish Compares to Similar Species

Want color and activity without breeding headaches? Get all males. Want a self-sustaining colony? Get a proper male-to-female ratio and a grow-out tank.

Choosing between similar species is tricky. Here’s how the swordtail fish stacks up against some common alternatives.

The swordtail fish 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 swordtail fish or something similar that’s more widely available. The answer comes down to three things: tank size, water parameters, and what other fish you’re keeping. If your setup matches what the swordtail fish needs, it’s hard to beat. If not, there are alternatives worth exploring.

Final Thoughts

Swordtail fish are a popular addition to beginner hobbyist’s fish tanks. These swordtail fish are big, active, and easy to care for but do require some special attention when it comes to water flow and keeping males together.

Otherwise, these peaceful fish are fun and easy to breed, allowing hobbyists to make their own designer swordtail varieties along the way!

May 30, 2022

Betta Sorority Tank: The Good, The Bad, and What It Actually Takes to Make It Work
Betta sororities fail more often than they succeed. Multiple female bettas in one tank sounds great. The reality is constant stress, hidden aggression, and slow deaths that most keepers do not notice until it is too late.

If you cannot commit to a heavily planted 40-gallon tank with 6 or more females, do not attempt a sorority.

If you cannot commit to a heavily planted 40-gallon tank with 6 or more females, do not attempt a sorority.

A betta sorority is one of the most dynamic and visually striking setups in freshwater. But I’ve seen more sorority tanks go wrong than right, especially when they’re set up by hobbyists who treat it like a standard community tank. Female bettas is just as aggressive toward each other as males. The difference is that aggression in a sorority is managed with the right conditions: a minimum of 5 females (odd numbers prevent one fish from being singled out), a heavily planted tank with plenty of line-of-sight breaks, and 20+ gallons. Skip any of those and you’ll end up with one dominant fish terrorizing the rest. This guide covers what it actually takes to run a stable sorority long-term.

What Is A Betta Sorority?

A betta sorority is a term used in the freshwater fishkeeping hobby for when multiple betta fish are kept together in the same tank. This mostly comprises of smaller, less color female bettas of the Betta splendens species. These setups have become increasingly popular over the years, and here’s why.

To start, there is a huge misconception about the true care requirements of betta fish as a whole. Too often, these fish are kept in tight spaces with no heater or filtration. Some beginner hobbyists see female betta fish as smaller and more docile than males, meaning that they is kept in even smaller tanks with other fish.

This simply isn’t true and hobbyists are fighting for overall better betta care. However, these bare minimum care requirements continue to be pushed to their limits with a new fad, female betta sororities.

Female betta sororities are not all bad though, and many experienced hobbyists have been very successful at raising beautiful tanks with dozens of female bettas. The trick is knowing the ins and outs of betta behavior, providing more than adequate aquarium care, and being able to monitor and quickly resolve any issues that arise.

How Many Betta Fish Are In A Sorority?

Two’s a couple, three’s a crowd, but when does a group of female betta fish turn into a sorority?

In general, a sorority contains about four to five female bettas. In these cases, more fish equals fewer chances of aggression, which leads some hobbyists to having a sorority tank with dozens of bettas!

Why is five female betta fish the magic number for a successful sorority tank?

If you’ve ever kept a school of tropical fish before, then you might have noticed some interesting behaviors in terms of group dynamics. When dealing with small schools, the fish tend to lose track of each other. This results in one or two fish straying off to create their own school. Female bettas share this same behavior and might pair off given the chance.

However, a worse case is that your bettas pair off into small, aggressive groups. This is when the odd-one-out becomes the target of aggression from the rest of the group, possibly due to size, color, or another unknown factor.

To help keep female bettas from pairing off, it’s recommended to add a decently large group all at once. This will prevent larger and more aggressive individuals from claiming too much territory in the tank before the other ones have the chance.

Female Controversy

One of the biggest debates in the freshwater aquarium hobby is about female betta fish sororities.

One side believes that they are doomed from the very beginning and that even a very successful betta sorority tank will eventually take a turn for the worst¹. The other side believes that these fish can live unproblematically together as long as some basic conditions are met. Depending on who you are talking to, a betta fish sorority can either be one of the most exciting tank setups to have or a money sink that will prove to be a failure.

We personally believe that betta fish sororities is successful as long as care requirements and tank conditions are met. Even though betta fish is the perfect fish for beginners, keeping them in sororities is an entirely different story and should only be attempted by experts to avoid unnecessary fish deaths.

Before setting up a betta sorority tank, it’s important to understand the truth about female betta aggression.

Do Female Bettas Fight?

Yes, female bettas fight. Betta splendens are territorial and aggressive as a species, regardless of male or female. These fish form tight territories in the wild that they will defend to the death if need be.

In the aquarium hobby, it’s often said that female betta fish are much more peaceful than their male counterparts. For the most part, this is on a fish-to-fish basis and females have been known to be just as aggressive as males.

However, there is some truth to female betta fish being more peaceful than male betta fish as they is kept together in large groups. As we’ll see, it is likely that you’ll run into one or two problematic individuals, though.

Setting Up A Female Tank

Setting up a betta sorority aquarium is not very different from setting up an aquarium for a single betta fish. The main difference comes from acclimating the fish to the aquarium setting and to each other.

Tank Size

Tank size is very important for keeping a successful betta sorority tank. While bettas is kept in a small tank under 5 gallons on their own, a sorority should be given plenty of space.

Not only does more space allow for better water quality, but aggression can also be spread out across the tank. A bigger tank means that each female can have the respective space that won’t make her feel threatened.

Some hobbyists have successfully kept a betta sorority in a 10 gallon. We do not recommend this unless the fish has previously been held together for extended periods of time. Instead, five female bettas is kept in a 20-gallon aquarium, preferably a longer tank that allows for more horizontal swimming space.

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Even then, a 20 gallon tank is small for a betta sorority and limits the number of tank mates that is kept with them, which will become a crucial aspect later on.

Tank Setup

Betta fish are very tolerant of poor water conditions on their own but a sorority needs pristine water quality and a planned out tank setup. The best-looking female betta tank setups have a sand substrate, dim lighting, and are heavily planted.

A sand substrate isn’t necessary and female bettas will happily live on a gravel substrate. However, gravel has been known to tug at long fins and collect detritus. Injured fins can quickly turn into fin rot while sitting fish waste can lead to water quality problems. Both situations are not ideal and can lead to a system crash.

Betta fish come from the acidic, tannin-stained waters of Southeast Asia. When organics leak into the water, they change the color of the water and add certain benefits to the surrounding ecosystem, such as a bolstered immune system in fish.

This tannin-stained water is replicated by adding dried leaves, such as Indian almond leaves. There are several ways to introduce tannins into the system, be it through a tannin extract, a leaf litter substrate, or a singular leaf every few months. The darkness of the water will encourage fish to come out into the open and make them feel more comfortable overall.

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In addition to tannins, heavy foliage and the use of driftwood and rocks will encourage your fish to display their natural, nonaggressive behaviors. Remember, betta fish are territorial animals that like to setup a space of their own. Providing them with several carefully placed structures throughout the tank will help keep them away from each other. Floating plants can also add extra coverage and a source of food.

Filtration should be appropriately sized for the tank and the given bioload. The same nano problem of an overly strong water current is possible, though a larger tank helps diffuse a direct current. Still, the filtration need to be baffled or creatively angled as to not push the fish around.

Water Parameters

Betta fish show their best colors when given a high-quality diet, correct tank conditions, and water parameters are met. A stressed-out betta will quickly lose its color and might even develop stress stripes, which appear as dark horizontal lines across the sides of your fish.

Incorrect water conditions are the fastest way to stress out a betta fish. Even though these fish have adapted to live in some of the most unforgiving ecosystems in the world, they are still sensitive to fluctuating parameters and improper care.

To keep your betta fish happy and healthy, these water parameters must be met in addition to 0 ppm ammonia and nitrite:
- Nitrate: <20 ppm
- Water temperature: 78-80° F
- pH: 6.0-7.5
- KH: 3-5 dKH
Most betta fish have been born and raised within the aquarium hobby and are kept in neutral pH aquariums. If adding tannin-releasing organics to the fish tank, the pH will naturally drop due to chemical changes. This change in pH will not affect fish as long as changes are made over time and not all at once.

There is also some discussion about whether or not betta fish need heaters. Male and female bettas are tropical fish that need warm temperatures to live. Cold and fluctuating temperatures can cause your fish to go into shock and subsequently die. Even if the room temperature is close to that of the preferred one for bettas, small yet constant fluctuations can also stress out your fish.

For this reason, it’s always recommended to use an aquarium heater when keeping betta fish. A tropical water temperature will also allow for more tank mate pairings.

Managing Aggression In A Female Tank

The setup is easy. Maintaining peace among a group of female betta fish all together in the same tank is hard.

The betta sorority tank controversy stems from the unknown levels of aggression that these fish are capable of on an individual basis. Every fish is different. However, hobbyists have picked up a few trips and tricks to lessen aggression as much as possible.

These methods include social acclimation, good choice of tank mates, removal of bullies, and picking related bettas.

Social Acclimation

We’ve all floated our bags of fish in our tanks and waited patiently for a 2-hour drip acclimation to finish, but most hobbyists don’t bother to practice social acclimation. Adding new fish to a tank is stressful for both the hobbyist and the fish, especially when you’re adding several aggressive fish all at once.

Luckily, there are ways to minimize the chances of your female bettas from attacking each other at first glance. There are a couple of ways to approach social acclimation for female betta fish:
1. Quarantine the fish in adjacent tanks. Make sure that the fish are able to see each other through the sides of the glass. This is a safe way to introduce fish to each other without any chance of either getting hurt. However, this method is limited in how many fish you can keep side by side.
2. Keep pairs of fish together for short periods of time. Another option is to do trial runs of compatibility. This means keeping two or three bettas together in a smaller, more controlled tank and managing aggression as it arises.
Though these methods are not foolproof, they give a good idea as to how your bettas will react in each other’s company.

The Right Tank Mates

It’s strongly encouraged to keep tank mates in a female betta sorority tank, so think about potential stocking when picking out a minimum tank size. A bigger aquarium will always be better, especially when picking tank mates for female bettas tank mates.

Female bettas do best with active schooling fish. This might seem like a contradiction as solitary betta fish community tanks are recommended for slower, peaceful species. However, the logic behind keeping active schooling species makes a lot of sense.

These fish will serve as a distraction to prevent the female bettas from going after each other. Instead, the idea is that they take more interest in the other species around them. In return, the schooling fish have safety in numbers and can quickly evade an aggressive female betta if need be.

Not only will schooling fish distract your fish, but they also bring even more color and excitement to the aquarium. It’s recommended to steer clear of more aggressive and brightly colored species as this can create even greater competition. Female bettas are extremely colorful on their own, but carefully picked schooling fish is added to create contrast and interest.

Some possible female betta sorority mates are:
- Corydoras
- Rasboras
- Tetras
- Danios
- Loaches
Keep in mind that there is always the chance for a tank mate to be killed in the process. However, keeping your fish fed and providing enough hiding places in the tank should greatly increase the chances of long-term survival.

Female bettas may also be kept with snails and shrimp, which are beneficial cleanup crew members for the system. Likewise, it’s not uncommon for snails and shrimp to be eaten by female bettas, so expect to lose one or two in the process.

Removal Of Bullies And The Bullied

Once all fish have successfully been added to the aquarium, the real work begins. This work consists of keeping a happy and healthy betta sorority free of drama. This is definitely harder than it might sound in the beginning!

One of the best ways to avoid future problems is by socially acclimating your fish to one another. However, aggression can still happen between fish that have known each other for years and it’s important to know what to do should that happen.

If aggression is observed, remove the aggressive betta. Make sure that the bullied betta is safe and on its way to making a full recovery. This might mean also removing the bullied betta and placing it in quarantine until it’s able to hold its own in the tank; even if the other female bettas are initially aggressive, they may start to pick on a weakened betta.

Removal of the bullies and the bullied is what makes betta fish sororities so difficult to keep: you need the space to be able to quickly rehouse and recover bullies and bullied fish. Not many hobbyists have the spare room to have standby systems set up for just this problem.

Once the bully has been removed, the other female bettas need to sort out their hierarchy again. This may result in additional fin-nipping and chasing as they decide who’s at the top of the group.

Related Bettas

This is the most difficult step towards setting up a betta sorority and isn’t entirely necessary to make things work. If possible, always buy related betta fish or ones that have already been in the same tank for extended periods of time.

Related bettas are much more likely to get along than picking up random ones from several different stores. The best chance of getting related bettas is by going through a betta breeder directly. However, this might take more time than some hobbyists are willing to wait and is much more expensive than buying from a commercial pet store.

In addition, related bettas will be limited in color as they share the same genes. Buying separate bettas allows the hobbyist to handpick their sorority, which is much more aesthetically preferable.

Even if these bettas are related, it’s highly recommended to socially acclimate them to one another to prevent possible future aggressive behavior.

Final Thoughts

Aggression is common in betta sororities, but there are ways to mitigate it. By managing the requirements for joining a sorority and providing bigger tanks, you can create an environment where your bettas are more likely to thrive. If you’re looking for a low-risk option when adding new bettas to your collection, consider breeders as a source. They have the lowest rates of aggression among their fish. Have you had success with a betta sorority? Leave us a comment below and let’s chat about it!

📘 Want to learn more? This article is part of our complete Betta Fish Guide. Your ultimate resource for betta care, types, tank setup, feeding, tank mates, and more.
May 29, 2022

15 Best Blue Freshwater Fish: My Picks After 25 Years in the Hobby

Blue freshwater fish are genuinely hard to find. And I say that as someone who’s been searching for them for 25+ years. True blue coloration in freshwater is rare compared to saltwater, so when I see a fish that genuinely delivers on it, I take notice. But “blue” covers a lot of territory in this hobby. The German blue ram and the neon tetra are both blue. They’re not the same kind of fish, and they don’t go in the same kind of tank. This list separates the true-blue species from the blue-adjacent ones, and ranks them honestly by difficulty.

Blue is the rarest true color in freshwater fish. Most of what’s sold as “blue” is iridescent, conditional, or context-dependent.

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After 25 years in freshwater and reef keeping, the fish I see misrepresented most as “easy blue fish” is the German blue ram. Stores market it as a community centerpiece. What they don’t tell you: it needs 80-86°F (27-30°C) water, pristine parameters, and a fully cycled, mature tank. Add the electric blue variant and you’ve raised the difficulty another notch. The blue gourami, on the other hand, is genuinely easy and genuinely blue. If you want blue without the precision requirements, start there. If you want the ram, set up the tank properly first.

True Blue vs. Blue-Adjacent: Know the Difference

Before diving into the list, it helps to understand what you’re actually looking at. True blue fish produce their color structurally, through light interference in specialized cells called iridophores. That color stays consistent across lighting conditions. Blue-adjacent fish show blue as part of a multicolor pattern, or only in specific lighting, or only when actively displaying.

On this list: German blue ram, electric blue ram, electric blue acara, blue gourami, cobalt blue zebra, electric blue johanni, and frontosa are structural blue fish. Neon tetra, cardinal tetra, betta, and guppy are blue-adjacent. Boesemani rainbowfish is a conditional blue, showing best under strong lighting against hard-water backgrounds.

That distinction matters for building a tank around blue coloration.

Quick Comparison Table

Species	Difficulty	Max Size	Min Tank	Key Trait
Blue Gourami	Beginner	5 in (13 cm)	20 gal (75 L)	Hardy, true blue, underrated
Fancy Guppy (blue)	Beginner	2.5 in (6 cm)	10 gal (38 L)	Blue-adjacent, color varies
Neon Tetra	Beginner+	1.25 in (3 cm)	15 gal (57 L) cycled	Needs mature tank, blue-red pattern
Cardinal Tetra	Intermediate	2 in (5 cm)	20 gal (75 L)	More color than neon, softer water
German Blue Ram	Advanced	2.5 in (6 cm)	20 gal (75 L)	Precision fish, 80-86°F required
Electric Blue Ram	Expert	2 in (5 cm)	20 gal (75 L)	GBR but harder, genetically weaker
Cobalt Blue Zebra Cichlid	Intermediate	6 in (15 cm)	55 gal (208 L)	Aggressive mbuna, species-only setup
Blue Peacock Cichlid	Intermediate	7 in (18 cm)	55 gal (208 L)	Calmer than mbunas, best blue display
Boesemani Rainbowfish	Intermediate	4.5 in (11 cm)	55 gal (208 L)	Needs hard water, best color at full size
Frontosa Cichlid	Intermediate	12 in (30 cm)	125 gal (473 L) for group	Slow-moving showpiece, Lake Tanganyika

TIER BREAKDOWN

Beginner: Blue Gourami, Fancy Guppy (blue variant), Blue Betta, Neon Tetra (in a cycled tank), Praecox Rainbowfish, Banggai Cardinalfish
Intermediate: Cardinal Tetra, Blue Peacock Cichlid, Cobalt Blue Zebra, Boesemani Rainbowfish, Frontosa Cichlid, Discus (blue variants)
Advanced/Expert: German Blue Ram, Electric Blue Ram

Key Takeaways

True blue coloration in freshwater is structural and produced by iridophores. It looks different from blue-as-pattern, like neons or bettas.
The German blue ram requires 80-86°F (27-30°C) water, mature chemistry, and experience. It’s not a beginner fish regardless of its size.
The electric blue ram is the same fish with an amplified care difficulty due to inbreeding pressure. Plan for more losses and shorter lifespans if conditions aren’t exact.
The blue gourami is one of the most underrated beginner fish in the hobby. Hardy, true blue, adaptable to a wide range of water conditions.
The cobalt blue zebra cichlid needs a species-appropriate mbuna setup. It’s not a community fish, period.
Boesemani rainbowfish show their best blue coloration in hard, alkaline water. In soft water, the colors wash out significantly.
Neon tetras need a fully cycled, established tank. They’re the most common first casualty when beginners skip the nitrogen cycle.

The 15 Best Blue Freshwater Fish

1. Betta Fish

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Scientific Name: Betta splendens
Difficulty Level: Beginner to Moderate
Adult Size: 2.5 inches (6 cm)
Minimum Tank Size: 10 gallons (38 L)
Temperature: 75-82°F (24-28°C)
pH: 6.5-7.5
Temperament: Males aggressive toward own species; can coexist with peaceful community fish in larger tanks
Diet: Carnivore

Blue bettas are in the blue-adjacent category, meaning the coloration is part of a multicolor display rather than structural blue. That said, a fully blue male betta in a well-lit planted tank is striking. Blue morphs range from turquoise and royal blue to steel and metallic blue, depending on genetics and the individual fish.

What most guides get wrong about bettas: they recommend 5-gallon (19 L) tanks. That’s the minimum survivable space, not the ideal. In a 10-gallon (38 L) or larger, bettas are more active, display more often, and are easier to maintain water quality for. Male bettas go solo or with carefully selected non-aggressive, non-nippy tank mates in tanks 20 gallons (75 L) and up.

2. Fancy Guppies (Blue)

Guppy Fish

An undemanding fish that is a livebearer. Many varieties available

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Scientific Name: Poecilia reticulata
Difficulty Level: Beginner
Adult Size: 1.5-2.5 inches (4-6 cm)
Minimum Tank Size: 10 gallons (38 L)
Temperature: 64-82°F (18-28°C)
pH: 7.0-8.5
Temperament: Peaceful
Diet: Omnivorous

Blue guppies are easy, adaptable, and widely available. The blue coloration shows in the tail and body of males, ranging from sky blue to royal and tuxedo blue. They’re livebearers, so expect fry if you keep males and females together. For best color display, keep 3 females per male to reduce male stress and excessive chasing.

