Paradise Fish Care Guide & Species Profile

Paradise fish (Macropodus opercularis), also sold as paradise gourami, are hardy air-breathing gouramis from southern China, Taiwan and Vietnam. Males grow to about 2.5 to 3 inches and fight each other, so keep one male per tank. Give them a planted tank of 20 gallons or more at 61-79°F (16-26°C); many need no heater.

Last updated: October 18, 2026. Facts checked against the sources listed at the end of this article.

Most people pick fish for their aquarium based on appearance.

Paradise fish initially appeal to people because of their red and blue stripes, but as they are gouramis, people are put off by their aggressive behaviors.

So should you avoid this fish because of its aggression or does their appearance make up for it?

This guide will help you answer this question and more. We will discuss their ideal tank conditions, suitable tank mates, how to breed them, and more…

Paradise Fish Facts & Overview

Paradise fish (Macropodus opercularis) are a freshwater species belonging to the Osphronemidae family. They are a type of gourami so they are also known as paradise gourami.

They’re native to East Asia: China south of the Yangtze, Hainan, Taiwan, and northern and central Vietnam, with Seriously Fish also listing northeastern Laos. Here you can find them in most bodies of freshwater.

People are often put off this species because of their aggressive nature. They can be quite difficult to handle so it’s best to have a little experience before adding some to your tank.

Nowadays there are other colorful gourami that are far more peaceful, so the popularity of this species has dropped. It’s worth trying to brave their aggression though, you’ll get an attractive fish covered in bright colors and striking designs. They introduce more activity into the tank with some interesting behaviors too.

Healthy individuals cost around $5, it shouldn’t be too difficult to find some. If they are healthy then they could live up to 8-10 years.

Typical Behavior

Behavior can vary between individuals, but they’re relatively social and active animals. Unlike most other gourami, the paradise variety is particularly aggressive.

Most of this aggression is focused on individuals of the same species, but sometimes other fish get caught in the crossfire.

Fighting can lead to physical damage and health problems, some cases could be fatal.

Watch out for mating behaviors as these are usually a trigger for fighting. Males are the most aggressive and will compete for females, so males should be kept separately. Territory can be an issue as well, but this will just be a case of chasing intruders away.

Fights are intermittent and shouldn’t be a constant worry on your mind. Most of the time they’ll just be swimming around the middle and upper levels of the tank.

Sometimes you’ll see them swim up to the surface, this is to breathe. Most fish use gills to extract oxygen from the water, but some (like paradise fish) have a labyrinth organ that lets them breathe air.

Appearance

These fish are a colorful choice. They have vivid blue and red stripes that run across their body. The fins don’t tend to have this design, instead they are generally one color. The caudal fin is generally orange.

You may find small black/blue spots scattered across the body.

During mating colors will intensify. The quality of their environment can influence their color too.

This will happen when fighting too, but for a shorter amount of time. The blues will get darker, they’ll extend their fins, and open up their operculum (flap that covers the gills) to look threatening.

It’s not too hard to sex paradise gourami. Males are larger and much more colorful; they’ll develop longer dorsal/anal fins too. Females are duller and smaller, but will grow in size when storing eggs.

Individuals will reach around 2 inches, but sometimes they can grow larger in healthy environments. Their body is sleek with a rounded head. Attached to the body are long flowing fins that can take a few different forms. The caudal fin is the most variable. Usually it’s forked, but it can be rounded or come to a point.

Since these fins are so large they can easily be bitten by fin-nipping fish, so keep them separately.

Habitat and Tank Conditions

Recreating the tropical waters of a paradise gourami’s natural habitat is key to keeping stress levels low in the tank.

Across Asia, they’re usually found in slow-moving, shallow waters, that can vary in condition. This means a wide range of pH and temperature. Something that’s a little more consistent is the abundance of vegetation. These fish prefer densely planted environments that offer both food and shelter.

The bottom of the river or lake would be covered in a sandy substrate with rocks and debris sitting on top (though gourami don’t spend much time interacting with these).

Tank Conditions

When designing any aquarium, you need to think about the needs of your fish.

As fish that swim in the upper levels of the tank, the type of substrate you use isn’t that important. A sandy substrate would most closely resemble their natural habitat.

The plants are a lot more important. Your tank needs planted areas to act as hiding spots.

