Paradise Betta: Care, Tank Size & Varieties

Many people know betta fish from pet-store displays, where they sit alone in tiny cups because males fight each other. That reputation for aggressive fighting is partly deserved. Bettas are territorial, and they flare their gills and fins when they feel their space is threatened, especially around other bettas and above all other males.

“Paradise betta” is not a separate species. It is a market name that gets used two ways: as a loose label for the colorful, selectively bred Betta splendens sold in stores, and as another name for the mustard gas betta, a bi-color variety. It is also easy to confuse with the paradise fish (Macropodus opercularis), a different fish from East Asia that is not a betta at all.

Whichever fish you mean, the care is the same: a heated, filtered tank of at least 5 gallons (10 is better), water around 78-80°F, a gentle current, and no other male bettas. Never keep a betta in a bowl.

Paradise Betta Facts & Overview

The genus Betta contains roughly 78 recognized species, but only Betta splendens and its many man-made varieties are common in the aquarium trade. Wild B. splendens come from central Thailand and the surrounding region of Southeast Asia, and the name “Siamese fighting fish” dates from when Thailand was called Siam. In the wild, bettas live in shallow, slow or still, warm water: ditches, pools, streams, and rice paddies.

Bettas are intelligent for their size. Keepers commonly report that they learn feeding routines, follow a finger along the glass, and can be taught simple tricks. They also react to people they see often.

Their aggression is mostly territorial rather than random. They defend space, and the main targets are other male bettas and fish that resemble them, such as fish with long, flowing fins or bright colors.

Typical Behavior

Bettas are labyrinth fish. The labyrinth is a folded organ above the gills (not a lung) that lets them gulp air at the surface. It lets bettas survive in low-oxygen water, which is why many people wrongly think a bowl with no filter or heater is acceptable.

Pro tip: The labyrinth organ does not make a bowl suitable. Bettas are tropical fish that need warm, filtered, cycled water and enough room to swim.

Bettas are active, curious fish with real appetites. They patrol the tank, explore plants, and come to the front glass when you approach.

A male in a tank with another male will fight, and injuries and death are likely. Their gills and fins flare when they feel threatened. With the right setup (no rivals, hiding places, plenty of space), most of that aggression disappears.

What Do Paradise Bettas Look Like?

Selectively bred bettas reach about 2.5 to 3 inches (6 to 7.5 cm) including the tail. The body is small compared with the long, wide fins. Males flash brighter colors when they are courting or when they feel challenged.

How Can You Tell Male and Female Bettas Apart?

The easiest sign is the fins. Males have much longer, larger fins and brighter color. Females have shorter fins and are usually duller. Females also tend to look rounder in the belly, and they show a small white egg spot (the ovipositor) just behind the ventral fins, although this varies by individual.

What Types of Paradise Bettas Are There?

Selectively bred bettas are classified by color, tail type, and pattern. Because they were all bred for appearance, none of these types exist in the wild.

What is the mustard gas betta? This is the variety most often called the “paradise betta.” Mustard gas bettas are bi-colored, with a darker body (usually blue or green) and lighter yellow or orange fins. It is a color form, not a species, and the name is mostly a marketing label. Some fish sold as mustard gas are only look-alikes with a similar color split.

Other color types include:

Black Orchid Betta: The black orchid betta is very dark, and may have blue or purple highlights.

Blue Betta: Blue bettas come in a variety of blue hues, including iridescent.

Green Betta Fish: Green bettas usually have a turquoise hue and sometimes look iridescent. They are less common than red and yellow bettas.

Pink Betta Fish: These are often nearly translucent, but sometimes have a brighter pink hue, with purple, red, or white highlights.

Purple Betta Fish: Purple bettas have a violet or bluish-purple hue that can vary across the body.

Red Betta Fish: This is the most common betta color, in many different shades of red.

Rose Petal Betta: This type shows a range of colors from light blue to dark blue to copper, usually with a darker face.

Yellow Betta Fish: Also common, in shades from soft to bright yellow.

White Betta Fish: An all-white betta can look striking, especially combined with a distinctive tail shape.