3. Blue Gourami

Scientific Name: Trichopodus trichopterus
Difficulty Level: Beginner
Adult Size: 5 inches (13 cm)
Minimum Tank Size: 20 gallons (75 L)
Temperature: 75-86°F (24-30°C)
pH: 5.5-8.5
Temperament: Semi-aggressive (males competitive)
Diet: Omnivorous

The blue gourami is the most underrated beginner blue fish in the hobby. It’s genuinely blue, not blue-adjacent. Hardy enough to tolerate the parameters swings that would kill a German blue ram. Adaptable to almost any tropical freshwater setup. The opaline and wild three-spot forms show the best blue, especially under warm white lighting.

The catch: males get territorial with each other and with similarly shaped fish. One male per tank unless you’re running a species setup. They’re labyrinth fish, so they breathe surface air. Make sure there’s an air gap between the lid and the water surface.

4. German Blue Ram

Scientific Name: Mikrogeophagus ramirezi
Difficulty Level: Advanced
Adult Size: 2.5 inches (6 cm)
Minimum Tank Size: 20 gallons (75 L) for a pair, mature tank required
Temperature: 80-86°F (27-30°C)
pH: 5.0-7.0
Temperament: Peaceful toward non-cichlids
Diet: Omnivorous

The German blue ram is one of the most beautiful freshwater fish in the hobby. It’s also one of the most misrepresented. Stores sell it as a community fish for beginners. It is not. It requires warm water, 80-86°F (27-30°C), that is genuinely at the top of the tropical range. Most community fish are uncomfortable at those temperatures. It needs pristine water quality and a fully cycled, mature tank with established beneficial bacteria. In new tanks, they crash fast.

When you get the setup right, the reward is one of the most color-saturated small cichlids available. Males display intense blue, yellow, and red simultaneously. They develop real personalities and will recognize their keeper. But the tank has to be right first.

5. Electric Blue Ram

Scientific Name: Mikrogeophagus ramirezi (selectively bred variant)
Difficulty Level: Expert
Adult Size: 2 inches (5 cm)
Minimum Tank Size: 20 gallons (75 L), mature
Temperature: 80-86°F (27-30°C)
pH: 5.0-7.0
Temperament: Peaceful
Diet: Omnivorous

The electric blue ram is the same species as the GBR, selectively bred for an amplified all-over blue color. The tradeoff: the inbreeding required to produce that color also reduces immune function and overall hardiness. Electric blue rams are more sensitive to water changes, more prone to disease, and shorter-lived on average than standard German blue rams. They’re also more expensive, which makes the losses more painful when they happen.

If you want a GBR and have experience with the standard form, the electric blue is an advanced project for a keeper who already knows what the fish requires. If you’ve never kept German blue rams before, start with the standard form first.

6. Blue Peacock Cichlid

Scientific Name: Aulonocara nyassae
Difficulty Level: Intermediate
Adult Size: 7 inches (18 cm)
Minimum Tank Size: 55 gallons (208 L)
Temperature: 76-82°F (24-28°C)
pH: 7.8-8.6
Temperament: Semi-aggressive, calmer than mbunas
Diet: Carnivorous

The blue peacock cichlid is one of the best-looking African cichlids in the hobby. Males show full metallic blue at maturity and during spawning, which is when the color is most intense. They’re calmer than mbuna cichlids, which makes them a better option for mixed African cichlid displays. Run one male per 3-4 females to keep aggression manageable. High pH, alkaline water is non-negotiable for long-term health.

7. Cobalt Blue Zebra Cichlid

Scientific Name: Maylandia callainos
Difficulty Level: Intermediate
Adult Size: 6 inches (15 cm)
Minimum Tank Size: 55 gallons (208 L)
Temperature: 76-82°F (24-28°C)
pH: 7.8-8.6
Temperament: Aggressive mbuna
Diet: Herbivore

The cobalt blue zebra is a solid, intense blue mbuna cichlid from Lake Malawi. It’s also one of the more aggressive fish on this list. This is not a community fish. It’s not a tank mate for peaceful species. It goes in a mbuna-specific setup with other Lake Malawi cichlids that can hold their own. Males are territorial and will chase and injure subordinate fish. Overstocking slightly, a common mbuna technique, helps distribute aggression across multiple targets rather than fixating on one fish.

8. Electric Blue Johanni

Scientific Name: Melanochromis johannii
Difficulty Level: Intermediate
Adult Size: 4-5 inches (10-13 cm)
Minimum Tank Size: 55 gallons (208 L)
Temperature: 73-81°F (23-27°C)
pH: 7.6-8.8
Temperament: Semi-aggressive
Diet: Omnivore

The electric blue johanni is a vivid blue mbuna. Only males show the dark blue coloration; females are golden orange, which makes sex identification easy. Keep with other mbuna species from Lake Malawi. Best in groups of one male with multiple females to prevent male-on-male aggression.

9. Frontosa Cichlid

Scientific Name: Cyphotilapia frontosa
Difficulty Level: Intermediate
Adult Size: 10-14 inches (25-36 cm)
Minimum Tank Size: 125 gallons (473 L) for a group
Temperature: 72-82°F (22-28°C)
pH: 8.0-9.0
Temperament: Semi-aggressive, predatory toward smaller fish
Diet: Carnivore

The frontosa is a Lake Tanganyika cichlid, not Lake Malawi, which means it’s kept differently from the mbunas and peacocks above. Silvery blue with bold black bars and a pronounced nuchal hump that develops with age. Slow-moving, deliberate, impressive. They need to be kept in groups of 6 or more for best behavior, which means a very large tank is the starting point, not an option. They’re predatory toward small fish, so plan the stock list accordingly.

10. Cardinal Tetra

Cardinal Tetra

Looks like the Neon Tetra, but with longer blue and red stripes. Grows larger than a neon tetra as well

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Scientific Name: Paracheirodon axelrodi
Difficulty Level: Intermediate
Adult Size: 2 inches (5 cm)
Minimum Tank Size: 20 gallons (75 L)
Temperature: 73-81°F (23-27°C)
pH: 5.5-7.0
Temperament: Peaceful schooler
Diet: Omnivorous

The cardinal tetra has more red and more blue than the neon, extending the full length of the body rather than stopping at the midsection. The blue iridescent stripe is vivid and consistent. They’re more demanding than neons and prefer soft, slightly acidic water. In a well-planted tank with dark substrate and dim lighting, a school of 12 or more cardinals is genuinely spectacular.

11. Neon Tetra

Neon Tetra

One of the most popular freshwater community schooling fish available in the aquarium trade. Great neon blue colors!

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Scientific Name: Paracheirodon innesi
Difficulty Level: Beginner (in a cycled tank)
Adult Size: 1.25 inches (3 cm)
Minimum Tank Size: 15 gallons (57 L), fully cycled
Temperature: 70-77°F (21-25°C)
pH: 5.0-7.0
Temperament: Peaceful schooler
Diet: Omnivorous

Neon tetras are labeled as beginner fish and sold in new-tank starter kits. That’s what kills them. Neons are sensitive to ammonia and nitrite, the exact conditions that exist in an uncycled or new tank. In a fully established, cycled aquarium with stable parameters, they’re straightforward and long-lived. In a new tank, they’re the first to go. The rule is simple: cycle the tank completely before adding neons. Don’t rush it.

12. Boesemani Rainbowfish

Scientific Name: Melanotaenia boesemani
Difficulty Level: Intermediate
Adult Size: 4.5 inches (11 cm)
Minimum Tank Size: 55 gallons (208 L) for a school
Temperature: 77-86°F (25-30°C)
pH: 7.0-8.0
Temperament: Peaceful, active schooler
Diet: Omnivorous

Boesemani rainbowfish have a striking split coloration: blue-purple in the front half, orange-yellow in the back. The blue is most vivid in hard, alkaline water and in mature males. In soft water, the colors wash out and become muddy. If your tap water is soft, you’ll need to harden it before adding these fish. They also need to reach full size to show their best color, which means patience. Juveniles are pale and underwhelming. Adults in good water are genuinely impressive.

13. Praecox Rainbowfish (Dwarf Neon Rainbowfish)

Dwarf Neon Rainbowfish

A colorful rainbowfish that only grows up to 3 inches in length. Best in groups of 8 to 10

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Scientific Name: Melanotaenia praecox
Difficulty Level: Beginner to Intermediate
Adult Size: 3 inches (7.5 cm)
Minimum Tank Size: 20 gallons (75 L)
Temperature: 73-82°F (23-28°C)
pH: 6.8-7.5
Temperament: Peaceful, active
Diet: Omnivorous

The praecox rainbowfish is the easier, smaller alternative to the boesemani. Blue body, red fins. They show color well in neutral to slightly hard water, unlike the boesemani which demands hard water. Active schoolers that do best in groups of 8 or more. Excellent for community tanks that need movement and color at the mid-level.

14. Discus Fish (Blue Variants)

Scientific Name: Symphysodon aequifasciata
Difficulty Level: Advanced
Adult Size: 8-9 inches (20-23 cm)
Minimum Tank Size: 75 gallons (284 L) for a group
Temperature: 82-86°F (28-30°C)
pH: 6.0-7.5
Temperament: Peaceful
Diet: Omnivorous, prefers meaty foods

Blue discus varieties, including cobalt blue, blue diamond, and blue snakeskin, are among the most visually stunning freshwater fish available. They’re also advanced-level. They need very warm water, mature tank chemistry, large group sizes for psychological stability, and frequent water changes. They share many care requirements with the German blue ram, but at a much larger scale and price point.

15. Electric Blue Crayfish

Scientific Name: Procambarus alleni
Difficulty Level: Beginner to Intermediate
Adult Size: 4-6 inches (10-15 cm)
Minimum Tank Size: 30 gallons (113 L)
Temperature: 65-75°F (18-24°C)
pH: 6.5-7.5
Temperament: Semi-aggressive, opportunistic predator
Diet: Omnivorous

Not a fish, but genuinely electric blue and worth including. These freshwater crayfish from Florida and the southeastern US are among the most vivid blue animals in freshwater aquariums. They eat plants and will catch slow-moving fish if given the opportunity. Fast-moving tank mates like danios reduce the risk. Skip planted tanks; these crayfish will dismantle them systematically.

What People Get Wrong About Blue Freshwater Fish

The most common mistake: confusing the German blue ram’s marketing description with its actual care level. Every store chain sells it as a community fish. It’s not. It needs high temperature, pristine water, and a cycled tank. In a brand-new 10-gallon (38 L) setup, it will die quickly.

Second most common: buying neon tetras the same day as the tank. Neons are sensitive to the ammonia spikes in new tanks. The nitrogen cycle takes 4-6 weeks minimum. Skip the neons until the tank is established.

Third: assuming all blue cichlids are the same. Cobalt blue zebras are aggressive mbunas that need a species-specific mbuna setup. Blue peacocks are much calmer and work in mixed African cichlid displays. Don’t mix the two approaches without researching the specific species first.

AVOID IF

You want a German blue ram or electric blue ram and your tank is less than 3 months old. You have a standard tropical tank at 76°F (24°C) and are expecting full color from a GBR. You want a cobalt blue zebra cichlid in a community tank with peaceful species. You have soft, acidic water and want boesemani rainbowfish without a plan to harden it. You’ve never kept cichlids before and want to start with electric blue rams.

MARK’S PICK

For beginner blue fish: the blue gourami. Hardy, genuinely blue, works in almost any tropical setup. For intermediate blue: the blue peacock cichlid in a proper African cichlid display. The color is excellent and the care is manageable once you understand African cichlid chemistry. For the showpiece blue fish with experience behind you: the German blue ram in a dedicated warm-water planted setup. It’s worth the effort when you get the conditions right.

Should You Get a Blue Freshwater Fish?

Good fit if:

You want an easy community fish with genuine blue coloration (blue gourami, guppy, praecox rainbowfish)
You have an established African cichlid tank and want a blue centerpiece male (peacock cichlid)
You have a warm, mature planted tank set up at 82°F (28°C) and want a stunning small cichlid (German blue ram)
You want blue in a school and have a cycled tank (neon tetra, cardinal tetra)

Avoid if:

Your tank is new and uncycled and you want neon tetras
Your water is soft and acidic and you want boesemani rainbowfish without adjusting it
You’ve never kept cichlids and want to start with electric blue rams
You want blue fish for a general community tank and are eyeing cobalt blue zebra cichlids

Where to Buy

For guppies, gouramis, neons, and praecox rainbowfish, most local fish stores carry consistent stock. For German blue rams, electric blue rams, boesemani rainbowfish, and African cichlid species, online specialty retailers offer better selection and healthier stock.

Flip Aquatics carries quality freshwater species with strong stock health. Dan’s Fish is another reliable source for specialty species that are harder to find locally.

FAQ

Is the German blue ram really that hard to keep?

Yes. It needs 80-86°F (27-30°C) water, which is at the top of the tropical range and incompatible with most community fish. It also needs pristine water chemistry and a mature, cycled tank. It’s sold as an intermediate fish but the failure rate among beginners is high. Build the setup first, then add the fish.

What is the easiest true-blue freshwater fish?

The blue gourami. It’s genuinely blue, not just blue-adjacent, and it’s tolerant of a wide range of water parameters. Hardy, adaptable, and available at most fish stores. It’s the blue fish most commonly overlooked in favor of harder species.

Can I keep neon tetras in a new tank?

No. Neon tetras are sensitive to ammonia and nitrite, which are elevated in new, uncycled tanks. Cycle the tank fully, which takes 4-6 weeks, before adding neons. In an established tank with stable parameters, they’re easy to keep long-term.

Why aren’t my boesemani rainbowfish showing good blue color?

Two likely reasons: the water is too soft, or the fish aren’t fully mature yet. Boesemani rainbowfish need hard, alkaline water to express their full color range. In soft water, the blue-purple fades significantly. Juveniles are also naturally pale; full color develops at adult size.

What is the difference between the German blue ram and electric blue ram?

Same species, different genetics. The electric blue ram is selectively bred for amplified all-over blue coloration. That selective breeding also reduces immune function and overall hardiness compared to the standard form. Electric blue rams are harder to keep, more expensive, and shorter-lived on average. Start with the standard German blue ram before attempting the electric blue variant.

Closing Thoughts

Blue freshwater fish require more planning than most hobbyists expect. The easy blue options, blue gourami, guppy, praecox rainbowfish, are genuinely accessible. The precision blue options, German blue ram, electric blue ram, and the African cichlid species, require specific setup conditions that have to be right before the fish goes in the tank.

Don’t build the tank around what looks good at the store. Build it around what you can actually maintain, then choose the blue fish that fits that setup. A thriving school of cardinal tetras in a mature planted tank is more impressive than a German blue ram that crashed in a new aquarium.

Looking to add a blue freshwater fish to your tank? Check out Flip Aquatics for healthy, quality stock, or browse Dan’s Fish for specialty species that are harder to find locally.

May 20, 2022

Ram Cichlid: Complete Care Guide (Care, Tank Mates, and Breeding)

The Reality of Keeping Ram Cichlid

Let me be honest with you. Rams are one of the most returned fish in the aquarium trade. They are stunning, and that is what sells them. But beauty does not equal easy.

Three colors, one fragile fish.

They need warm, soft, acidic water. Rams need temperatures between 82 and 86F with a pH under 7.0 and very low hardness. If your tap water is hard and alkaline, you are fighting an uphill battle from day one. Trying to keep rams in water with a pH of 7.8 is a recipe for stress and disease.

They are fragile when stressed. Rams have almost zero tolerance for ammonia or nitrite. Even a small spike that other fish would shrug off will kill a ram. Your tank needs to be fully cycled and stable for weeks before you add these fish.

Breeding stock quality varies wildly. Most rams in pet stores come from mass breeding operations in Asia where they are pumped full of hormones and antibiotics. These fish look incredible in the store but often crash within days of being brought home. Buying from a reputable breeder costs more but dramatically improves your odds.

They are not community fish in the traditional sense. Rams need peaceful, slow-moving tank mates that will not outcompete them for food or stress them with aggression. Fast, nippy fish like tiger barbs will make a ram’s life miserable.

Biggest Mistake New Ram Cichlid Owners Make

Putting them in an uncycled or newly cycled tank. Rams need a mature, stable ecosystem. If your tank has been running less than two months, it is not ready for rams. Period.

Expert Take (Mark Valderrama, AquariumStoreDepot)

Buy from a breeder, not a chain store. Start with a proven pair if you want to breed. Keep the temperature at 84F and never let it drop below 80F. These three things alone will double your success rate with rams.

ASD Difficulty Rating: Tier 2 – Intermediate

German blue rams require stable temperatures of 78-84 degrees F (26-29 degrees C), soft acidic water, and a mature tank. They are sensitive to ammonia, nitrite, and elevated nitrates. Not for beginners or new tanks.

Brief Overview of the Ram Cichlid
Classification
Ram Cichlids Appearance
How Big Are They?
How Long Do They Live?
Temperament and Activity Level
Tank Mates
Aquarium Requirements
Breeding
What do They Eat?
Diseases
Different Types
3 Main Sources
FAQs
Final Thoughts

Ram cichlids are beautiful, delicate, and unforgiving. They need pristine water, elevated temperatures, and rock solid stability. One parameter swing and they stop eating. Two and they are dead. I have watched experienced keepers lose rams because they treated them like any other dwarf cichlid. They are not. Rams demand precision, and they punish anything less. All commercially bred ram variants are weakened by hormone treatments and inbreeding. That makes them the most frequently killed dwarf cichlid by new keepers.

What Most Care Guides Get Wrong About Ram Cichlid

The number one mistake I see with ram cichlids is people treating them like any other hardy tropical fish. They’re not. Rams are sensitive to water quality in ways that most beginner fish aren’t, and they absolutely need warm water. 80°F minimum, ideally 82-84°F. I’ve seen countless rams die within weeks of purchase because they were kept at 76-78°F in a standard community tank. The other common misconception is lumping all ram varieties together. German blue rams, Bolivian rams, and electric blue rams have meaningfully different care requirements, especially regarding temperature tolerance and hardiness.

German blue rams are one of the most visually stunning dwarf cichlids you can keep. And one of the most frequently killed by hobbyists who underestimate their water chemistry requirements. I’ve kept rams over the years and the pattern I see is always the same: someone buys them because they look incredible in the store, puts them in a standard community tank at 76°F, and loses them within a few weeks. Rams want warm, soft, slightly acidic water. 82 to 86°F is the sweet spot. Get that right, along with stable parameters, and they’re genuinely rewarding fish with real personality. This guide covers everything: care, compatible tank mates, and what it actually takes to breed them.

The Ram or dwarf Cichlid is a stunning and tranquil freshwater fish species that have been observed for over 30 years. They go by many names, Ramirez’s dwarf cichlid, Blue ram, Butterfly ram, Ram ramirezi, and Dwarf cichlid. All these names lead to one beautiful fish species, belonging to the family Cichlidae and originating in South America, mostly in Amazon and Orinoco river extensions.