Hornwort is a good option since it can cope with being eaten now and then. It can be used as a floating plant too which adds a little variety.

You can use rocks to make some caves along the bottom of the tank, but they’ll be empty most of the time.

Keep the tank clean and keep nitrate levels as close to zero as possible by performing 25% water changes every couple of weeks.

Keep the temperature between 61-79°F (16-26°C); paradise fish handle cool water well, and Seriously Fish suggests they benefit from a cooler period in winter. pH can be slightly acidic or alkaline (6-8), but extremes can’t be reached. Hardness should be 5-20 dGH.

You don’t need any special equipment, just a filter and a heater if the room gets colder than about 61°F (16°C). Some people add air pumps to their tanks, but this isn’t important because these gourami aren’t used to strong currents and get some oxygen from the air at the surface.

What Size Aquarium Do They Need?

Paradise fish need at least a 20 gallons tank. If you are keeping a small group you will need a 30 gallon tank.

How Many Can Be Kept Per Gallon?

Each paradise fish would need 5 gallons after the 20 gallons for the first fish. For example in a 30 gallon tank you could have 3 paradise gouramis.

Tank Mates

These fish don’t get along well with others, particularly if they’re a similar size or smaller.

They need to be the dominant species in the tank, if you add other aggressive fish then they will compete for control. This will either lead to fights and physical damage, or your paradise fish will hide and live in stress.

As a result, your options for tank mates are limited. Some people choose to keep a species tank to avoid risking incompatible tank mates, but there are a few options available for community aquariums.

The fish you add need to be bigger and peaceful. Other gourami species, like pearls or dwarfs, are a risk: Seriously Fish advises against similarly shaped tank mates. Large goldfish (like comets) shouldn’t be attacked, as well as geophagus cichlids.

Tough cyprinids like bala sharks or large characins will be able to look after themselves too. Fish that live lower down in the tank are more likely to be ignored by paradise fish, but they still need to be big. Loaches and catfish both fit in this category.

You can try bristlenose or cuckoo catfish and yo-yo or clown loaches.

A general rule is to avoid slow swimmers and fish with long fins that can get bitten. This rules out most fancy goldfish.

Adding shrimp or snails can be risky, some individuals will eat them and others won’t. It’s best not to add any if you’re worried about losing them.

Keeping Paradise Fish Together

You can keep these fish in groups, but you need to be able to sex them. Males will fight so only keep one per tank, the rest will have to be females.

They don’t need to be kept in groups though, they’ll be happy living singly. It’s thought that a male is more active on its own rather than in a group.

Paradise Fish Diet

As omnivores, paradise fish will eat lots of different types of foods.

Even though they will eat both plant and animal matter, they should be given a high protein diet. If you want to feed them vegetation, make sure it’s in addition to meats.

Live and frozen foods are a good way to introduce protein into their diet. Things like brine shrimp, mosquito larvae, and bloodworms will be happily accepted.

There are lots of choices for vegetation. Algae wafers and green vegetables are fine. You can even make your own homemade foods.

Your plants could get attacked from time to time but they should survive, especially if you’ve picked a hardy species.

Store-bought flake and pellet foods are easy to find, cheap to buy, and designed to contain a balanced diet.

Twice a day, feed your fish whatever they can eat within a couple of minutes. Breaking up the feeds makes it easier on their digestive system. Remove any excess food to prevent it rotting in the tank and hurting the water quality.

Care

Knowing how to clean your tank is crucial when caring for fish. Poor water quality or excessive algae are a couple of the leading causes for fish disease.

Paradise gourami can get diseases just like any other fish. One that aquarists sometimes see soon after getting them is lymphocystis disease. Pin-pricks growths start to form on the fins. Sometimes this is mistaken for ich (which causes white spots across the body).

It’s usually triggered by stress and eventually the fish will be unable to swim.

Bacterial diseases can become a problem too, like fin rot or dropsy (which causes bloating). Antibacterial treatments are available to treat them.

Most of these diseases can be avoided by keeping the water conditions optimal, carrying out regular water changes and ensuring the fish aren’t stressed.

These fish are quite a hardy species, so they can fend off disease better than others. Constipation can be a problem if you feed them too much or use low quality foods, so stick with the diet advice above to ensure they don’t become constipated.