Captive bettas are also classified by tail type (size and shape):

Crowntail Betta: Named for the spiky, crown-like extensions in its fins. It is a popular and relatively recent variety. Females have shorter tails and lighter colors than males.

Delta Tail Betta: A large, uniform tail that resembles the Greek letter delta. It is narrow toward the body, and the edges are wider, so it looks like a triangle.

Double Tail Betta: A double tail has two distinctly separate tail lobes.

Elephant Ear Betta: Also known as the dumbo betta, this betta is named for its large pectoral fins rather than its tail.

Halfmoon Betta: The tail spreads into a half-circle (180 degrees). The heavy fins make these fish weaker swimmers, so give them very gentle flow.

Plakat Betta: A short-finned variety. Plakats were originally bred for fighting, and they look closest to wild bettas.

Rosetail Betta: Similar to the halfmoon, but the fin exceeds 180 degrees and overlaps itself like a rose.

Veiltail Betta: The most common tail type in pet stores. The male has a long, flowing tail that hangs downward, while the female has shorter fins. Cheap veiltails are often inbred and can have health problems.

Finally, there are color patterns on the body and fins. These come from years of selective breeding.

Butterfly Betta: A solid body color with a pale or iridescent band at the base of the tail and fins, and translucent or white fin edges.

The Dragon Scale Betta: A deep-colored body with thick, iridescent scales that look like armor.

Koi Betta: Bred to look like a koi pond fish, and a variation of the marble betta.

Marble Betta: Light or pale bodies with deeper colors in a marbled pattern. The pattern can change over time.

What Tank Setup Does a Paradise Betta Need?

Start with the location. Bettas dislike loud noises and constant vibration, so put the tank in a quiet area. They also jump, so you need a tight-fitting lid with a small gap for air.

Use a soft substrate such as fine gravel or sand, about an inch or two deep. Rough substrate and sharp decorations tear long fins. A quick test: if a decoration snags a stocking, it can snag a fin.

Use a filter, but choose a sponge filter or an adjustable-flow filter. Bettas have long fins and cannot handle a strong current. You can also baffle the outflow or place a plant in front of the filter intake to disperse the water flow.

Moderate lighting on a regular day/night schedule works well. Avoid direct sunlight, which overheats the tank and grows algae. Floating plants dim the light and give the fish somewhere to rest at the surface.

You will also need a submersible heater, because bettas are tropical fish. Keepers often find that bettas become sluggish at normal room temperatures (67-69°F).

Live plants such as java fern or anubias are a good choice. They help take up nitrate, and unlike some stiff artificial plants, they won’t scratch fins. If you use artificial plants, choose silk.

What Water Conditions Do Paradise Bettas Need?

Consistency matters more than hitting one exact number. Sudden swings, even within the acceptable range, can cause illness or death. Always dechlorinate tap water, because chlorine and chloramine are harmful to bettas.

Recommended parameters:

• Temperature: 76-82°F (24-28°C), ideally steady around 78-80°F. The species tolerates about 72-86°F.
• pH: 6.0-8.0, with 6.5-7.5 ideal
• Hardness: 1-15 dGH
• Ammonia and nitrite: 0 ppm
• Nitrate: under 40 ppm

Cycle the tank before you add the fish. A fishless cycle often takes about a month. After that, do a weekly water change of about 25%.

What Size Aquarium Do They Need?

A single betta needs at least 5 gallons. Ten gallons is better, because the water stays stable and you have more room for plants and decorations. A betta in a community tank should have at least 10 gallons, and 15 to 20 gallons gives you more room for error.

Which Fish Can Live With a Paradise Betta?

Some experts say bettas are best kept alone, so treat tank mates as an experiment, not a guarantee. If you try a community tank, use at least 10 gallons, add plenty of plants and hiding places, and watch the fish closely for the first few weeks. Have a backup tank ready to separate them.

Look for small, peaceful fish that keep to themselves and don’t nip. Avoid brightly colored fish and anything with long, trailing fins, because a male betta may see them as rivals. Avoid fin nippers like tiger barbs.