Brief Overview of the Ram Cichlid

Scientific Name	Mikrogeophagus ramirezi
Common Names	Ram Cichlid, blue ram, German blue ram, Asian ram, butterfly cichlid, Ramirez’s dwarf cichlid, dwarf butterfly cichlid, and Ramirezi
Family	Cichlidae
Origin	South America
Diet	Omnivore
Care Level	Moderate-Advanced
Activity	Moderate
Lifespan	3 – 4 years
Temperament	Peaceful
Tank Level	Mid to bottom
Minimum Tank Size	30 gallons
Temperature Range	75 ° to 82 °F
Water Hardness	6-14 d GH
pH Range	5.0 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	Cichliformes
Family	Cichlidae
Subfamily	Geophaginae
Genus	Mikrogeophagus
Species	M. Ramirezi (Myers & Harry, 1948)

Ram Cichlids Appearance

Ram cichlid are small dwarf cichlids with large fins that overshadow their oval-shaped bodies.

Ram cichlid has vibrant reddish-orange, red and yellow spots all over their body with bright red eyes and a black band running through them. Due to their unique coloration and outstanding patterns, they make a great addition to your community aquarium.

In ram cichlids, the male rams are larger in length and possess the biggest dorsal fin. Because of their flowy dorsal fins and colorful appearance, they are commonly called butterfly cichlids.

How Big Are They?

Ram cichlids fall under the dwarf cichlids category. Therefore, they can never grow larger than 2-3 inches in captivity. However, in the wild, Ram cichlids are known to reach a maximum of 7 to 8 inches in length.

How Long Do They Live?

In captivity, the ram cichlid lives for up to 4 or 5 years. Even though hardy creatures, ram cichlids demand extreme care and a properly cleaned tank. Otherwise, they can develop deadly diseases such as fish tuberculosis. If ram cichlids are not provided with ample care and maintenance, they can also die of stress.

The lifespan of Ram cichlids depends on many factors such as water quality, diet, water parameters and temperature, pH and water hardness, and above all, the overall health.

Temperament and Activity Level

Ram cichlids are community tank fish with a peaceful nature. However, some types such as Bolivian rams can get semi-aggressive and territorial, when they feel their territories are being invaded.

Ram cichlids are average swimmers and quick at hiding in their favorite spots to catch prey to eat. Therefore, an aquarium should be well-planted with lots of aquatic plants and hiding places such as driftwood, caves, rocks, etc.

Tank Mates

No matter how agile and peaceful Ram cichlids are, you cannot keep them with any other fish. Here are the 15 most suitable tank mates for your ram cichlid.

Aquarium Requirements

Ram cichlids are very particular about their living environment. If the fish tank doesn’t meet all the requirements, ram cichlid can go into stress and eventually die. Therefore, it is imperative to take preventive measures and provide them with optimal conditions.

Tank Size

Even though ram cichlids are dwarf cichlids, they require plenty of swimming space. Therefore, go for a tank that is at least 20 gallons or more. It also depends on the number of fish you want to keep. If you’re aiming for more than one male, opt for a 29-gallon tank. One other reason to keep them in a large aquarium is they are highly sensitive to nitrates and prefer a gentle flow. So, more water and a larger tank ensure the maximum health of your rams.

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Not just that, they appreciate regular water changes, and so I recommend installing a premium quality canister filter to raise a healthy ram cichlid.

Water Parameters

One thing I can safely say about these cichlids is they don’t need a chiller, but a heater would suffice their needs.

Ram cichlids are tropical fish that thrive in warm water temperatures of around 78 to 85 °F. Therefore, I recommend installing a high-quality heater to provide them with the optimal temperature. Also, your rams will live happily if you create a natural environment for them. For this, fish experts suggest putting a fine substrate and plenty of plants with lots of hiding places in the form of rocks and caves for hiding or breeding.

Tank Setup

A ram cichlid is very susceptible to certain chemicals and rapid changes in its environment. All these rapid changes and traces of chemicals can cause piscine (fish tuberculosis) which is fatal and inevitable if water quality is ignored.

As far as the lighting is concerned, a ram cichlid prefers dim lights. If you have plants, I recommend using adjustable LED lights, low light plants, or getting floating plants to provide them with suitable shade without affecting your plants.

Since ram cichlid are sensitive, make sure to check the levels of ammonia and nitrates in their tank and change the water weekly to ensure quality.

Breeding

To ensure the successful breeding of ram cichlid in their breeding season, make sure to provide soft water conditions by adding a small bag of rinsed peat to your canister filter. Also, make sure to keep the water pH neutral within recommended temperature range as ideal water conditions increase their activity level and improve the chances of breeding.

In the natural habitat, a ram cichlid is a known open spawner, which means they create family groups and lay around 150 to 200 eggs approx.

Adult rams are difficult to pair with and costly as well. The cheaper and more effective way is to get juveniles and let them grow and pair together. Since they are monogamous pairs, I recommend keeping the breeding pair in a separate breeding tank for spawning.

Additionally, make sure to keep the water warmer in the breeding tank by around 2 to 3°F and more acidic with a slow water flow.

You can also feed the breeding pair with live food, such as blood worms, white worms, and brine shrimp as a treat once a day.

The Birth Process

Before keeping ram or dwarf cichlid, be informed that they do not lay eggs at all, if they are stressed during breeding. Rams only lay eggs when they are relaxed and devoid of other distractions. When their females are pregnant, their pink bellies become visibly fat and a female blue ram cichlid lay eggs under large, flat rocks and demands complete solitude. Hence, you need to to keep the pregnant female in a separate tank, no matter how peaceful they are.

Your tank setup and parameters should also be adjusted according to the liking of your breeding pair. The water should be of a neutral pH to slightly higher for optimal breeding and the temperature should be raised than the usual temperature which is around 77°F and 82°F. The warmer temperatures increase activity and improve the chances of successful breeding.

In cichlids, both mother and father fish raise the fry, which is unique for freshwater fish species. The fry rests in father ram’s mouth if they sense any potential danger and you should pay special attention to the fry because they is swept into the filter.

What do They Eat?

Feeding rams with high-quality food that is rich in protein is quintessential for successful breeding and raising healthy, happy rams.

Since ram cichlid is omnivorous, it relies on plants and meat. In their natural habitat, they feed on floating plants and small insects, larvae, and other invertebrates.

However, seasoned aquarists recommend feeding them brine shrimp, earthworms, artemia, blood worms, tubifex, white worms, and cyclopeeze. But bear in mind that the live food should be free of contaminants like bacteria, fungus, etc to avoid diseases and other health-related issues.

I don’t recommend pellets and flakes on a daily. However, if you’re feeding them commercial food, make sure it sinks as butterfly cichlids are not surface dwellers. Also, incorporate plants and vegetables in their diet and feed them two to five small portions of meals several times a week. This also helps preserve the quality of water.

If your butterfly cichlid is new to the tank, it will be timid at the feeding time and may completely refuse to eat as they settle in its new fish tank. To cater to this, isolate the fish and feed them with treats such as mosquito larvae and start establishing their regular diet.

Diseases

Like most fish, rams are also vulnerable to tropical fish diseases, especially to poor water quality and stress that weakens their immune system.

One common disease in ram cichlids is ich, which is treated by increasing the water temperature to 86ºF for three days.

The butterfly cichlids are also susceptible to:

Parasitic infestations
Bacterial infections
Fungal infections
Tuberculosis
In addition to these, these fish species can also develop Costia diseases, flatworm, and tapeworm infestations.

Different Types

Among the plethora of strains of Ram cichlids, there are four common types that aquarists love.

German Blue Rams

German blue ram cichlids are very popular among the aquarists because they are not only beautiful but docile and peaceful community tank fish. Like other ram cichlids, German blue rams are bred in captivity and are small fish around 2.5 inches with a calm personality.

German blue rams originate from the river basins of Orinoco, in the savannas of Venezuela, Colorado, and South America. The main body of a German blue ram cichlid is divided into three prominent colors mainly orange, gold, and turquoise blue. Additionally, there’s a black striped line on their face that covers their vivid orange eyes. The fins of German blue rams have blue mottling and a black dot on their midriff.

German blue rams live with other community tank fishes peacefully. However, they are territorial and aggressive fish, especially when other fish try to invade their territories. However, German blue rams are known to be good parents that do not abandon their fry hatch.

Bolivian

Bolivian Ram cichlids are the largest of all ram cichlids that can reach up to inches in length. They are also available in the wild.

They originate from the Amazon river basins, especially in Brazil and Bolivia. Hence, the name. They are found in slow-moving streams, rivers, lakes, and pools with densely populated vegetation that protects them from predators and provides them with food.

Bolivian rams demand larger tanks of no less than 30 gallons and the tank size is crucial to the health of this fish. They also love densely planted aquariums with an appropriate substrate so they can continue their regular foraging activities.

The bodies of Bolivian ram cichlids have a simple base, mainly yellow or golden. However, the most prominent feature of these ram cichlids is the red highlights along with their fins. Due to this, they are also known as the red ram cichlid.

Bolivian rams are popularly known for their sifting behavior as they love sifting through the substrate for food. The recommended diet of these ram cichlids should contain pellets, flakes, chopped brine shrimp, blood worms, earthworms, and other protein content. Seasoned aquarists discourage feeding them live food as it will contaminate the water and spread fatal infections.

Fun Fact: The scientific name of Bolivian Ram Cichlid is not Mikrogeophagus ramirezi, as it is a different species, known as Mikrogeophagus altispinosus.

Golden Ram Cichlids

Like German blue ram, gold rams are also dwarf cichlids that reach a maximum of 2.5 inches overall with a light golden body and electric blue mottling on the fin. The dorsal fin of gold rams is spiky and they have pale eyes with a black pupil. Out of the four ram cichlids, golden rams are the lesser known and like Bolivian Rams, they are also found in a natural habitat.

The Golden Ram cichlid originates from the Rio Orinoco drainage within Venezuela and Colombia and they are found in pairs.

Like most cichlid species, the golden ram is a wonderful, colorful, and peaceful fish that is suitable for a community aquarium. However, it becomes territorial sometimes. They require a lot of swimming space in a fish tank with ample plantations and hiding places. They are omnivorous, so should be fed a decent diet balanced with protein and occasional treats of live food.

Electric Blue

Electric blue rams (video source) are so much like their wild-caught cousins, but the differences lie in their coloration. The electric blue ram cichlids are radiant-blue in color with red patches around their body. Their eyes are orangish yellow along the forehead and that’s the most beautiful feature of electric blue rams.

The electric blue ram cichlids are popular in the aquarium trade since 2009 with their ovoid body and long spiky fins like blue rams. Unlike other dwarf cichlids, the electric blue rams are not suitable for beginners as they are more sensitive than other cichlid species.

Also, an electric blue ram is a very shy fish that hides in caves, rocks, or other hiding places when they feel bullied or threatened.

3 Main Sources

If you want a Ram fish for your aquarium, you can source it from:

Local breeders or tradeshows
Overseas fish farms
Domestic fish farms (from your own country; from Florida)

There are many fish stores that sell Ram cichlid. However, these cichlids will most likely be imported from overseas. Imported cichlids will appear brighter with longer fins, but sometimes, they are artificially boosted by several hormones to enhance their vibrancy and overall appearance. However, the use of such hormones may adversely affect the life span of your cichlids.

If you wish to get a Ram Cichlid from domestic farms, be informed that they are mostly bred in Florida. It is better to get your Ram cichlids from domestic farms than an overseas farm, as they are in a much better condition.

But I recommend getting your aquarium buddies from a local breeder since they are kept in water conditions and environments similar to yours. Hence, they live and thrive in your home aquariums.

How to Pick a Healthy Fish?

So, you’ve made a decision to bring home a Ram cichlid? Great. But you should know how to pick a healthy one to avoid hazards.

Select a healthy-looking, active ram cichlid that eats and swims well
Pick the ones that compete with other rams for a great spawning site
Avoid choosing skinny or shrunken rams with a hollow belly

If you’re looking for a breeding pair, aquarium breeders suggest getting a colorful make with extended dorsal fins and great pectoral fins. And if you find the female already paired with the male ram cichlid, get them; as there are higher chances of successful breeding.

How to Distinguish between Male and Female?

To distinguish between a male and female ram cichlid, always remember:

Females have tiny, bright blue dots inside their black spots on the sides of their bodies
Males lack these dots on their black spots.

FAQs

How Many Should Be Kept Together?

Ram cichlids require a large tank for free swimming space, easy feeding, and successful breeding. Therefore, a pair of ram fish can be kept in a 20- gallon community tank or an in a 10- gallon breeding rank with no other tank mates.

You can add multiple rams in a community tank but you have to increase the aquarium size according to the number of pairs. For example, a 40-gallon tank should accommodate 2 pairs of rams.

What Do They Eat?

Blue rams are omnivorous so they prefer a mix of both; leafy plant and meaty proteins. Seasoned aquarists recommend feeding them brine shrimp, earthworms, artemia, blood worms, tubifex, white worms, and cyclopeeze. But bear in mind that the live food should be free of contaminants like bacteria, fungus, etc to avoid diseases and other health-related issues.

Can I Keep A Single One?

Rams are community tank fish and thrive well with other like-minded tank mates, but you can keep a single ram cichlid as long as you provide them with ample space, nutritious food, and lots of hiding places to forage and play.

How Big Do They Get?

Ram cichlids fall under the dwarf category so they don’t get beyond 2-3 inches in captivity.

Can You Mix Them Together?

Yes, you can. However, please understand the needs of different cichlid types before mixing them together. Rams prefer warmer water temperatures that don’t go well with other fish. Also, choose a larger community tank of over 40 gallons to house multiple rams together.

How Long Do T hey live?

In captivity, the ram cichlid lives for up to 4 or 5 years. However, the lifespan of German blue rams highly depends on various factors, such as water quality, diet, water parameters and temperature, pH and water hardness, and above all, overall health.

Is the Ram Cichlid Right for You?

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

Ideal if you want a stunning dwarf cichlid centerpiece. Few freshwater fish match the color and personality of a healthy ram cichlid.
Not recommended for brand-new fishkeepers. Their sensitivity to water quality and temperature makes them a poor first fish.
Great for planted tanks. Rams thrive in well-planted setups and won’t destroy your plants like larger cichlids will.
Skip if you can’t maintain stable warm temperatures. If your tank regularly drops below 80°F, rams will struggle and eventually get sick.
Good for experienced community keepers. They work well with small tetras, corydoras, and other peaceful species in a warm tank.
Consider a Bolivian ram instead if you want something hardier. Bolivians tolerate cooler water and wider parameters while offering similar personality.

What It Is Actually Like Living With Ram Cichlid

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

They are surprisingly interactive. Rams will learn your feeding schedule and come to the front glass when they see you. They pick through substrate constantly, rearrange small decorations, and display for each other throughout the day.

Breeding behavior takes over the tank. When a pair bonds and starts breeding, they become intensely territorial and will chase everything away from their chosen spawning site. A peaceful tank becomes a war zone overnight.

They color up dramatically under the right conditions. A ram in a bare, stressed-out pet store tank looks nothing like a ram in a planted, warm, dimly lit aquarium. The transformation is one of the most dramatic in freshwater fishkeeping.

They have a hierarchy. In groups, rams establish a clear pecking order. The dominant pair gets the best territory, and subordinates get pushed to the edges. You need enough space and hiding spots to make this work.

How the Ram Cichlid Compares to Similar Species

The most common comparison is between the ram cichlid (German blue ram) and the Bolivian ram. Having kept both extensively, I can tell you they’re different fish in almost every way that matters for daily care. German blue rams need water at 82-84°F, soft and acidic conditions, and pristine water quality. Bolivian rams are comfortable at 72-79°F, tolerate a wider pH range, and forgive the occasional missed water change. If you’re newer to fishkeeping or run a cooler community tank, the Bolivian ram is the smarter choice. German blue rams are more colorful, but that beauty comes with a higher maintenance cost.

The apistogramma genus is the other natural comparison for anyone shopping dwarf cichlids. Apistos offer incredible variety. There are hundreds of species and color forms. And many are hardier than German blue rams. They are more territorial during breeding but less demanding on temperature. If you want a dwarf cichlid that gives you breeding behavior and personality without the temperature sensitivity of a German blue ram, a hardy apisto species like A. Cacatuoides is worth considering.

Final Thoughts

Rams do not give second chances. Your tank is either perfect or they die.

Ram cichlids are very small fish around 2-3 inches in length. Despite their size, they require immaculate attention and care. Therefore, make sure to provide at least 20 gallons tank with lots of hiding places and aquatic plants to raise healthy and happy rams.

South American Cichlid Species Directory

This article is part of our South American Cichlids: Complete A-Z Species Directory. Visit the hub page to explore care guides for all 32 South American cichlid species we cover.

May 16, 2022

Chili Rasbora: Complete Care Guide for the Hobby’s Most Striking Nano Fish

Hard Rule

Chili rasboras cannot share a tank with fish larger than 1 inch (2.5 cm). At their tiny adult size, even neon tetras can stress or eat them. Keep them in a dedicated nano setup with shrimp or other micro fish only.

Chili rasboras are one of the most beautiful nano fish you can keep. But in the wrong setup, they disappear completely and never show their true color. I have seen people buy a school of 12, add them to a bright, bare tank, and wonder why they never see them. The fish are there. They are just hiding, stressed, and washed out. Build the right tank and chili rasboras are breathtaking. Skip the setup work and you have invisible fish you paid premium prices for.

Do not add chili rasboras to a tank that has been running for less than three months. They need mature water. Period.

Why Chili Rasboras Do Not Look Good in Most Tanks

Most people who buy chili rasboras never see the fish at their best. The problem is almost always the setup, not the fish.

Too few fish. Keep fewer than 10 and they hide constantly. Their confidence comes from numbers. A school of 6 looks terrible. A school of 15 transforms the tank.

Too much light. Bright lighting washes out their red. They look best under moderate or diffused light with a dark substrate underneath.

Not enough plants. Without dense planting they have nowhere to feel safe. They retreat to corners and you never see their natural swimming behavior.

Wrong tank mates. Anything bigger than 2 inches makes them nervous. They need dedicated nano setups or very carefully chosen companions.

Chili rasboras do not stand out. They come alive when the tank is built around them.

What Most Care Guides Get Wrong About Chili Rasbora

The most common mistake I see with chili rasboras 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. Chili Rasboras 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, chili rasboras are adaptable. But “adaptable” doesn’t mean they’ll thrive in just anything. In my experience, keeping them closer to their natural soft, slightly acidic conditions brings out the best color and longevity.

Expert Take

Never keep chili rasboras in groups smaller than 10. The commonly recommended minimum of 6 is not enough. In my experience, 10 is where they start acting like chili rasboras instead of acting like scared fish hiding behind a filter.

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

Chili rasboras (Boraras brigittae) are tiny (0.7 inches/1.8 cm) micro fish that need established, mature tanks and calm nano tank mates. Their small size makes them incompatible with most community fish.

Species Overview

Scientific Name	Boraras brigittae
Common Names	Chili rasbora, Mosquito rasbora
Family	Cyprinidae
Origin	Borneo, Southeast Asia
Diet	Carnivorous
Care Level	Moderate
Activity	Active
Lifespan	up to 8 years
Temperament	Peaceful
Tank Level	Midwater
Minimum Tank Size	5 gallons (10G recommended!)
Temperature Range	70 ° to 82 °F
Water Hardness	3 to 12 dkH
pH Range	4 to 7
Filtration/Water Flow	Low
Water Type	Freshwater
Breeding	Egg layer
Difficulty to Breed	Moderate
Compatibility	Community tanks
OK, for Planted Tanks?	Yes

Classification

Kingdom	Animalia
Phylum	Chordata
Class	Actinopterygii
Order	Cypriniformes
Family	Cyprinidae
Genus	Boraras
Species	B. Brigittae (Vogt, 1978)

Origins and Habitat

Chili rasboras are native to Borneo in Southeast Asia. Their natural habitat consists of pools in blackwater streams with extremely soft, and quite acidic water.