Signs of constipation include stringy feces, lethargy, lack of appetite and difficulty swimming.

Breeding

This species can be bred in captivity very easily.

Like bettas and other gourami species, paradise fish are bubble nest builders. A male blows bubbles which float up to the surface; a big enough collection forms a nest. Each bubble is coated in saliva to make them more durable.

A good nest attracts females because they are a safe place to lay eggs. You can tell when a female is ready to mate because they’ll look plump as they fill with eggs.

You will see the male try to court the females, which can lead to some interesting displays. The male will wrap himself around the female a number of times, similarly to when Betta fish breed.

During the process the female will lay eggs, which normally float up to the nest. The pair will repeat this until all the eggs are laid, this can take anywhere from ten minutes to a few hours.

Once the eggs are all safe in the bubble nest, the fry usually hatch in about 3 to 4 days.

Seriously Fish advises removing the adults once the fry are swimming freely, because the male loses interest in the brood at that point. They will become very protective over the nest which could mean they will attack the females. They are prone to eating the fry once they have hatched too.

Alternatively you can use a separate tank of around 10 gallons to raise the fry.

If your fish are stressed, then they won’t mate. To eliminate stress you need to do the things that we’ve already mentioned in other sections; keeping the tank clean, feeding the fish a healthy diet and making sure they don’t have any diseases.

Frequently Asked Questions

How aggressive are paradise fish?

Paradise fish can be quite aggressive, and most of the aggression comes from males. FishBase notes that males fight each other, and Seriously Fish describes males as territorially aggressive, more so when breeding. Keep one male per tank, ideally with two or more females, and avoid small or long-finned tank mates.

Can paradise fish live in a community tank?

Yes, with care. Seriously Fish says peaceful schooling fish with similar water needs can work, but similarly shaped fish, such as other gouramis, should be avoided. Avoid small fish and slow, long-finned fish, add plenty of plants, and keep only one male.

Is a paradise fish a betta?

No. The paradise fish is Macropodus opercularis and the betta is Betta splendens, two different species. They are related: the FishBase entry for Betta splendens places it in the same family, Osphronemidae, and both are air-breathing labyrinth fish whose males build bubble nests and fight each other.

How big do paradise fish get?

Most paradise fish reach about 2 inches (5.5 cm), the common length listed by FishBase. The largest males are bigger: FishBase records 6.7 cm (2.6 inches) and Seriously Fish gives 80 mm (3.1 inches), both measured as standard length, which leaves out the tail fin. Females stay smaller than males.

How big of a tank does a paradise fish need?

A 20-gallon tank is a sensible minimum for one paradise fish. Seriously Fish suggests a tank of at least 80 by 30 cm (about 32 by 12 inches, roughly 72 liters or 19 gallons) for a single pair. Add about 5 gallons for each extra fish, and keep the tank densely planted.

How do you tell if a paradise fish is male or female?

Males are larger and more colorful than females, with longer dorsal, anal and tail fins. Seriously Fish notes that males have extended soft rays in those fins, while females are smaller, duller and look plump when they are carrying eggs.

Are Paradise Fish Suitable for your Aquarium?

Yes, if you can give them a species tank or a community of large, peaceful fish, with plenty of plants and only one male.

Usually small fish can be added to most community aquariums because they’re not aggressive to tank mates, but paradise fish don’t fit this trend.

If you want to keep paradise fish then your tank needs to be species specific or a community of large, peaceful fish. Any smaller fish will be attacked.

Other than this, setting up a tank with these fish is fairly straightforward. They’re not fussy eaters and they only need some plants to keep them happy.

They will flourish when kept in a healthy environment, showing off their colors and social behaviors.

How do you deal with paradise fish aggression? Let us know in the comments section below…

Sources

• Seriously Fish: Macropodus opercularis (distribution, habitat, 80 mm SL, 10-22°C, pH 6-8, 5-20 dGH, tank size, behavior, sexing, 3-4 day hatching). Read October 18, 2026.
• FishBase: Macropodus opercularis (distribution, 6.7 cm SL maximum, 5.5 cm common length, 16-26°C, pH 6-8, dH 5-19, males fight). Read October 18, 2026.
• FishBase entry for Betta splendens: Betta splendens (family Osphronemidae, air breather, bubble nest builder). Read October 18, 2026.