Tank mates that usually work in a planted tank of 10 gallons or more:

• Ghost shrimp – larger ones; the betta may eat small ones
• Rasboras, such as harlequin or chili rasboras
• Tetras – small, calm species in a group
• Corydoras catfish
• Snails

Tank mates to avoid:

• Gouramis and other labyrinth fish, which compete for the same territory and surface space
• Mollies and other active, fin-nipping or larger fish
• Other male bettas

See our guide to betta tank mates for more options.

Can You Keep Paradise Bettas Together?

Never keep two males together. The fights lead to injury and death.

Female bettas can sometimes live together in a “sorority,” but only in a large, heavily planted tank. Keepers recommend at least 4 to 6 females in 20 gallons or more, because two or three females tend to bully the weakest one. Even then, you must watch for fighting. A male and female together usually end badly, so keep them apart except for breeding. See our guide to female bettas for details.

What Do Paradise Bettas Eat?

Bettas are carnivores. In the wild, they eat small insects, insect larvae, and zooplankton. In your tank, a good betta pellet should be the staple, with frozen or live foods as regular treats. Good options include bloodworms, brine shrimp, and daphnia.

Feed once or twice a day, and give only what the fish finish in about a minute. Bettas will overeat if you let them, and overfeeding is a common cause of constipation and bloating. If your betta looks bloated, stops eating, or turns lethargic, skip a day of feeding.

How Do You Keep a Paradise Betta Healthy?

Betta fins are delicate, so cuts and tears from rough decor or tank mates are common. Check the fish often and treat injuries early before they become infected.

Fin rot is the most common problem. It shows up as frayed, shrinking, or discolored fins. Poor water quality is the usual cause, which is another reason to use a filter and keep up with water changes. Improve the water first, then treat as needed.

Bettas can also get the viral infection lymphocystis, which causes small white dots that grow into cauliflower-like lumps. They are also susceptible to ich (white spots).

Watch for these signs that your betta is not well:

• Clamped fins or fins that are fraying
• Loss of color or appetite
• Lethargy or resting on the bottom for long periods
• Rapid breathing or gasping at the surface all the time
• White spots, patches, or lumps on the body or fins
• Swollen belly

With good care, bettas commonly live around 3 to 5 years.

What Are the Most Common Betta Mistakes?

• Keeping a betta in a bowl or vase. There is no filter or heater, and the water fouls quickly. A heated, filtered tank of 5 gallons or more is the minimum.
• Skipping the heater. A betta kept at room temperature (often 67-69°F) tends to be sluggish and more prone to illness.
• Using a strong filter. Long-finned bettas get pushed around and tire out. Choose a sponge filter or adjustable flow.
• Overfeeding. A pinch of food once or twice a day is plenty. Excess food fouls the water and causes constipation.
• Adding fish before the tank is cycled. Ammonia and nitrite burn fins and gills.
• Housing two males together, or adding fin-nippers and brightly colored, long-finned fish as tank mates.

How Do You Breed Paradise Bettas?

Breeding betta fish is not easy at home, and it is best left to experienced keepers. You need a separate breeding tank and a plan for housing the fry, and the preparation takes time.

Courtship comes first. The male builds a betta bubble nest at the surface. If courtship goes well, he wraps around the female and fertilizes the eggs as she releases them.

Remove the female after spawning so she doesn’t eat the eggs or get attacked. The male moves the eggs to the nest. The eggs hatch in about 24 to 48 hours. The fry then stay in the nest, and the male catches any that fall and repairs the nest. They are free-swimming after about 3 to 4 days, and you should remove the male at that point.

Are Paradise Bettas Suitable for Your Aquarium?

Paradise bettas are attractive fish with a lot of personality. They suit beginners who are willing to set up a heated, filtered, properly sized tank and who understand that a betta is not a bowl fish.

Give them a tank of at least 5 gallons (10 is better), keep the water warm and clean, and avoid housing males together. If you want a community tank, choose the tank mates carefully and be ready to separate them.