The water is often full of aquatic and floating plants and partially shaded by the forest trees above. Plenty of leaf litter accumulates in the water and stains it a dark color, creating quite a dim environment.

The chili rasbora (Boraras brigittae) is the most popular of a few closely related Boraras species. If the word ‘boraras’ sounds a little fishy, that’s because it’s an anagram of the word r-a-s-b-o-r-a. Who says fish scientists aren’t fun?

What Do They Look Like?

The chili rasbora (Boraras brigittae) is a tiny nano fish with bold looks. The first impression when seeing this species is a very small, reddish fish with bold markings and huge eyes.

The males have deeper color but are smaller and more slender than the females, which also have rounder bellies. Dominant male chili rasboras become especially colorful, turning a deep red shade.

There is a characteristic black stripe on the sides of the fish’s body which can shine blueish green in good light. Just above this black stripe, you’ll notice a bright red or orange line.

Another stand-out feature is the red patch on the fish’s gill plate. This makes these nano schooling fish look like they have rosy cheeks!

To top it off, chili rasboras have great-looking fins. The base of their tail, and their dorsal and anal fins also have black and orange spots and markings.

How Big Are They?

If you thought something like a neon tetra or a guppy was small, just wait until you meet the chili rasbora! Chili rasboras are one of the smallest fish in the hobby, maxing out at less than an inch in total length.

In fact, a full-grown adult will only reach about 0.8 inches with good care. The male chili rasbora is slightly smaller and slimmer in build than the female.

How Long Do They Live?

Chili rasboras have a surprisingly long lifespan for such a small fish. In the right conditions, these hardy fish can live for up to 8 years!

To keep your fish living longer, make sure you provide them with a healthy and varied diet, a comfortable tank setup, and perform regular maintenance to keep your water quality pristine.

Temperament And Activity Level

The chili rasbora is a pretty outgoing and confident little fish if kept in the right kind of tank setup. With larger fish as tank mates, however, chili rasboras are timid.

They spend most of their time up around the middle and top levels of the aquarium, but they show up just about anywhere too. The chili rasbora is known as a schooling fish and they are very social, although they do not always group tightly.

Chili rasboras are very peaceful fish, so you don’t need to worry about them picking on any other fish in a community tank.

What Are Good Tank Mates?

The chili rasbora is a tiny fish, which can make choosing suitable tank mates a little challenging. Many fish keepers prefer to keep chili rasboras in species-only aquariums because they work so great in schools in nano tanks.

These fish will get along with most other peaceful fish, however, as long as they are not big enough to eat your rasboras.

Read on to learn more about the best (and worst) tank mates for chili rasboras.

Best Tank Mates

The best tank mates for chili rasboras are other peaceful nano fish. Let’s take a look at some of the best tank mates for these amazing fish:

Least Compatible Fish

Chili rasboras are so small that many of the most popular tropical aquarium fish will likely swallow them whole. As a general rule, avoid keeping them, with anything over about 2.5 inches long.

You’ll also want to avoid any predatory fish, aggressive fin-nippers, and boisterous species that could outcompete them for food.

Here are a few common aquarium fish that will not make good tank mates for chili rasboras:

Cichlids, except for rams
Most catfish
Angelfish
Goldfish
Golden wonder killifish
Tiger barbs
Oscars

Inverts

The chili rasbora is one of the safest fish to keep with dwarf shrimp. That being said, they are micro-predators so they will feed on tiny baby shrimp that have just hatched. If you plan on breeding your shrimp, a shrimp-only setup would be wiser.

Here are some shrimp that you can keep with the chili rasbora:

You can also keep snails with your chili rasboras. Snails do a terrific job of keeping an aquarium clean, but some species can really multiply fast. Nerite snails are a great choice because they look amazing, eliminate algae, and best of all, they won’t breed in your fish tank!

What Do They Eat?

The Chili rasbora is a micro predator that feeds on tiny insects and bugs. The name mosquito rasbora is probably a good clue as to what these tiny fish love to feed on in nature.

Think small when looking for food for these fish. They will do great on a diet of fish flakes and nano pellets, but supplementing with live/frozen foods will bring out the best condition and color in these nano fish. A good micro pellet formula is Xtreme Aquatics Foods Nano.

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Let’s take a look at some of the types of food you can feed the chili rasbora:

Prepared Foods

Crushed flakes
Micro pellets

Live & Frozen Foods

Daphnia
Tubifex
Chopped bloodworms
White worms
Micro worms
Mosquito larvae
Baby brine shrimp

How Much And How Often To Feed Your Fish

Chili rasboras need to be fed regularly, at least once a day. It is better to feed these tiny fish small amounts two or three times a day, however.

The chili rasbora is often kept in nano tanks as small as 5 gallons, but this makes overfeeding especially dangerous. A bunch of uneaten food in such a small volume of water can cause dangerous ammonia spikes.

So how do you know how much to feed your fish?

When you go to feed your chili rasboras, watch them eat- they should finish all the food in just a minute or two. Feeding them this amount 2 or 3 times a day is a great way to keep your fish well-fed, without creating too much waste.

Setting Up Your Fish Tank

The chili rasbora (Boraras brigittae) is right at home in a nano tank. They do best in a planted tank with a dark substrate and low water flow. Chili rasboras love live plants, and floating types are a great choice.

Read on to learn more about how to set up a great chili rasbora tank!

Tank Size

The chili rasbora is one of the smallest freshwater fish in the aquarium trade, so they make a great choice for fish keepers who don’t have a lot of space.

A small group of these nano fish can thrive in tanks as small as 5 gallons. This would be the minimum tank size, however, and if you’re new to fish keeping, I’d recommend a larger tank like a 10 or 15-gallon.

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Remember, the smaller an aquarium, the faster things can go wrong, so go slightly bigger to be on the safe side. A ten-gallon tank, for example, will be easier to maintain and allow you to keep an awesome little school of about 20 of these fish quite safely.

Plants

Chili rasboras do really well in a planted aquarium. Not only will your fish feel more at home between the leaves and roots, but live plants also have a number of great benefits when it comes to maintaining the high water quality these fish need.

If you’re not already a planted tank enthusiast, consider picking up some common and easy to grow species like:

These aquarium plants don’t need much maintenance and they won’t take over your tank too fast. Down the road you can look at improving your lighting, picking up some aquascaping tools, and investing in a CO2 injection system. I must warn you though, that the planted aquarium hobby can be addictive!

Go ahead and browse through some of the great plant care articles on this website to learn more about specific species and their care.

Substrate

Chili rasboras look (and feel) their best when kept over a dark substrate. You can use a fine gravel or sand substrate as long as it is well rinsed and aquarium safe. If you plan on setting up a heavily planted tank, an aquarium soil would be a great option.

Decor

Chili rasboras like plenty of structure in their environment where they can hide out from predators. Fine driftwood like spider wood is great because it mimics the tangled roots and branches these fish are used to in their natural habitat.

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Water Quality

The chili rasbora is actually really adaptable to a wide range of parameters, but they do require good water quality. They should never be added to an uncycled aquarium or kept in a tank with unstable or poor water quality. Consider doing a fishless cycle to make sure you start on the right foot.

Filtration

Filtration is vital because the chili rasbora requires, stable, high-quality water with zero nitrites and ammonia. This means your aquarium needs to be cycled before you introduce your fish.

If you’re not sure how to cycle a new aquarium, go ahead and check out my article on aquarium cycling to learn everything you need to know about this vital step!

The type of filter you choose is not that important as long as it is a good size for your tank. The most important factor to consider is that chili rasboras are tiny and they will get blown around in a strong current. They can also be sucked into strong filter intakes, so you might want to choose a model that has a prefilter sponge.

Water Parameters

The chili rasbora prefers a water temperature anywhere between 70°F and 82°F, with something around the middle of this range probably being ideal. Use a heater to keep the temperature stable in your tank.

These fish prefer soft water that is slightly acidic. Aim for the following parameters:

pH: 4-7
GH: 1-2
KH: 3-12dKH

The chili rasbora needs really good water quality in order to thrive. Your water test results should always read zero ammonia, zero nitrite, and less than 20 ppm nitrates.

Aquarium Maintenance

Regular aquarium maintenance is the only way to keep nano tanks clean and safe for your fish. Performing a partial water change of 20-30% per week is a good way to keep nitrate levels in a safe range.

Be sure to remove any dead or dying plant matter, and suck up the dirt and waste that accumulates on your substrate with a gravel vacuum. If necessary, you can also rinse out your filter sponge media in the water you have just taken out of the tank. Remember to look after those precious beneficial bacteria!

Your tap water probably contains chemicals like chlorine or chloramine that are added to keep the water safe for human use. Unfortunately, these chemicals are toxic to fish, so make sure you use a water conditioner to neutralize the harmful effects.

Testing

The only way to know for sure if your maintenance schedule is appropriate is to test your aquarium water. Get yourself a test kit that can measure the following parameters:

Ammonia
Nitrite
Nitrate
pH
GH
KH

Test kits are really easy (and fun) to use. They work either by adding a drop of solution to some aquarium water in a test tube or by simply dipping a strip into your tank. All you need to do next is watch for the solution or strip to change color, and compare the results with the provided chart.

You should test your aquarium water before introducing your fish. This way you will know what your pH and water hardness are out of the tap.

If your tap water pH and hardness are too high, you need to use rainwater or RO water in your tank. Avoid using distilled water that is not remineralized.

Breeding

Breeding rasboras at home is a fun hobby that anyone can do with the right knowledge. Building up a big school can be a slow process, however, because these tiny fish only lay a few eggs at a time. Here is a wonderful video above by Mark’s Aquatics that goes into great detail. I have a few summary points below. Here’s what you need to know:

Sexing

Before you can breed these fish, you’ll need to make sure you have both males and females. The female chili rasbora grows a little larger than the males and will also have a rounder belly. Dominant male chili rasboras will turn a bright and deep shade of red.

How They Breed

The chili rasbora is an egg-scattering fish that doesn’t show any parental care. This means they won’t look after their eggs or fry. If your fish are happy in their tank and in good condition, they will start breeding on their own and you might even spot some babies after a while.

If you want to breed this species in a more controlled way, you’re going to want to set up a separate breeding tank. The breeding tank only needs to hold 3 gallons or so, and a small sponge filter will work great for aerating the water and maintaining water quality.

Conditioning And Breeding Your Fish

Start by feeding your fish high-quality foods like micro worms and brine shrimp for a few days to bring them into peak condition.

Next, add some well-conditioned adults to your breeding tank and if they are happy, the female chili rasbora should lay eggs after a day or so. Remove the breeding fish and the eggs will start to hatch after about 2 days.

Raising Fry

Chili rasbora fry need to be fed from their second day after hatching. Feed them infusoria. The fry are very small after hatching, so wait at least a week before doing a water change to avoid sucking them up by accident.

Health & Disease

The chili rasbora is known to be hardy fish, but like any species, they are susceptible to various health problems. Read on to learn how to evaluate your fish’s health, and which problems to look out for.

Evaluating Your Their Health

Whether you’re picking out fish down at your local fish store, or just keeping an eye on the health of your pets at home, knowing what to look out for is really important. Healthy chili rasboras are:

Active
Colorful
Able to swim right side up, without floating or sinking

Unhealthy chili rasboras can show the following warning signs:

Rapid breathing
Floating, sinking, or swimming upside down
Flashing and rubbing their sides on the substrate
White spots on the body
Bulging eyes
White stringy feces
Bloating

Common Health Issues And Treatment

Aquarium fish can get sick for a number of reasons. The most common causes are infections from fungi, bacteria, viruses, and parasites. They can also suffer from physical injuries of course.

Infections can come in with new fish or plants, so it’s important to quarantine before adding them to your tank. Fish that are comfortable in their environment have a much smaller chance of getting sick than fish that are under stress, so always look for the root cause when any fish gets ill.

Here are some possible health issues (and their treatment) that your chili rasboras could develop:

Ich. Treat with medication or salt
Columnaris- Treat with antibiotics, medication, or salt
Fin rot. Treat with antibiotics or salt
Pop-eye- Treat with Epsom salts

Whenever you are unsure, check my post about fish diseases and consult a veterinarian for more advice. A best practice is to quarantine your fish prior to putting them into a display tank. It’s more common with saltwater tanks, but it is also done in freshwater tanks, especially planted aquariums.

Where To Buy

Chili rasboras are popular fish that are available from many local pet and fish stores. There are a few very similar-looking species in the hobby though, so make sure you’re getting genuine chili/mosquito rasboras.

If you can’t find any chili rasboras locally, or just prefer the convenience of online shopping, these fish are available from a number of trusted online retailers.

FAQs

How many should be kept together?

The chili rasbora is a social schooling fish that should always be kept in groups. A minimum number of 6 or so is recommended, but 20 or more would be much better.

Are they hardy?

The chili rasbora is adaptable to a wide range of water parameters but they do require excellent water quality. They are very small fish, so it is best to acclimate them slowly when introducing them to your tank.

How big do they get?

The chili rasbora is a truly tiny species. They reach a maximum size of about 0.8 inches, but they is as small as 0.25 inches when you buy them!

What fish can live with them?

The chili rasbora can live with other freshwater fish in a community tank. Compatible tank mates include peaceful fish like otocinclus catfish, pygmy corydoras, and other fish that stay small. Avoid larger fish that could eat your chili rasboras or outcompete them for food.

Can they live alone?

Chili rasboras should never be kept alone because they are naturally social schooling fish. It is best to keep them in a nice big school, the bigger the better!

Do they need plants?

Chili rasboras don’t necessarily need plants to survive but they will be much happier in a heavily planted tank because this is similar to their natural habitat.

Is the Chili Rasbora Right for You?

Before you add a chili rasbora 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 mature, cycled tank that has been running for at least three months.
You are willing to keep a school of at least 10. Fewer than that and they hide.
You have a planted nano tank with moderate or dim lighting and dark substrate.
You are not planning to keep them with anything larger than 2 inches.
You are comfortable feeding micro foods like crushed flake, micro pellets, or live baby brine shrimp.
You enjoy slow payoff. The best color takes weeks to develop in the right conditions.
You can commit to stable water parameters. These fish do not tolerate swings.

If most of those points line up with your setup, the chili rasbora is worth serious consideration. If several do not, choose a species that matches your tank now rather than trying to force it.

Avoid If:

You want a fish visible from across the room – chili rasboras are 0.7 inch (1.8 cm) fish that reward close viewing in nano setups, not large tanks
You keep any fish larger than a small nano tetra – even medium community fish intimidate chili rasboras into permanent hiding
You do not have a mature, heavily planted nano tank – they do not adapt to new or sparsely decorated setups

What It Is Actually Like Keeping Chili Rasboras

You will not see them at first. For the first week they hide in plants and you will wonder if they are still alive. This is normal. Give them time.

The color builds slowly. They do not look like the photos on day one. In mature, tannin-stained water with dim lighting, the red deepens over weeks. In clean, bright water, they stay pale.

They school tighter when they feel safe. A stressed group scatters. A confident group moves together in a way that makes the entire tank look alive. That only happens in the right conditions.

Feeding is a challenge. They have tiny mouths. Standard flake food is too big. You need crushed flake, micro pellets, or live baby brine shrimp. If you are not feeding them properly, they are slowly starving.

How the Chili Rasbora Compares to Similar Species

Chili Rasbora vs Ember Tetra

Want a subtle, refined aquascape fish that rewards patience and perfect conditions? Chili rasbora. Want a visible, forgiving nano fish that shows color from day one without any special setup? Ember tetra. If you are not willing to build the tank around the fish, get the ember tetra. It will look better in a generic setup every single time.

The chili rasbora occupies a specific niche in the aquarium hobby. The most common question people ask is whether they should choose the chili rasbora or something similar that is more widely available. The answer comes down to three things: tank size, water parameters, and what other fish you are keeping. If your setup matches what the chili rasbora needs, nothing else compares. If not, there are alternatives worth exploring.

Final Thoughts

Chili rasboras in a bright, bare tank are pale ghosts. In a blackwater nano with leaf litter and dim light, they turn into the most intense red nano fish in the hobby.

Chili rasboras (Boraras brigittae) are one of the smallest tropical fish in the hobby. These stunning little fish are the perfect choice for fishkeepers who want a large number of fish but don’t have much room. Follow the tips in this guide to set up a great tank for your chili rasboras, and keep them happy and healthy.

Do you keep chili rasboras in your fish room? Tell us about your nano setup in the comments below!

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

Angelfish Tank Mates: My 15 Best Picks (And 4 I’d Avoid)

Angelfish tank mates are one of those topics where I see people make the same mistake over and over: forgetting that angels are cichlids. I’ve kept angelfish in community tanks for decades, and the wrong tank mates can bring out real aggression. especially as the fish mature. These 15 picks are the ones I’d actually trust in an angelfish community, with honest notes on what to watch for.

Angelfish are cichlids. and a lot of hobbyists forget that when they’re stocking a community tank. They’re generally peaceful, but they will eat smaller fish as they grow, and a breeding pair can become surprisingly territorial. I’ve seen neon tetras disappear overnight once angelfish in the same tank hit 3 inches. The tank mates that work best are mid-to-large tetras, corydoras, peaceful gouramis, and other similarly-sized community fish. This guide covers 15 species that consistently coexist well with angelfish, and 4 that I’d avoid based on experience.

Choosing Angelfish Tank Mates- What You Need To Know

Putting together a peaceful community aquarium can be a bit of a juggling act. You need to make sure every fish in the tank will be happy and get along. Angelfish make the perfect centerpiece fish for tropical community tanks, and it’s a good idea to start by building the tank around their needs.

In my experience managing aquarium stores, angelfish tank mate questions are among the most common I fielded, and the most common source of preventable losses. What works depends heavily on individual fish temperament, which is why a backup plan matters as much as a stocking list.

All you need to do then is make sure that all the other fish are compatible with your angelfish and the conditions it prefers. Before we move on to some great angelfish tank mates, let’s take a few minutes to get to know the star of the show!

Temperament

Angelfish are very peaceful as far as cichlids go. If you have a breeding pair, expect them to become a little more aggressive, however, especially with their own species. Angelfish will also defend their nest site against any intruders after breeding.

Size

Angelfish grow pretty large, so there isn’t a whole lot of common aquarium fish that can eat your angels. A standard angelfish can reach 6 inches in length and 8 inches from top to bottom, and altum angels grow even bigger!

Despite their size, angelfish have pretty small mouths compared with other cichlids. They are generally safe around smaller fish, but they will eat any fish small enough to swallow whole. Fish fry and very small nano species should not be kept with angelfish.

Competition

Angelfish are not the fastest-moving fish, but they can be pretty competitive around mealtimes. Avoid keeping fish that are too slow to get their fair share of the food. It is best to watch your fish closely to make sure no one is getting out-competed.

Feeding different areas of the tank simultaneously and using a combination of floating and sinking foods can be very helpful to spread out the competition.

Parameters & Aquarium Setup

Before you can choose suitable tank mates, it’s important to understand the needs of your angelfish. Angelfish are tropical freshwater fish that prefer water temperatures between 78 and 84°F. This is on the warmer side so it’s important that their tank mates are comfortable in the same temperatures.

Angelfish require good water quality, with zero ammonia or nitrite in the water. They prefer water with a slightly acidic to neutral pH, between 6.5 and 7.8. The water flow in the tank should be gentle because angelfish are not very strong swimmers.

The 15 Best

After reading about how to select tank mates for your angelfish, you’re probably very interested to learn about some great options! I’ve put together a list of 15 awesome compatible species to help you choose. Check out our video below from our YouTube channel. More detail is provided in the blog post below.

Even though each species on the list will make a great addition to your angelfish tank, make sure you pay attention to the following important information:

Scientific Name
Adult Size
Water Temperature
Minimum tank size
Care Level
Diet
Origin
Swimming Level

Now let’s get started!

Expert Take

I’ve kept and sold angelfish for over 25 years, and the stocking mistakes I see people make with them are remarkably consistent. Angelfish are the most misunderstood ‘beginner cichlid’ in the hobby. People add them to a community tank thinking they’re peaceful, then discover they’re ambush predators that will eat anything under 2 inches and will harass most fish once they’ve claimed territory. The key is size and speed, your tank mates need to be big enough to ignore and fast enough to escape. — Mark Valderrama, AquariumStoreDepot

Quick-Reference Comparison Table

Species	Adult Size	Min Tank	Ease	Compatibility
Corydoras Catfish	1-4 inches	15 gallons for most species	9/10	High
Ram Cichlids	1.5 inches	15 gallons	7/10	High
Molly Fish	3-5 inches	30 gallons	7/10	High
Kribensis	3-4 inches	20 gallons	9/10	High
Rosy Tetras	1.5 inches	20 gallons	9/10	High
Zebra Danios	1.5-2 inches	20 gallons	9/10	High
Cardinal Tetra	0.75-1.25 inches	15 gallons	7/10	High
Bristle Nose Plecos	4-5 inches	15 gallons	9/10	High
Otocinclus Catfish	2 inches	10 gallons	9/10	High
Praecox Rainbow Fish	2-3 inches	15 gallons	7/10	High
Harlequin Rasbora	1.25-1.75 inches	15 gallons	9/10	High
Cherry Barbs	1.5-2 inches	15 gallons	9/10	High
Rummy Nose Tetras	2 inches	20 gallons	7/10	High
Nerite Snails	1-1.5 inches	5 gallons	9/10	High
Black Skirt Tetra	2-2.4 inches	20 gallons	9/10	High

1. Corydoras Catfish

Ease: 9/10. One of the safest choices for this tank setup.

Scientific Name: Corydoras spp.
Adult Size: 1-4 inches
Water Temperature: 72-82°F
Care Level: Easy
Diet: Omnivore
Minimum tank size: 15 gallons for most species
Origin: South America
Swimming Level: Mostly bottom dwellers

Corydoras catfish, or cory cats as they are affectionately known, are awesome little bottom dwellers for tropical fish tanks. There are many different species to choose from in the aquarium hobby.

Corydoras catfish are social fish so make sure you pick up a group of at least 5 of the same species. They are incredibly peaceful little fish that will not bother your angelfish. The fact that they stay on the bottom means they will add another layer of interest and activity to your aquarium.

2. Ram Cichlids

Ease: 7/10. Good choice with a few conditions to watch.

Scientific Name: Mikrogeophagus ramirezi
Adult Size: 1.5 inches
Water Temperature: 80-86°F
Care Level: Moderate
Diet: Omnivore
Minimum tank size: 15 gallons
Origin: Venezuela, Brazil & Colombia
Swimming Level: Bottom

Ram cichlids are an amazing dwarf cichlid with great colors. Unlike other South American cichlid species, these fish are peaceful and stay very small. Rams come in some amazing color varieties like electric blue and golden.

Ram cichlids are shy little fish that need pristine water quality. This means they aren’t a great choice for beginners, but more experienced aquarists will find these stunning fish make an awesome tank mate for their angelfish!

3. Molly Fish

Ease: 7/10. Good choice with a few conditions to watch.

Scientific Name: Poecilia sphenops & Poecilia latipinna
Adult Size: 3-5 inches
Water Temperature: 68-82°F
Care Level: Moderate
Diet: Omnivore
Minimum tank size: 30 gallons
Origin: South, Central, & North America
Swimming Level: Midwater, top

Molly fish can make great tank mates for your angelfish. These hardy fish are livebearers that will breed readily in your aquarium. The fry usually get snapped up pretty quickly in community tanks but ask for females only if you would prefer them to not breed.

There are many great types of molly fish in the hobby, including sail fins and balloon varieties. Mollies prefer higher pH than most other tropical fish species, so they should only be kept in tanks with a pH over 7.5.

4. Kribensis

Ease: 9/10. One of the safest choices for this tank setup.

Scientific Name: Pelvicachromis pulcher
Adult Size: 3-4 inches
Water Temperature: 75-81°F
Care Level: Easy
Diet: Omnivore
Minimum tank size: 20 gallons
Origin: Nigeria, Cameroon
Swimming Level: Bottom

The kribensis is a stunning cichlid from over the ocean in West Africa. These small fish are happy in the same water parameters as angelfish, making them an ideal tank mate.

Kribensis are dwarf cichlids that spend most of their time at the tank bottom. These fish have a peaceful nature but can be aggressive towards other members of their own species, so it is best to keep them in a pair.

5. Rosy Tetras

Ease: 9/10. One of the safest choices for this tank setup.

Scientific Name: Hyphessobrycon rosaceus
Adult Size: 1.5 inches
Water Temperature: 75-82°F
Care Level: Easy
Diet: Carnivore
Minimum tank size: 20 gallons
Origin: Brazil, Suriname & Guyana
Swimming Level: Mid-water

Rosy tetras are a little-known but awesome tropical aquarium fish. They are very small fish but they are safe to keep with larger angelfish because of their shape. It is best to keep 6 or more of these peaceful schooling fish in a community aquarium so that they can be more confident and behave naturally.

Hard Rule: Never add small tetras (neons, cardinals, embers) to a tank with adult angelfish. An adult angel can and will eat them whole. The rule applies even if you raised the angel with them as a juvenile.

6. Zebra Danios

Ease: 9/10. One of the safest choices for this tank setup.

Scientific Name: Brachydanio rerio
Adult Size: 1.5-2 inches
Water Temperature: 70-78°F
Care Level: Easy
Diet: Carnivore
Minimum tank size: 20 gallons
Origin: India
Swimming Level: Midwater

Zebra danios are another species that make great tank mates for freshwater angelfish. They will add more activity and excitement to your angelfish tank without bothering their tank mates.

They are hardy fish that get their common name from their black and white striped bodies. Zebra danio fish are lively little creatures that are very peaceful and easy to care for.

7. Cardinal Tetra

Ease: 7/10. Good choice with a few conditions to watch.

Scientific Name: Paracheirodon axelrodi
Adult Size: 0.75-1.25 inches
Water Temperature: 73-84°F
Care Level: Moderate
Diet: Omnivore
Minimum tank size: 15 gallons
Origin: Brazil & Venezuela
Swimming Level: Midwater

The cardinal tetra is one of the most colorful tropical aquarium fish in the hobby. Apart from their colors, the great thing about these tetra fish is how peaceful they are! A school of 6 or more would make ideal tank mates for your freshwater angelfish.

8. Bristle Nose Plecos

Ease: 9/10. One of the safest choices for this tank setup.

Scientific Name: Ancistrus spp.
Adult Size: 4-5 inches
Water Temperature: 70-79 °F
Care Level: Easy
Diet: Herbivore
Minimum tank size: 15 gallons
Origin: South America
Swimming Level: Bottom dweller

Bristlenose plecos are really strange-looking bottom feeders that make one of the best angelfish tank mates. These bottom-dwelling fish hail from the Amazon river basin but have found a second home in aquariums all over the world.

Bristlenose plecos are very peaceful with other fish, but they should be the only member of their species unless you have a very large tank. There is also a Albino variety available.

9. Otocinclus Catfish

Ease: 9/10. One of the safest choices for this tank setup.

Scientific Name: Otocinclus spp.
Adult Size: 2 inches
Water Temperature: 74-79°F
Care Level: Easy
Diet: Algae
Minimum tank size: 10 gallons
Origin: South America
Swimming Level: All levels

Otocinclus catfish are amazing algae eaters that will help to keep your glass, hardscape, and plants clean. These hardworking tank cleaners look great too, and they can be very interesting to watch as they zoom around the tank looking for new feeding spots.

Otos need a good supply of algae to stay healthy, so make sure you wait until your tank is mature before introducing them.

10. Praecox Rainbow Fish

Ease: 7/10. Good choice with a few conditions to watch.

Scientific Name: Melanotaenia praecox
Adult Size: 2-3 inches
Water Temperature: 73-82°F
Care Level: Moderate
Diet: Omnivore
Minimum tank size: 15 gallons
Origin: New Guinea
Swimming Level: Midwater, top

Rainbowfish are another great schooling fish that can really help to liven up your aquarium. The praecox rainbowfish is just one of many rainbowfish that make great angelfish tank mates.

Rainbowfish need great water quality but are otherwise easy to care for. They should be kept in groups of 6 or more to bring out the best of their colors and behaviors.

11. Harlequin Rasbora

Ease: 9/10. One of the safest choices for this tank setup.

Scientific Name: Trigonostigma heteromorpha
Adult Size: 1.25-1.75 inches
Water Temperature: 70-82°F
Care Level: Easy
Diet: Carnivore
Minimum tank size: 15 gallons
Origin: Southeast Asia
Swimming Level: Midwater

These popular freshwater fish are recognizable by their bright orange color and the black triangular marking on their sides. They are very attractive fish that look amazing as they school together in the water column. Harlequin rasboras are very peaceful fish that add will vibrant color and activity to your angelfish community aquarium.

12. Cherry Barbs

Ease: 9/10. One of the safest choices for this tank setup.

Scientific Name: Puntius titteya
Adult Size: 1.5-2 inches
Water Temperature: 68-80°F
Care Level: Easy
Diet: Omnivore
Minimum tank size: 15 gallons
Origin: Sri Lanka
Swimming Level: Midwater

Not all barb species make good tank mates for angelfish, but the peaceful cherry barb makes an excellent choice! These popular shoaling fish have a peaceful nature, making them a great community fish. Cherry barbs are a social species, so make sure you pick up a group of at least 6.

13. Rummy Nose Tetras

Ease: 7/10. Good choice with a few conditions to watch.

Scientific Name: Hemigrammus rhodostomus
Adult Size: 2 inches
Water Temperature: 76-80°F
Care Level: Moderate
Diet: Omnivore
Minimum tank size: 20 gallons
Origin: Amazon river basin, Brazil & Venezuela
Swimming Level: Midwater, top

Rummy nose tetras are schooling fish that make great tank mates for angelfish. They are active community fish that should be kept in groups of ten or more to see them at their best. The rummy nose tetra needs excellent water quality to really thrive so good filtration and regular maintenance are very important.

14. Nerite Snails

Ease: 9/10. One of the safest choices for this tank setup.

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Scientific Name: Neritina spp. Vittina spp. Clithon spp.
Adult Size: 1-1.5 inches
Water Temperature: 72-82°F
Care Level: Easy
Diet: Algae
Minimum tank size: 5 gallons
Origin: Africa & Asia
Swimming Level: Bottom

If you’re looking for some excellent tank cleaners for your angelfish community setup, nerite snails could be a perfect choice. These harmless aquarium snails have beautiful shells and do an amazing job of eating pesky algae in the tank. One of the best things about these snails is that they can’t breed in freshwater, so you never have to worry about them becoming a pest!

15. Black Skirt Tetra

Ease: 9/10. One of the safest choices for this tank setup.

Scientific Name: Gymnocorymbus ternetzi
Adult Size: 2-2.4 inches
Water Temperature: 68-78°F
Care Level: Easy
Diet: Omnivore
Minimum tank size: 20 gallons
Origin: Argentina, Bolivia, & Brazil
Swimming Level: Midwater

The black skirt tetra is another peaceful species of schooling fish that works great with freshwater angelfish. These fish are also known as the black widow tetra but don’t worry, there’s nothing dangerous about them.

Black skirt tetras are active swimmers that should be kept in groups of 6 or more. They aren’t the most colorful tetras, but this can help draw attention to your centerpiece fish, the angels.

Bonus Tank Mates For Angelfish

The 15 peaceful fish in this list make awesome tank mates for freshwater angelfish, but there are many other options to choose from. Here are a few more popular species to consider:

4 Fish To Avoid

Now that you know 15 great tank mates for angelfish, let’s take a look at some common species that you should avoid:

1. Goldfish

The obvious problem with goldfish is that they are coldwater fish that prefer water that is 72°F or cooler. This is too cold for your angelfish, so the two species are not compatible. For the same reason, other coldwater fish like white cloud mountain minnows and dojo loaches do not make good angelfish tank mates.

2. Betta Fish

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Bettas are slow-moving fish with long flowing fins. Keeping them with angelfish is risky because they can be easy targets for aggressive individuals. Some fish keepers might have had success, but I would not recommend trying this combo.

3. Semi-aggressive Barbs

Some aggressive species of barbs are notorious fin nippers and will not make good tankmates for angelfish. Tiger barbs, including green tiger barbs and Glofish barbs, should not be added to your angelfish community.

Other potential fin-nipping species like zebra loaches and head and tail light tetras should also be avoided.

4. Freshwater Shrimp

Freshwater Shrimp

Freshwater aquarium shrimp are a great addition to small tanks and aquascapes. Peaceful, full of personality, and colorful. Many varieties are available.

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Angelfish will not think twice about snacking on freshwater shrimp. Some shrimp might survive in a heavily planted tank with loads of hiding space, but you’ll probably see their population decreasing pretty steadily!

Angelfish Community Aquarium Setup

Setting up an awesome angelfish community tank could be as simple as introducing other fish to your existing aquarium. If you don’t already have an angelfish community tank, here’s what you need to know:

Introducing Aquarium Companions

It’s really important to have a backup plan in case your angelfish don’t get along with their new tank mates. At the end of the day, each fish has its own personality, and what works for a hundred other fish keepers might not work in your tank. I’ve seen this firsthand, pairs of angelfish that were model community fish in one display tank and absolute tyrants in another. The fish doesn’t change; the tank dynamics do.

I recommend setting up a small, inexpensive aquarium separate from your angelfish community tank. This tank only needs to be a few gallons, with a small filter and a heater. If war breaks out after you introduce tank mates, they can always be moved into this tank temporarily until you return them to the store or make another plan.

A tank like this has other great benefits too. New fish can be quarantined in this tank before going in with your angelfish to prevent spreading any diseases to your other fish. It will really come in handy down the line if any of your fish get sick and need a hospital tank.

If you have some issues with angelfish aggression, check out this video below by Hardyaquariums. His 5 tips are summarized below:

Balance the number of males and females
Buy dither fish for your angelfish to chase around (like Danios)
Get a bigger aquarium that is tall
Make hiding spaces for your angelfish for them to claim territory
Feed your angelfish well – Well fed fish will not fight as much

Aquarium Size

Angelfish can be kept in tanks as small as 29 gallons. Some fish keepers even go as low as 20 gallons, but I would recommend going larger if you can. 55 gallons or larger will allow you the room to create a thriving and busy angelfish community with loads of amazing tropical tank mates.

One important thing to remember when picking out a tank is the angelfish body shape. These fish have really deep bodies that are taller than they are long. Tall tanks are therefore a better choice than long ones.

Heating

Angelfish prefer warm water between 78 and 84°F. You’re going to need an aquarium heater to maintain this temperature in your tank. Make sure the heater you buy is rated for the size of your aquarium.

I recommend using a thermometer if your heater does not have a display, this makes monitoring the water temperature in your tank much easier. Heater control is even better if it’s within your budget.

Filtration

Maintaining a healthy and beautiful angelfish community aquarium is almost impossible without good-quality filtration. There are so many different types of aquarium filters on the market, however, so which type should you choose?

Aquarium filters come in different sizes, but the amount of water the manufacturers claim they can filter is just a guideline really. I recommend opting for a slightly larger filter if it doesn’t take up too much room. Canister filters are ideal for this purpose because they can be kept out of sight in the cabinet under your tank.

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Hang on back and internal filters work great too, just make sure the filter isn’t producing too much current. Remember, angelfish aren’t very strong swimmers! A filter with an adjustable output is very useful for dialing in the perfect flow.

Aquarium Maintenance

Aquarium maintenance is very important for maintaining happy and healthy fish in your angelfish community tank. Here’s what you need to do:

Use a test kit regularly to monitor your water parameters. Your nitrate levels should not go over about 30 parts per million, and ammonia and nitrite should always read zero.
Remove any physical waste and uneaten fish food from the bottom of your tank with a gravel vacuum.
Perform a partial water change 2-4 times per month to keep your nitrate levels safe.
Follow the recommended maintenance schedule for your filter model, and rinse out the media when necessary.

Feeding

Angelfish are not that picky about their diet. These fish can be fed a staple diet of dried food like pellets (like Fluval Bug Bites) and freeze dried foods. Supplement this diet with frozen or live foods like brine shrimp and blanched veggies like zucchini for a complete and balanced diet.

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Not all of the tank mates in this list will thrive on this diet so it’s important to cater to each species in the tank. Bottom dwellers like cory catfish, for example, should be given sinking pellets or tablets. Algae eaters like otocinclus catfish will need a steady diet of algae, but you can suppliment this algae wafers.

Avoid overfeeding your fish because uneaten food can spoil and cause dangerous ammonia spikes. Feeding your fish small amounts of food more than once a day is a good way to avoid this. Another good tip is to provide only enough food for the fish to finish in a minute or two.

Live Plants

Angelfish thrive in a heavily planted tank. Fortunately, so do all the other fish species on this list! Many fishkeepers think you need very deep pockets and a degree in botany to grow live aquarium plants, but it’s actually really easy to get started.

If you’ve never grown live plants before here are a few things to know:

Plants need light to grow. Different species need different amounts of light, but there are many aquarium plants you can grow under regular aquarium lighting.
Plants need nutrients. Different types of plants get their nutrients in different ways. Some types of plants can be grown without soil or substrate and get their nutrients from liquid fertilizers. Other types of plants need nutrients at their roots.
Plants need carbon dioxide. All plants need CO2 to grow, but some species need more than others. If you want to get serious about growing plants, you’ll probably want to invest in a CO2 injection system. If you’re just starting out, choose low light, low CO2 plants.

You’ll find loads of great articles on caring for different plants on this website, go ahead and check them out. Growing live plants is fun, and your angels and their tank mates will thank you for it!

Substrate & Decorations

The substrate is the sand or gravel at the bottom of the aquarium. There are so many different types available that it can be hard to pick one! The color is up to you, but most aquarium fish seem to prefer darker colors.

Sand or gravel can work great, just make sure they are aquarium safe and that you wash them out thoroughly before setting up the tank. There are some great aquarium soils available for planted tanks. Avoid these unless you plan on growing a lot of plants.

Decorations can turn an average-looking fish tank into an amazing one. As with the substrate, you can use your creativity and decide whether to go for a natural look or create a unique scene. Again, its really important that anything you put into the tank is clean and aquarium-safe. Natural decor like driftwood or aquarium rocks are great if you want to try build to an aquascape style

Where To Buy

Most of the angelfish tank mates in this list are common species that are easy to find in most aquarium stores and pet shops. If you don’t have a decent local fish store where you live, you can always go ahead and order your fish online. Buying online will also give you access to rarer breeds.

Mark’s Pick: Bolivian rams or German blue rams. Similar water requirements, mid-level fish, and they coexist well because angels and rams don’t compete for the same space or food zone.

FAQS

What Fish Can Be Kept With This Type of Fish?

Popular aquarium fish like cory catfish, otos, rainbow fish, and many types of tetras can be kept with angelfish. There are plenty of other fish species that make great angelfish tankmates too. The ideal tank mates are peaceful fish that enjoy the same water parameters.

What Fish Do They Not Get Along With?

Angelfish should not be kept with aggressive fish or fin nippers. Avoid larger cichlids like oscars and small aggressive fish like tiger barbs.

Are They Good Community Fish?

Angelfish make great peaceful community fish if they are kept with the right tank mates. They can be a little aggressive when breeding but are generally safe to keep with other peaceful fish that enjoy the same conditions.

How Many Can Be Kept Together?

Angelfish can be kept in pairs or small groups of 4-6 individuals. The number of angelfish you can keep together will also depend on the size of your tank. These fish can get territorial when breeding, so it’s important that the non-breeding angelfish have enough space to avoid conflict.

Who Is This Setup Right For?

Good Fit If:

You have a tall 55+ gallon tank with plenty of vertical swimming space
You want larger, peaceful mid-water companions that won’t compete with angels
You’re keeping South American biotope fish that share the same water parameters (pH 6.5–7.0)
You want an active centerpiece fish with companion species rather than a species-only tank

Avoid If:

You have small tetras under 2 inches, adult angels will eat them
Your tank is under 40 gallons, territorial disputes become unavoidable
You want fin-nippy species like barbs, they’ll shred the angel’s long fins
You plan to keep multiple male angels, they pair and become extremely territorial when breeding

Final Thoughts

Angelfish are easily one of the most beautiful species for freshwater aquariums and they make great community fish too. With the right tank mates and knowledge, any fishkeeper can create a thriving tropical community in their own home.

So what are you waiting for? Go ahead and start planning your own angelfish community today!

Do you have an angelfish community tank? Tell us about your favorite angelfish tank mates in the comments below!

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

May 6, 2022

15 Best Brackish Water Fish: The Complete Guide (And Common Mislabeling Explained)
Table of Contents
Brackish water is one of the most underappreciated setups in the hobby, and I’ve always thought it deserves more attention. The species you can keep in brackish. figure-eight puffers, archerfish, mudskippers. you simply can’t replicate in freshwater or saltwater. I’ve kept brackish tanks and the challenge of nailing that salinity range is part of what makes it interesting. This guide covers the 15 species I’d actually recommend for a brackish setup.

Brackish water is one of the most underserved niches in the freshwater hobby. and also one of the most commonly misrepresented at the fish store level. A lot of popular species get sold as “freshwater” when they’re actually brackish: green spotted puffers, archer fish, bumblebee gobies, figure-eight puffers, and more. These fish often survive short-term in freshwater but slowly decline over months without the salt content they need. A true brackish setup uses marine salt at a lower concentration than a reef tank (specific gravity around 1.005 to 1.015) and produces fish with noticeably better health and color. This guide covers 15 species that genuinely thrive in brackish, along with what setting up a proper brackish tank actually involves.

What Most Care Guides Get Wrong About 15 Best Brackish Water Fish (And Common Mislabeling Explained)

The most common mistake I see with 15 best brackish water fish (and common mislabeling explained)s 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. 15 Best Brackish Water Fish (And Common Mislabeling Explained)s 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, 15 best brackish water fish (and common mislabeling explained)s are adaptable.

What Are They?

Brackish fish are native to environments where fresh and saltwater mix. These environments are common in coastal areas all over the world, particularly where rivers and streams meet the ocean.

This type of habitat is known as an estuary, although brackish coastal lakes also exist. The salinity of brackish water varies with the tides and other factors like river water levels. As a result, these brackish water fish species must either move with the water or be adaptable to these changeable conditions.

Brackish fish are technically known as euryhaline species¹, which means they can adapt to different salinities. They can often live in fully fresh or marine water for certain periods of time, but they are most comfortable in that in-between range for the long term.

Why Keep this type?

There are many reasons to keep a brackish aquarium. The most obvious is probably because there are some truly amazing-looking brackish fish species! In fact, many of the fish sold as freshwater fish are actually brackish. If you want to give these fish the best care, you’re going to need to go brackish.

Apart from the fish themselves, the brackish environment is a fascinating underwater world. A Brackish water environment is an exciting new challenge for anyone who has started out with a tropical freshwater tank.

15 Best Brackish Water Fish

Now that you know what a brackish aquarium fish is, it’s time to get to know some of the best types! All of these species are suitable for the home aquarium, but their care and space requirements differ very much. I have a video above from our official YouTube Channel for a visual. Our blog will go in more detail below. That’s why I’ve put together the following list of vital stats for each species:
- Scientific Name
- Difficulty Level
- Temperament
- Adult Size
- Minimum Tank Size
- Diet
- Origin
- Temperature
- Water salinity/specific gravity
- pH
- Difficulty to breed
Let’s get started!

1. Mollies
- Scientific Name: Poecilia latipinna, Poecilia sphenops
- Difficulty Level: Easy
- Temperament: Peaceful/semi-aggressive
- Adult Size: 5-7 inches
- Minimum Tank Size: 15 gallons
- Diet: Feed dried and live/frozen food, spirulina/vegetable matter
- Origin: USA, Mexico, Northern South America
- Temperature: 72-82°F
- Water salinity/specific gravity: 1.005-1.015
- pH: 7-8.5
- Difficulty to breed: Easy
Molly fish are highly adaptable fish that can be kept in anything from hard freshwater all the way to full marine conditions. In fact, these inexpensive livebearers thrive in brackish conditions!

There are a few different species and many different breeds available in the fish-keeping hobby. Check out my complete guide for more details on these awesome beginner brackish aquarium fish!

2. Guppy Fish

Guppy Fish

An undemanding fish that is a livebearer. Many varieties available

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- Scientific Name: Poecilia reticulata
- Difficulty Level: Easy
- Temperament: Peaceful
- Adult Size: 1.5-2.5 inches
- Minimum Tank Size: 10 gallons
- Diet: Feed dried and live/frozen foods, spirulina/vegetable matter
- Origin: Northern South America & Caribbean Islands
- Temperature: 63-82°F
- Water salinity/specific gravity: 1.001-1.010
- pH: 7-8.5
- Difficulty to breed: Easy
Guppies are the smaller, more colorful cousins to the molly fish. These popular livebearers are one of the most common species in the aquarium trade. They are available in an amazing variety of shapes and colors, and they’re really easy to breed in the home aquarium.

Guppy fish is usually thought of as freshwater fish species, but they can be kept in brackish water too. In fact, studies have shown that these amazing fish can even tolerate full marine conditions.

3. Endler’s Livebearers

Endler's Livebearers

A very active and colorful livebearer. Smaller in size than guppies

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- Scientific Name: Poecilia wingei
- Difficulty Level: Easy
- Temperament: Peaceful
- Adult Size: 1-1.8 inches
- Minimum Tank Size: 10 gallons
- Diet: Feed dried and live/frozen foods, spirulina/vegetable matter
- Origin: Venezuela, South America
- Temperature: 75-86°F
- Water salinity/specific gravity: 1.001-1.025
- pH: 7-8.5
- Difficulty to breed: Easy
The Endler’s livebearer is another great nano brackish fish. These hardy fish thrive in brackish environments, even though they are usually kept in freshwater.

The males of these tiny fish are much smaller and more colorful than the females, so if you don’t want them to breed, males are the better choice. Endler’s livebearers should not be kept with large fish or aggressive tank mates.

4. Archer
- Scientific Name: Toxotes jaculatrix
- Difficulty Level: Moderate
- Temperament: Semi-aggressive
- Adult Size: 12 inches
- Minimum Tank Size: 125 gallons
- Diet: Feed dried & live/frozen foods
- Origin: Widespread in Southern Asia and Northern Australia
- Temperature: 77-86°F
- Water salinity/specific gravity: 1.005-1.010
- pH: 7-8
- Difficulty to breed: Advanced
Archerfish are brackish fish species with a fascinating hunting technique. In their natural habitat, these intelligent fish spit water at insects on leaves and tree branches above the water. This knocks the prey onto the water surface where the fish can get to it. Pretty neat!

They will also take regular flake food and do great in larger brackish water aquariums. These fish are generally very peaceful with other fish but can be a little nippy with other archerfish unless kept in groups of 4 or more.

5. Scat
- Scientific Name: Scatophagus argus
- Difficulty Level: Moderate
- Temperament: Semi-aggressive
- Adult Size: 15 inches
- Minimum Tank Size: gallons
- Diet: Dried foods, live/frozen foods, vegetable matter
- Origin: The Middle East to Australia
- Temperature: 68-82°F
- Water salinity/specific gravity: 1.005-1.025
- pH: 7.5-8.5
- Difficulty to breed: Advanced
Scats are large and beautiful brackish water aquarium fish. These spotted fish look amazing in schools in large aquariums. These curious fish make wonderful pets and are easy to feed and care for.

The secret is to keep them in groups of at least 4 fish, maintain excellent water quality in a large enough tank, and always make sure their water is in the preferred salinity range.

6. Mono
- Scientific Name: Monodactylus argenteus, M. sebae
- Difficulty Level: Advanced
- Temperament: Semi-aggressive
- Adult Size: 10 inches
- Minimum Tank Size: 125 gallons
- Diet: Dried foods, live/frozen foods, vegetable matter
- Origin: Widespread along African and Asian coasts
- Temperature: 75-82°F
- Water salinity/specific gravity: 1.005-1.025
- pH: 7.2-8.4
- Difficulty to breed: Advanced
These beautiful silvery fish are very fast and active so they require a large aquarium with plenty of swimming space. They make great tank mates for other brackish fish like scats, although they do equally well in full marine tanks. Mono fish can be skittish and are known to be fin nippers too, so they are best left to expert aquarists.

7. Green Spotted Puffer
- Scientific Name: Tetraodon nigroviridis
- Difficulty Level: Moderate
- Temperament: Semi-aggressive
- Adult Size: 6 inches
- Minimum Tank Size: 30 gallons
- Diet: Live/ frozen foods, and hard-shelled food sources like snails are essential
- Origin: India to Southeast Asia
- Temperature: 75-82°F
- Water salinity/specific gravity: 1.005
- pH: 7.5-8.5
- Difficulty to breed: Advanced
The green spotted puffer is an amazing brackish water aquarium fish for more experienced fish keepers. These active puffers can be kept with other fish in a community setup, but they should be the only pufferfish in the tank to avoid aggression.

Pufferfish have beak-like teeth that grow continuously. It is very important to feed these fish hard food like snails and shellfish to keep their teeth worn down.

8. Figure 8 puffer
- Scientific Name: Tetraodon biocellatus
- Difficulty Level: Moderate
- Temperament: Semi-aggressive
- Adult Size: 3 inches
- Minimum Tank Size: 20 gallons
- Diet: Live/ frozen foods, hard-shelled food sources like snails are essential
- Origin: Southeast Asia
- Temperature: 72-79°F
- Water salinity/specific gravity: 1.005
- pH: 6.5-7.5
- Difficulty to breed: Advanced
The figure 8 puffer fish is an awesome species that can be kept in both fresh and brackish water conditions. They get their name from the interesting markings on their backs. These little fish are generally peaceful but they are known to nip the fins of slow-moving tankmates

9. Bumblebee Goby
- Scientific Name: Brachygobius doriae
- Difficulty Level: Moderate
- Temperament: Semi-aggressive
- Adult Size: 1-1.5 inches
- Minimum Tank Size: 10 gallons
- Diet: Feed live food
- Origin: Borneo
- Temperature: 72-82°F
- Water salinity/specific gravity: 1.001-1.006
- pH: 7-8.5
- Difficulty to breed: Moderate
These nano fish are best for a small species only tank. They get their name from their bold black and yellow colors. This fish can be a bit of a picky eater and they generally prefer live food.

The bumblebee goby can be a little aggressive with other members of its own species so it is best to keep at least 6 together to prevent anyone from getting singled out. A brackish aquarium with plenty of hiding places is ideal for the bumblebee goby.

10. Dragon goby
- Scientific Name: Gobioides broussonnetii
- Difficulty Level: Moderate
- Temperament: Semi-aggressive
- Adult Size: 15-25 inches
- Minimum Tank Size: 125 gallons
- Diet: Feed algae wafers, live/frozen foods
- Origin: Widespread along the North, Central & South American coasts
- Temperature: 73-79°F
- Water salinity/specific gravity: 1.005-1.015
- pH: 7.5-9
- Difficulty to breed: Advanced
The dragon goby is a strange, eel-like fish. Dragon gobies are actually a whole lot more peaceful than they look or sound though.

They are not known to bother or eat smaller fish, although they can be semi-aggressive to other members of their own species. The Dragon goby can grow really long, so they should be kept in large tanks for good long-term care.

11. Orange Chromide
- Scientific Name: Etroplus maculatus
- Difficulty Level: Moderate
- Temperament: Peaceful
- Adult Size: 3 inches
- Minimum Tank Size: 20 gallons
- Diet: Feed, dried and live/frozen foods, spirulina/vegetable matter
- Origin: India & Sri Lanka
- Temperature: 68-82°F
- Water salinity/specific gravity: 1.002-1.010
- pH: 7-8.5
- Difficulty to breed: Moderate
Orange chromides (video source) can be kept in both fresh and brackish waters. This beautiful fish requires great quality water so regular aquarium maintenance is very important.

They are peaceful but will eat very small fish if they can catch them. Provide your orange chromides with a varied diet that includes both meaty foods and plant matter.

12. Kribensis
- Scientific Name: Pelvicachromis pulcher
- Difficulty Level: Easy
- Temperament: Semi-aggressive
- Adult Size: 3-4 inches
- Minimum Tank Size: 20 gallons
- Diet: Cichlid pellets, frozen/live foods
- Origin: Cameroon and Nigeria
- Temperature: 75-81°F
- Water salinity/specific gravity: 1.000-1.005
- pH: 5-7.5
- Difficulty to breed: Easy
Kribensis cichlids are usually kept in freshwater tanks but they can survive in slightly brackish water too. These fish have beautiful colors and bold horizontal stripes that can really brighten up your tank.

These beautiful West African cichlids are very peaceful except when breeding. It is best to keep a single pair with other fish in a community tank.

13. Golden Wonder Killifish
- Scientific Name: Aplocheilus lineatus
- Difficulty Level: Easy
- Temperament: Semi-aggressive
- Adult Size: 4 inches
- Minimum Tank Size: 20 gallons
- Diet: Feed dried, frozen/live foods
- Origin: India & Sri Lanka
- Temperature: 72-77°F
- Water salinity/specific gravity: 1.000-1.005
- pH: 6-7.5
- Difficulty to breed: Moderate
The golden wonder killifish (video source), or striped panchax, is another great species that can be kept in either fresh or slightly brackish water. These predatory fish will eat smaller fish, so they should only be kept with similarly sized fish. These hardy and adaptable killifish spend most of their time at the top of the tank.

14. Banded Banjo Catfish
- Scientific Name: Platystacus cotylephorus
- Difficulty Level: Easy
- Temperament: Peaceful
- Adult Size: 12 inches
- Minimum Tank Size: 30 gallons
- Diet: Sinking dried foods, live/frozen food
- Origin: Widespread in Central & South America
- Temperature: 72-77 °F
- Water salinity/specific gravity: 1.003-1.010
- pH: 6-8.2
- Difficulty to breed: Advanced
The banded banjo catfish (video source) is nocturnal fish with a very unusual body shape. These fish aren’t the most active or exciting to watch, but they still make a great oddball specimen for a brackish tank. They make great community fish but should not be kept with very small fish that could be swallowed whole.

15. Colombian shark catfish
- Scientific Name: Ariopsis seemanni
- Difficulty Level: Advanced
- Temperament: Peaceful
- Adult Size: 12-14 inches
- Minimum Tank Size: 225 gallons
- Diet: Meaty foods, can be picky eaters
- Origin: Coastal regions of eastern Central and South America
- Temperature: 72-78 °F
- Water salinity/specific gravity: 1.015-1.025
- pH: 6.8-8.5
- Difficulty to breed: Advanced
The Colombian shark catfish is not an aggressive fish but it will swallow any smaller fish that it can catch. These are large fish so they should not be purchased unless you have plenty of room.

One important thing to note is that their fins have venomous spines that can cause serious pain and swelling. This means you should be very careful about handling these fish.

Tank Setup

Setting up a great brackish aquarium is not that different from setting up a regular tropical fish tank. Let’s take a look at how to set up a brackish water aquarium.

Substrate & Decorations

You have a few choices when it comes to the substrate for brackish tanks.

Aragonite is an excellent option because it releases calcium carbonate into the water which helps to maintain stable and healthy high pH levels. This substrate looks great and is easy to clean. Aragonite is available in various colors and textures from fine sand to larger particles.

Crushed coral is another great option for a brackish tank but is a little more difficult to maintain because of the larger grain size. You can still get the benefits of this material by putting some into your filter media compartment.

Dry Rock

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When it comes to decorations, you can use any aquarium safe ornaments that are suitable for saltwater. Rocks are a great choice but small amounts of driftwood can be used too. Avoid large amounts of driftwood, however, since they can leach tannins and lower the water pH to some degree.

Planted Tanks

It will be surprising for some aquarists to hear that you can in fact grow live plants in a brackish water aquarium. The water’s specific gravity or salinity levels certainly do play a role in what kind of plants can be grown, however.

On the higher salinity end, few common aquarium plants will be able to survive. There are options, however, including the various mangrove species, seagrasses, and algae.

Fortunately, many well-known aquarium plants are adaptable to low salinity levels. The following species can be grown in slightly brackish water:
- Marimo moss balls
- Java fern
- Microsword
Lighting & Filtration

Unless you are growing live plants, bright lighting is not required for a brackish tank. The timing of your lighting is important, however. Maintain a regular day/night schedule for your fish by setting your lighting on a timer. 6 to 8 hours per day is recommended.

You can use a regular hang-on back or internal power filter in your brackish water aquarium, but canister filters are preferred because they hold so much more filtration media.

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How To Take Care

Apart from their specific salinity needs, brackish fish have much the same needs as any other species. Read on to learn more about caring for fish in brackish aquariums.

Aquarium Maintenance

Performing regular aquarium maintenance is just as important for a healthy brackish aquarium as it is for any other type of fish tank.

Weekly or twice monthly partial water changes and gravel vacuuming will help keep nitrate levels within a safe range for your fish.

Salinity Levels

The main difference between a freshwater tank and a brackish fish tank is the salinity level. Pure freshwater is 1.000 while marine water has a salinity of 1.025. Brackish water aquariums are typically maintained between about 1.005 and 1.012. You can measure salinity with a refractometer and adjust it with calibration solution.

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Preparing

Brackish water is prepared by mixing marine salt with fresh water or mixing marine water with fresh water. Not just any salt will do of course! You’ll need to use good quality marine salt for this. Regular aquarium salt does not contain all the mineral elements that occur in natural brackish water.

It is best to use RO water because you will be starting from a ‘level playing field’. If you are using tap water, make sure to mix in a water conditioner to neutralize any harmful chemicals.

Always mix up the water before adding it to your aquarium. Mix up your water in a separate bucket so you can siphon out the old water into one bucket, and add the new water right after.

Testing

Apart from a regular water test kit that all fishkeepers should have, there’s one extra piece of equipment you will need. Since you will be mixing salt into your water, you’ll need a device to help you measure and monitor the salinity in your tank.

You can opt for an inexpensive hydrometer if you’re happy with ‘ballpark’ readings. This is usually perfectly fine for brackish tanks because the animals tend to be quite adaptable.

For more accurate readings, spend a little more and pick up a decent refractometer. Whichever instrument you choose, make sure to test your salinity (and other parameters) after each water change.

Where To Buy

Brackish water species are not as easily available as freshwater species, but you can still find them at your local fish store from time to time. Common species like sailfin mollies and guppies can be found just about anywhere, but I would recommend trusted online retailers for the more exotic species.

FAQS

Can freshwater fish live in this?

True freshwater fish should not be kept in brackish water. Many freshwater species will survive for varying amounts of time in brackish water, but it will certainly put them under stress and reduce their lifespan.

What fish can live in both salt and freshwater?

There are a few aquarium fish that can live in both fresh and saltwater. These types of fish are called euryhaline species.

Most of these species are at home somewhere in between these two environments, however. Mollies are fish that can live in both fresh and saltwater.

What freshwater fish can survive in this type?

Mollies, guppies, and Endler’s livebearers are all fish that people tend to think of as freshwater species. In fact, all of these species are perfectly at home in brackish water.

Can Guppies live in brackish water?

Guppies are very comfortable in brackish water. In fact, scientific studies have shown that these fish can even live in saltwater.

Do shrimp like this?

Some popular aquarium shrimp species like cherry and Amano shrimps can survive in very low-level brackish water. Ghost shrimp often thrive in brackish aquariums, however.

Expert Take

Brackish is the forgotten middle ground of fishkeeping. Most hobbyists have kept freshwater or saltwater, but very few have built a true brackish system. The challenge is that there is no universal salinity. What works for an archer fish is wrong for a bumblebee goby. Know your target species’ ideal SG before you mix salt. — Mark Valderrama, AquariumStoreDepot

ASD Difficulty Rating: Tier 3 – Advanced — Brackish tanks require regular salinity monitoring, species-matched SG levels, and careful top-off management. More demanding than standard freshwater.

Hard Rule: Every brackish species has a different ideal salinity range. Do not mix species that require significantly different SG levels in the same tank. Match the water chemistry to the most demanding species you plan to keep.

The Reality of Keeping Brackish Fish

Brackish tanks require a hydrometer or refractometer for regular salinity checks. Evaporation raises salinity quickly. Top-off water must always be fresh, not saltwater. Many brackish keepers discover this the hard way when salinity climbs slowly over weeks until fish show stress. This is the most common maintenance mistake with brackish setups.

Is the 15 Best Brackish Water Fish (And Common Mislabeling Explained) Right for You?

Before you add a 15 best brackish water fish (and common mislabeling explained) 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. 15 Best Brackish Water Fish (And Common Mislabeling Explained)s 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 15 best brackish water fish (and common mislabeling explained) 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.

Avoid If:
- You want a set-it-and-forget-it tank (brackish systems require consistent salinity monitoring)
- You are not prepared to measure and maintain specific gravity regularly
- You want to combine many different freshwater species in the same community tank
- You expect the same minimal water chemistry management as a standard freshwater setup
How the 15 Best Brackish Water Fish (And Common Mislabeling Explained) Compares to Similar Species

Choosing between similar species can be tricky. Here’s how the 15 best brackish water fish (and common mislabeling explained) stacks up against some common alternatives.

The 15 best brackish water fish (and common mislabeling explained) 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 15 best brackish water fish (and common mislabeling explained) 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 15 best brackish water fish (and common mislabeling explained) needs, it’s hard to beat. If not, there are usually alternatives worth exploring.

Final Thoughts

Setting up a brackish tank can be a great next step for aquarists looking to expand their collection. The range of different fish that this side of the hobby opens up is really exciting. This is a fascinating side of the hobby that all fish keepers should try out!

Do you keep brackish fish? Tell us about your favorite species in the comments below!
April 30, 2022

5 Main Types of Livebearers: A Beginner’s Guide to Guppies, Platies, Mollies and More

Expert Take | Mark Valderrama — AquariumStoreDepot

Livebearers get recommended to beginners constantly, and for good reason. They are forgiving, colorful, and active. But the part people gloss over is the population math. A single pregnant female guppy can deliver up to 100 fry. If you keep males and females together and you are not actively managing the population, you will have a tank problem within a few months. Plan for it from day one. I have seen more beginner tanks crash from livebearer overcrowding than from almost any other cause.

Livebearers breed constantly, eat their young, and will overpopulate any tank without predation or sex separation. The appeal is obvious. The population explosion that follows is the part nobody warns you about.

If you keep males and females together, you are breeding livebearers. There is no opt-out.

That said, guppies, platies, mollies, swordtails, and Endler’s are some of the most rewarding and colorful fish in the freshwater hobby. Here is what you actually need to know to keep them long-term, including the population management piece that most beginner guides skip entirely.

Key Takeaways

Livebearers give birth to live, free-swimming fry rather than scattering eggs; they will breed without any intervention from you
“Beginner-friendly” means forgiving on water parameters, not zero effort; water quality still matters, and overcrowding is the most common way livebearer tanks fail
Mollies benefit from slightly hard, alkaline water and tolerate low-level salinity; they are the most sensitive of the group to consistently poor water quality despite their hardy reputation
Fancy guppy strains have been selectively bred for appearance, which has reduced hardiness compared to wild-type stock; feeder guppies are often hardier than fancy varieties
The solution to population control is simple: all-male tanks, all-female tanks, or a grow-out tank with a plan for rehoming fry

What Are Livebearers?

Livebearers are fish that internally fertilize their eggs and give birth to free-swimming young rather than scattering eggs to be fertilized externally. Over 300 species qualify as livebearers, but in the aquarium hobby the term almost always refers to the Poeciliidae family: guppies, platies, mollies, swordtails, and Endler’s.

The key biological fact is that a female livebearer can store sperm from a single mating and produce multiple batches of fry without any additional male contact. This means a female bought at a fish store can already be pregnant. She will deliver fry whether or not there is a male in your tank.

These fish are found in Central and South America and the Caribbean, typically in warm, slow-moving freshwater habitats. They have been kept in aquariums for over 100 years and have been selectively bred into an enormous range of color forms, fin types, and body shapes. The hobby versions often look nothing like the wild originals.

Livebearer Difficulty Tiers

Easiest (True Beginner)

Endler’s livebearers, platies, wild-type guppies. Hardy, tolerate a wide pH range, eat anything, small footprint. Population management is the only real challenge.

Easy with Caveats

Fancy guppies, mollies, swordtails. Hardier than most fish but with specific needs: fancy guppies are more disease-prone from inbreeding; mollies need harder water and higher pH than most freshwater fish; swordtails need space and may jump.

Not True Livebearers to Worry About for Now

Goodeids, halfbeaks, and other specialty livebearers require specific conditions and are more advanced. Start with the Poeciliidae family.

The Population Problem Nobody Warns You About

This is the section most beginner guides skip. It should not be skipped.

A female guppy can produce 20 to 100 fry every 4 to 6 weeks. Platies deliver 20 to 50 every month or two. Mollies produce 10 to 60 every 30 to 45 days. These numbers compound quickly. A 10-gallon (38 L) tank with two males and four females becomes unmanageable within 3 to 4 months without active intervention.

The practical options are straightforward:

All-male tank: Beautiful display, no fry, zero population growth. Works great for guppies and Endler’s where males are the colorful sex.
All-female tank: Less colorful, but still active. Keep in mind females purchased from most stores are likely already pregnant on arrival.
Mixed tank with a plan: Set up a small separate tank as a grow-out. Move fry there and find them homes through local aquarium clubs, Facebook groups, or local fish stores that accept donations.

Overstocked tanks lead to elevated ammonia and nitrite, which leads to stressed fish, disease, and die-offs. The population control issue is not just an inconvenience. It is the most common way a livebearer tank becomes unhealthy.

Avoid These Livebearer Mistakes

Keeping mixed-sex livebearers in a 10-gallon (38 L) tank without a population plan; it will overcrowd within months
Keeping mollies in very soft, acidic water long-term; they prefer hard, alkaline water around pH 7.5-8.5 and become more disease-prone in soft acidic setups
Buying fancy guppies expecting the same hardiness as the wild-type; selective breeding for appearance has reduced their overall robustness
Not cycling the tank before adding livebearers; “beginner fish” does not mean “add to an uncycled tank”
Keeping swordtails in an uncovered tank; males jump, especially when chasing females

Male vs. Female: How to Tell Them Apart

Knowing the sex of your fish is essential for population management. The good news is that livebearers are relatively easy to sex once you know what to look for.

Guppies: Males are smaller and dramatically more colorful, with flowing fins. Females are larger, drabber, and noticeably rounder when pregnant.
Endler’s: Same pattern as guppies. Males have bold neon coloring; females are silver-tan and plainer.
Platies: Females have a fan-shaped anal fin and a rounder body. Males have a pointed, narrow anal fin (gonopodium).
Mollies: Same as platies. Female has a fan-shaped anal fin; male has a gonopodium. Females are often larger-bodied.
Swordtails: The easiest to sex. Males have the elongated lower tail ray (the sword) and a gonopodium. Females are rounder and lack the sword.

Aim for a ratio of one male to two or three females when keeping mixed-sex groups. A higher male-to-female ratio leads to the females being harassed constantly, which causes chronic stress and shortened lifespans.

5 Main Livebearer Types

Species	Max Size	Min Tank	pH Range	Fry Per Batch	Hardiness
Guppy	2 in (5 cm)	10 gal (38 L)	5.5-8.0	20-100	Very Hardy (wild-type)
Endler’s	1 in (2.5 cm)	10 gal (38 L)	5.5-8.0	5-25	Very Hardy
Platy	2 in (5 cm)	20 gal (76 L)	7.0-8.2	20-50	Very Hardy
Molly	5 in (13 cm)	30 gal (114 L)	7.0-8.0	10-60	Hardy (needs harder water)
Swordtail	4 in (10 cm)	20 gal (76 L)	7.0-8.3	20-80	Hardy

1. Guppy

Guppy Fish

An undemanding fish that is a livebearer. Many varieties available.

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Scientific Name: Poecilia reticulata
Difficulty Level: Easy
Temperament: Peaceful
Adult Size: 2 inches (5 cm)
Minimum Tank Size: 10 gallons (38 L)
Temperature: 64-82°F (18-28°C)
pH: 5.5-8.0
Breeding Frequency: Every 4-6 weeks, 20-100 fry per batch

The guppy is the most commonly kept freshwater fish in the world. Males carry an extraordinary range of color and fin variations from generations of selective breeding. They survive beginner mistakes that would kill most fish, and they are still one of the better community fish even for experienced hobbyists who want activity and color in a planted tank.

The caveat is that fancy guppy strains have been heavily inbred for appearance. This has reduced their hardiness compared to wild-type or feeder guppies. If you keep losing fancy guppies and cannot figure out why, this is often the reason. Feeder guppies are typically more robust, less colorful, and considerably less expensive.

2. Endler’s Livebearer

Endler’s Livebearers

A very active and colorful livebearer. Smaller than guppies.

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Scientific Name: Poecilia wingei
Difficulty Level: Easy
Temperament: Peaceful
Adult Size: 1 inch (2.5 cm)
Minimum Tank Size: 10 gallons (38 L)
Temperature: 64-82°F (18-28°C)
pH: 5.5-8.0
Breeding Frequency: Every 3-5 weeks, 5-25 fry per batch

Endler’s are closely related to guppies but smaller, more streamlined, and with a slightly different color pattern style. Males are neon and active; females are silver-tan and plain. The smaller batch sizes (5-25 fry versus up to 100 for guppies) make population management somewhat easier in smaller tanks.

One important note: Endler’s and guppies will hybridize freely. If you mix the two species, you will get fertile hybrids that look like a mix of both. Some keepers enjoy this; others who want to preserve pure Endler’s strains should keep them separately. Wild-caught Endler’s are nearly extinct due to habitat destruction, so the aquarium lines are what we have.

3. Platy

Scientific Name: Xiphophorus maculatus
Difficulty Level: Easy
Temperament: Peaceful
Adult Size: 2 inches (5 cm)
Minimum Tank Size: 20 gallons (76 L)
Temperature: 64-77°F (18-25°C)
pH: 7.0-8.2
Breeding Frequency: Every 4-6 weeks, 20-50 fry per batch

Platies are arguably the most beginner-compatible livebearer. They tolerate a wide temperature range (down to 64°F/18°C), prefer the slightly alkaline water that most municipal tap water provides naturally, and are peaceful with virtually everything similarly sized. The wagtail, tuxedo, salt-and-pepper, and rainbow color forms give plenty of variety without needing multiple species.

They produce slightly less waste than mollies, making them appropriate for smaller tanks. Still, a 20-gallon (76 L) is the right starting point for a small group with the understanding that it will need to handle population growth.

4. Molly

Scientific Name: Poecilia sp.
Difficulty Level: Easy with caveats
Temperament: Peaceful
Adult Size: 5 inches (13 cm)
Minimum Tank Size: 30 gallons (114 L)
Temperature: 68-82°F (20-28°C)
pH: 7.0-8.0
Breeding Frequency: Every 30-45 days, 10-60 fry per batch

Mollies have a reputation for hardiness that is partially undeserved. They are hardy when kept in appropriate water conditions. In soft, acidic water, they are significantly more prone to disease, particularly velvet and bacterial infections. Mollies evolved in hard, alkaline, often slightly brackish coastal waters. The aquarium versions tolerate fresh water fine, but they do best with harder water and a pH above 7.5.

The larger size (up to 5 inches/13 cm for common mollies; sailfin mollies can reach 6 inches/15 cm) means they produce considerably more waste than guppies or Endler’s. A 30-gallon (114 L) is the minimum for a small group, and filtration needs to be sized appropriately. Do not put mollies in a 10-gallon (38 L) and expect success.

The saltwater adaptation is real and interesting. Some hobbyists successfully transfer mollies to saltwater or brackish reef setups where they function as algae control. Acclimate slowly over several weeks, not all at once.

5. Swordtail

Scientific Name: Xiphophorus helleri
Difficulty Level: Easy
Temperament: Peaceful (males can be territorial toward each other)
Adult Size: 4 inches (10 cm)
Minimum Tank Size: 20 gallons (76 L) for a small group; 40 gallons (151 L) recommended
Temperature: 64-82°F (18-28°C)
pH: 7.0-8.3
Breeding Frequency: Every 4-6 weeks, 20-80 fry per batch

Swordtails are underused in the hobby. The red swordtail in a planted tank is a genuinely striking fish. Males can be aggressive toward each other (especially in tight quarters), so keep only one male per tank in smaller setups or provide plenty of visual breaks in larger tanks. Swordtails jump. A tight-fitting lid is not optional. The males especially jump when chasing females or competing with other males.

They produce an enormous number of fry. Eighty fry from a single female is not unusual. Plan accordingly. All-male swordtail tanks work well and eliminate the fry problem entirely.

Tank Setup

A cycled, established tank is the starting requirement for all livebearers. “Easy fish” does not mean “add to an uncycled tank.” Ammonia spikes kill livebearers as reliably as any other fish. Run the nitrogen cycle first; add fish after.

Most livebearers prefer the top half of the water column. They are not bottom-dwellers, which means substrate choice matters less for them directly. However, substrate matters for water quality management. Gravel or sand both work fine. Dense planting gives fry hiding spots and makes population management more organic (fry that hide in plants may survive even without a separate grow-out tank).

Filtration should be sized for at least twice the tank volume, and the outlet should not create strong current that small fish like guppies and Endler’s struggle to swim against. A sponge filter works for smaller setups; a hang-on-back or canister with a spray bar works better for larger tanks with mollies and swordtails.

A lid with minimal gaps is important for swordtails specifically and useful for all livebearers. They are not as prone to jumping as some fish, but they do jump.

Feeding

Livebearers are omnivores and will eat essentially anything you offer. A high-quality flake or micro-pellet makes a solid base diet. Supplement with frozen bloodworms, brine shrimp, and daphnia a few times per week to encourage better health and coloration. Mollies especially benefit from some plant matter in their diet; algae wafers or blanched vegetables work well.

For very small fish like Endler’s, break up larger flakes before feeding. Endler’s mouths are tiny and they struggle with standard-sized flakes.

Feed once or twice daily in amounts the fish consume within 2 to 3 minutes. Remove uneaten food to prevent water quality issues.

Tank Mates

Most livebearers are excellent community fish. They pair well with similarly-sized schooling fish like tetras, danios, rasboras, corydoras, and otocinclus. Peaceful gouramis work well with platies, mollies, and swordtails in appropriately sized tanks.

Avoid aggressive cichlids, large predatory fish, and anything that will eat a 2-inch (5 cm) fish whole. Angelfish will eat guppies. Standard cichlids will eat everything. Pufferfish will not leave any livebearer alone. These are not subjective observations; they are reliable outcomes.

Male bettas with livebearers is a judgment call. Female bettas work fine. Male bettas often leave platies and mollies alone but may harass and fin-nip fancy guppies or Endler’s. The long fins on a fancy guppy male look like a betta rival to some individuals. Watch carefully if you attempt this combination.

Breeding

If you keep both sexes, they will breed without any intervention. No special water changes, conditioning food, or breeding tank setup is required. The female carries the developing young internally for 4 to 6 weeks and then delivers live fry.

To maximize fry survival, set up a densely planted tank so fry can hide immediately after birth, or move the visibly pregnant female to a separate small tank before delivery. A gravid spot (dark area near the anal fin) darkens and enlarges as delivery approaches. Remove the female from the fry tank after delivery, as she and other adults will eat the fry.

Feed fry crushed flake food or baby brine shrimp until they are large enough to accept adult food, typically around 3 to 4 weeks of age.

FAQs

Which livebearer is best for a beginner?

Platies are the most forgiving starting point. They tolerate a wide temperature range, prefer the slightly alkaline water most tap water provides naturally, are peaceful with virtually everything, and breed at a manageable rate. Guppies (wild-type or feeder strains) are equally hardy. Start with one sex if you do not want to deal with fry.

Why do my mollies keep dying?

The most common cause is soft, acidic water. Mollies need hard, alkaline water (pH 7.5-8.0) to stay healthy long-term. In soft, acidic water they become susceptible to velvet, bacterial infections, and “molly disease” (a general decline). Check your water hardness and pH. If your tap water is soft and acidic, consider adding crushed coral to the filter or using a buffer to raise pH and hardness.

How do I stop livebearers from breeding?

Keep only males or only females. This is the only reliable method. Keeping a predator in the tank to eat fry works partially but leads to constant stress and is not a sustainable or humane approach.

Can I keep livebearers in a 10-gallon tank?

A 10-gallon (38 L) works for a small group of guppies or Endler’s if you keep one sex only. Mixed-sex livebearers in a 10-gallon will overcrowd within months. Platies, mollies, and swordtails need 20 to 30 gallons (76-114 L) minimum.

Do livebearers eat their fry?

Yes. The female will eat her own fry immediately after delivering them if they are accessible. A densely planted tank gives fry immediate hiding spots that improve survival rates significantly. Moving the female to a separate tank before delivery and returning her after is the most reliable way to save fry.

Closing Thoughts

Livebearers are some of the best fish in the hobby. Hardy, colorful, active, and available in enough varieties to occupy a hobbyist for years. The beginner-friendly reputation is accurate. But “forgiving” is not the same as “maintenance-free.” Water quality still matters. Tank size still matters. And the population math will catch up with you if you do not plan for it from day one.

Go in with a clear plan for fry management and a properly cycled tank, and livebearers will reward you with one of the easiest and most active setups you can run.

Mark’s Pick

For a beginner wanting livebearers without the population headache, I recommend an all-male guppy tank. Pick 6 to 8 males from different color strains, put them in a planted 20-gallon (76 L), and you get all the activity and color with zero fry management. It is genuinely one of the best-looking and lowest-drama setups you can build. Platies are my second recommendation for anyone who wants a mixed community that includes both sexes, as long as they have a plan for the fry.

Where to Buy Livebearers

Livebearers are available at most fish stores, but quality varies considerably by source. Online specialty retailers often have healthier stock with more variety in color forms and strains, and they ship directly from their own holding systems.

Flip Aquatics – Quality livebearers, reliable shipping, good variety across guppies, endlers, and other livebearers
Dan’s Fish – Healthy fish, good selection of freshwater species including livebearers

April 26, 2022

9 Types of Danio Fish: A Guide to the Whole Group (Beyond the Zebra Danio)
Danios are one of those fish groups I’ve always had a soft spot for. they’re fast, hardy, and the group contains a lot more variety than most hobbyists realize. Most people know zebra danios, but there are 9 species worth keeping and each has its own personality and requirements. After 25+ years in the hobby, here are my honest notes on the whole group.

Danios are one of those fish groups that punch above their weight. The common zebra danio is practically bulletproof. it tolerates a wide temperature range, adapts to most water conditions, and its active schooling behavior makes it a useful dither fish for shy or nervous tankmates. But the group goes well beyond zebras: pearl danios, giant danios, leopard danios, and the stunning celestial pearl danio all have their own appeal. After 25 years in the hobby, I still think danios are underrated by intermediate hobbyists who’ve moved past the beginner stage. Here are 9 types worth knowing.

What Are Danio Fish?

Danio fish are some of the most important fish in the aquarium hobby as well as in the scientific world. The most popular species of danio to come across is the common danio (Danio rerio), also known as zebrafish. However, the genus of Danio contains almost 30 different species with 9 of them making their way into the homes of freshwater enthusiasts!

Danio fish are considered to be some of the easiest fish to keep in the home aquarium. Their hardiness and quick reproduction rates have also made them the perfect candidate for use as a model organism for gene sequencing. Specifically, Danio rerio has been used to study drug development, regenerative properties, and other bioengineering practices.

Some of these studies have been taken advantage of by the aquarium industry, creating fluorescent varieties of danio called GloFish. These fish have been genetically prioritized to express neon colors of red, green, yellow, and more. Once these genes are expressed, they will continue to be passed onto later generations of danio, meaning that there is no cruel practice involved. Sadly though, there are many breeders that dye their fish for brighter and more appealing colorations.

Top 9 Types of Danios Best Suited For Aquariums

In the freshwater aquarium hobby, danios are seen as beginner fish. They don’t require a lot of room to thrive and can bring a ton of activity to the top portions of the tank. Though common zebra danios are the most popular fish species available, there are actually 8 other varieties that can bring new life to a tropical setup.

We have a video just for you from our Aquarium Store Depot YouTube Channel. We go into more detail in our blow post below. If you enjoy our content, please subscribe as we post new videos each week! Let’s start with the first on the list!

1. Celestial Pearl Danio

Celestial Pearl Danio

A great-looking danio fish. Males are more colorful than females. A midway dwelling fish

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- Scientific Name: Danio margaritatus
- Difficulty Level: Moderate
- Temperament: Peaceful
- Adult Fish Size: 1 inch
- Minimum Tank Size: 10 gallons
- Diet: Omnivorous
- Origin: Burma
- Temperature: 65-80°F
- pH: 6.5-7.5
- Difficulty to breed: Moderate
- Planted tank suitability: Common
Sometimes wrongly referred to as galaxy rasboras, celestial pearl danios belong to the Danio genus along with the other fish species on this list. These fish are a recent addition to the aquarium hobby, almost causing them to become endangered shortly after their discovery in 2006. Their spotted trout-like appearance has made them a favorite, yet expensive, staple to the planted aquarium.

Celestial pearl danios come from very specific ecosystems at high altitudes in Hopong, Burma. They can be found in large groups, which needs to be replicated in the aquarium setting by keeping at least 6 members at all times; ideally, these fish should be kept in large groups starting with 20 individuals.

Celestial pearl danios can be slightly more challenging to keep as they are not very hardy fish and succumb to imperfect or irregular water conditions. They also do better in cooler water temperatures, making them incompatible with other species.

2. Zebra Danios
- Scientific Name: Danio rerio
- Difficulty Level: Easy
- Temperament: Peaceful
- Adult Fish Size: 3 inches
- Minimum Tank Size: 10 gallons
- Diet: Omnivorous
- Origin: Pakistan, India, Bangladesh, Nepal, and Myanmar
- Temperature: 64-75°F
- pH: 6.5-7.5
- Difficulty to breed: Easy
- Planted tank suitability: Common
Zebra danios are arguably the most popular and available fish on this list. These are incredibly active fish that earn their name from the horizontal black and yellowish-silver stripes that run from their heads to their tails.

In the wild, the Zebra danio fish are found in a wide range of ecosystems from stagnant waters to fast-moving mountain streams. Most of these environments have cooler water temperatures than typical tropical fish, which will need to be replicated in the aquarium.

The zebra danio is a schooling fish and will need to be kept in groups of at least 6 or more. Due to their activity and tendency to stay towards the top of the tank, schools can quickly become overwhelming for other fish as well as for other danios. Because of this, it’s recommended to keep smaller schools with other species that stay toward the bottom of the aquarium.

3. Gold Longfin Danio
- Scientific Name: Danio rerio
- Difficulty Level: Easy
- Temperament: Peaceful
- Adult Size: 3 inches
- Minimum Tank Size: 10 gallons
- Diet: Omnivorous
- Origin: India
- Temperature: 64-75°F
- pH: 6.5-7.5
- Difficulty to breed: Easy
- Planted tank suitability: Common
The gold longfin danio (video source) is a more colorful variation of the common Danio rerio. These types of danios naturally occur in the Ganges region in Eastern India, though the aquarium hobby has enhanced their coloration and finnage.

The gold longfin danio is named after its bright yellow body with white stripes. Compared to other species, they also have noticeably longer fins. In terms of care requirements, they have the same needs as regular Danio rerio fish.

4. Gold Ring Burmese Danio

Gold Ring Danio

A golden-colored Danio Fish that only grows to 1.5 inches. A highly adaptable fish

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- Scientific Name: Danio tinwini
- Difficulty Level: Easy
- Temperament: Peaceful
- Adult Size: 2 inches
- Minimum Tank Size: 10 gallons
- Diet: Omnivorous
- Origin: Myanmar
- Temperature: 64-75°F
- pH: 6.5-7.5
- Difficulty to breed: Easy
- Planted tank suitability: Common
Though similar in name to the gold longfin danio, the gold ring Burmese danio (video source) is a species all of its own. Instead, these unique fish are named after the leopard-like black spots that cover their pale yellow body. They are especially identifiable by their opaque white abdomen.

https://youtu.be/gT0X7RLFCpc

Gold ring danios have the same behaviors and care requirements as zebra danios, but are slightly smaller. Though an inch difference might not seem like a lot, these fish are that much more susceptible to bullying and strong water currents. Still, the best tank mates for gold ring danios will be other types of danio and slow-moving fish species.

5. Glowlight Danio

Glowlight Danio Near Gravel” class=”wp-image-557066″/>
- Scientific Name: Celestichthys choprae
- Difficulty Level: Easy
- Temperament: Peaceful
- Adult Size: 1.5 inches
- Minimum Tank Size: 10 gallons
- Diet: Omnivorous
- Origin: Myanmar
- Temperature: 64-75°F
- pH: 6.5-7.5
- Difficulty to breed: Easy
- Planted tank suitability: Common
Not to be confused with GloFish danios, glowlight danios are very unique fish. They’re not even true danios and belong to the Celestichthys genus instead!

These fish are extremely colorful with a yellow-based body with vertical blue stripes and a pink stripe leading to their tail. They are also much smaller than the other types of danios on this list, but one of the more expensive varieties.

Glowlight danios are very tight schoolers and will thrive in large groups. They are more likely to venture to lower portions of the other tank than other species, so it’s important to keep their activity levels in mind when stocking.

6. Pearl Danio
- Scientific Name: Brachydanio albolineatus
- Difficulty Level: Easy
- Temperament: Peaceful
- Adult Size: 2 inches
- Minimum Tank Size: 10 gallons
- Diet: Omnivorous
- Origin: Myanmar, Sumatra
- Temperature: 73-77°F
- pH: 6.5-7.5
- Difficulty to breed: Easy
- Planted tank suitability: Common
The pearl danio, also known as the blue danio or turquoise danio, is a plain iridescent fish. While they may not be the most colorful species on this list, their simplicity catches the eye in a well-planted aquarium.

Pearl danios have the same care requirements and behaviors as other danios and will do best when kept in small groups. It is important to note that pearl danios need a slightly higher water temperatures than other types of danios that can tolerate cold climates.

7. Leopard Danio
- Scientific Name: Danio frankei
- Difficulty Level: Easy
- Temperament: Peaceful
- Adult Size: 3 inches
- Minimum Tank Size: 10 gallons
- Diet: Omnivorous
- Origin: India
- Temperature: 64-75°F
- pH: 6.5-7.5
- Difficulty to breed: Easy
- Planted tank suitability: Common
The leopard danio is very close in appearance to the gold ring Burmese danio, though they’re not related. Leopard danios have slightly more streamlined bodies and much smaller bluish-black spots on a light yellow body. Some of these spots transfer onto the fins.

Unlike other danios, the leopard danio fish occurs in slow-moving or stagnant waters. However, they appreciate some water flow in the aquarium setting. Like the others, they appreciate being in small groups in vegetative setups.

8. Giant Danio

Giant Danio Fish in Aquarium” class=”wp-image-557080″/>
- Scientific Name: Danio aequipinnatus
- Difficulty Level: Easy
- Temperament: Peaceful
- Adult Size: 4 inches
- Minimum Tank Size: 30 gallons
- Diet: Omnivorous
- Origin: India, Nepal
- Temperature: 72-75°F
- pH: 6.0-7.0
- Difficulty to breed: Easy
- Planted tank suitability: Common
Though called giants, giant danios are only about an inch bigger than other species of this fish. However, this potential size is enough to make their minimum tank size a little bigger than the others to allow for growing room and space to swim. They also prefer slightly warmer water temperatures and a lower pH.

These aquarium fish are plain in color, but beautiful upon a closer look. They have pale bodies with highlights of light blue. Paired with their activity level, they can create contrast against a planted background in a large group.

9. GloFish Danio
- Scientific Name: Danio rerio
- Difficulty Level: Easy
- Temperament: Peaceful
- Adult Size: 2.5 inches
- Minimum Tank Size: 10 gallons
- Diet: Omnivorous
- Origin: Captive-bred
- Temperature: 64-75°F
- pH: 6.5-7.5
- Difficulty to breed: Not permissible
- Planted tank suitability: Common
GloFish are highly fluorescent types of danio. This trait has been inherited through the generations and patented by the GloFish company, making it illegal to breed them. However, they are widely available in most aquarium stores and can make a fun and unique addition to a blacklight freshwater setup.

It is important to purchase only GloFish (certified danio fish as others could be cruelly dyed with artificial colors. GloFish danio colors include Starfire Red®, Electric Green®, Sunburst Orange®, Cosmic Blue®, and Galactic Purple®.

Danio Tank Setup

The best thing about danios is that they will thrive in most tank setups, anything from a simple 10 gallon tank with colorful decorations to a 100 gallon system with the rarest freshwater plants. As long as water parameters stay stable and in their preferred range, these fish will thrive.

Substrate & Decorations

Danio fish can be kept on gravel or sand. They do not regularly venture towards the bottom of the tank, which nearly eliminates the threat of long fins getting tugged or bodies getting scratched. If you find that your fish is laying towards the bottom of the aquarium, check water parameters immediately as this could be a sign that something is wrong.

Otherwise, danios do not need an elaborate setup. They will do well in a barebones aquarium with simple decorations. If you really want to treat your fish though, provide easy floating plants that they can pick at for food and hide in at the surface of the water.

A fully planted setup will make these simple and peaceful fish shine even more.

Lighting & Filtration

Lighting will largely depend on the types of plants being kept in the aquarium. Danios do not need any specific lighting, though GloFish will glow best under a blacklight; don’t be tricked into buying a special aquarium blacklight as any one will work.

An important thing to remember is that these fish stay towards the top of the aquarium. If using a high-intensity light for red and foreground plants, make sure to provide your fish with some coverage that they can escape to if the light becomes too much.

Though danios aren’t the messiest fish, they can start to create large amounts of waste when kept in big groups. It is always recommended to have a filter that is rated for at least twice the size of the aquarium, with bigger being better. In most cases, you can’t overdo good filtration for danios as they’ll appreciate the extra water flow. A simple power filter should do the trick for a danio tank.

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Heating

Danio fish are considered a coldwater species. They can tolerate significantly colder water temperatures than typical tropical fish. However, most of these fish have been bred in the aquarium industry and have acclimated to average water conditions.

When buying your danio, it is best to ask what temperature they are being kept at and match those parameters.

Do Danios Need A Heater?

Being a coldwater fish, danios do not necessarily need a heater. If ambient room temperature constantly stays in the same range as the preferred one of your danio, then you don’t need a heater.

However, a heater is always recommended for any tank setup. This is because temperatures can easily fluctuate throughout the day enough to cause stress on your fish. For that reason, danios should always have a heater to keep temperatures constant rather than to raise the temperature.

How To Care For Danio Fish

Danio care is simple and straightfoward. Once the tank is cycled and the fish are safely acclimated, there’s little to worry about going wrong. The biggest concern will be keeping these active aquarium fish fed and choosing the right tank mates.

Aquarium Maintenance

Danio aquarium maintenance is no different from any other fish though the frequency will depend on the parameters of your system. This usually means a 20-25% water change every time nitrates creep over 50 ppm. For most hobbyists, this is every week or every other week depending on the bioload and size of the aquarium.

Along with water changes, the substrate should be vaccuumed regularly to keep detritus from building up.

Danio Behavior & Feeding

No matter which species of danio you choose, your danio fish will be the most active in the whole aquarium. These fish love to swim towards the surface of the water, searching for food and following the rest of the school. Most species of danio are very tight schoolers and will form groups that change direction all at once.

If you find that your danios are not schooling, try adding more plants or more danios. It is possible that your fish are trying to hide due to lack of coverage or safety in numbers. To help your fish be more active, make sure to feed regularly. More activity means a higher metabolism that needs to be kept up with.

In the wild, danios are mainly insectovores; this is part of the reason they stay right under the surface of the water to catch any bugs that might land. In the aquarium setting, they have adapted to an omnivorous diet and will accept most frozen, freeze-dried, and live foods. They will especially enjoy bloodworms and mosquito larvae.

The staple of their diet should be a high-quality fish flake food or pellet; flakes will stay on the surface while pellets will sink out of reach of your fish. To meet their vegetation needs, you may provide algae flakes and pellets or offer blanched vegetables from time to time. A good staple food to buy is Xtreme Aquatic Foods Nano.

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Danio Tank mates

Most danios are plain in color. While they can bring a lot of activity to the tank, they’re not usually the centerpiece of the system. Instead, their simple colors can be used to accent other aquarium fish.

Some of the best danio tank mates will prefer cooler temperatures and stay away from the upper portions of the tank. Some ideal species would be:
- White cloud mountain minnows
- Corydoras
- Tetras
- Gouramis
- Angelfish
Danios can also safely be kept with most invertebrates and can even be paired with dwarf crayfish as they both stay at the extreme ends of the tank.

How Many Danios Should Be Kept Together?

No matter which species of danio you choose, you will need to keep them in a school. Danios are schooling fish and should never be kept by themselves.

Ideally, at least 6 danios should be kept together at all times. From there, tank size will determine the maximum number possible.

Tank Mates To Avoid

There aren’t many tank mates you should avoid in a danio tank. The biggest concern will be having your fish eaten by something that has a bigger mouth.

In general, this includes:
- Cichlids
- Oscars
- Discus
- Aggressive barbs
Danio Breeding

Danios are some of the easiest freshwater fish to breed and are a perfect challenge for beginners. As long as water parameters are stable, diet is high-quality, and a male and female are available, then these fish will spawn in your freshwater aquarium without any additional effort.

Danios are egg scatterers and will not take care of their young. Once the eggs have been fertilized, they are likely to be eaten by other fish. To increase the odds of eggs surviving, remove the eggs or install an eggcrate that blocks the other fish from getting to them.

The eggs will hatch after a day or two and the fry will be free-swimming. At this point, the fry can also be removed for greater chances of success. Feed small foods, like baby brine shrimp, regularly until they’re able to accept a larger variety.

Final Thoughts

Danio fish are shrugged off as an easy beginner fish that doesn’t add much to the aquarium. Most hobbyists forget that there are many different types of danio available that don’t need any extra care! It’s just a matter of picking out which one you like best.

📘 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.
April 25, 2022

Tag: Freshwater Fish Profiles

Rummy Nose Tetra: Complete Care Guide (And Why Their Color Tells You Everything)

Table of Contents

What Most Care Guides Get Wrong About Rummy Nose Tetra

The Reality of Keeping Rummy Nose Tetra

Biggest Mistake New Owners Make

Species Overview

Classification

What Are Rummy Nose Tetras?

Origin and Habitat

Appearance

Types

The True Species: Hemigrammus rhodostomus

The Brilliant or The Common: Hemigrammus bleheri

The false Kind Petitella georgiae

Average Size and Lifespan

Care Guide

What People Get Wrong

Aquarium Setup

Tank Size

Water Parameters

Filtration and Aeration

Lighting

Aquatic Plants and Decorations

Substrate

Tank Maintenance

Community Tank Mates

Incompatible Tank Mates

Breeding

How do you raise the Fry?

Food and Diet

How Often Should You Feed Rummy nose?

Common Health Problems and Diseases

Dropsy

Ich or White spot Disease

Differences Between Male and Female

Where to get the best quality from?

Where to Buy

FAQs

Is the Rummy Nose Tetra Right for You?

What It Is Actually Like Living With Rummy Nose Tetra

How the Rummy Nose Tetra Compares to Similar Species

Final Thoughts

Recommended Video

12 Easiest Fish to Take Care Of: My Top Picks for Beginners After 25 Years

Key Takeaways

12 Easiest Fish to Take Care Of

1. Betta Fish

2. White Cloud Minnows

3. Danios

4. Endler’s Livebearer

5. Kuhli Loach

6. Bristlenose Pleco

7. Harlequin Rasbora

8. Corydoras Catfish

9. Cherry Barbs

10. Red-Eye Tetra

11. Siamese Algae Eater

12. Black Neon Tetra

Fish That Aren’t Actually Beginner Fish

Quick Comparison: Best Beginner Fish by Setup

Frequently Asked Questions

Closing Thoughts

8 Types of Oscar Fish: Varieties, Care Requirements, and What to Expect

Key Takeaways

Oscar Fish Overview

Oscar Fish Care Requirements

Tank Size

Filtration

Natural Habitat

Live Plants

Temperament and Behavior

Tank Mates

Diet

8 Types of Oscar Fish

1. Tiger Oscar

2. Red Oscar

3. Albino Oscar

4. Lutino Oscar

5. Black Oscar