Harlequin Rasbora and Betta: Peaceful Tank Friends?

In this article, we will understand the relationship between Harlequin Rasboras and Betta fish. We will explain if they can be set up together in the same vase.

Harlequin Rasbora and Betta: Peaceful Tank Friends?

Yes, Harlequin Rasboras make excellent tank mates for bettas. A common misconception is that male bettas must spend solitary lives because they are so violent. That isn’t always the case, however. Bettas are inquisitive and clever fish that might become bored if they are kept in an uninteresting or unstimulating environment. The Harlequin rasbora and the betta fish are an excellent match, in this article, we will describe why.

Bettas and Harlequin Rasbora requirements

Among the many varieties of Rasbora, the Harlequin Rasbora is one of the most popular.

As long as you take care of your Rasbora, they may grow up to 2 inches long and survive for six years. Similar to bettas, they thrive in a variety of water types. At a pH range of 6-7.5 (bettas prefer 7.0), they may survive in water temperatures of 73-82°F (bettas prefer 78°F).

Make sure your Harlequin Rasboras are getting a varied diet of meat and vegetables.

The fact that they are omnivores suggests that they aren’t likely to be picky eaters.

All types of food may be utilized, including flakes, dried, frozen, and fresh.

As a shoaling fish, the Harlequin Rasboras should be kept in small groups, no more than eight fish at a time. As a result of their size and necessity for a big group, you’ll need at least a 20-gallon tank. Whether or if Bettas and Harlequin Rasboras will get along is an open question.

Concerns about the aggression of their betta in a communal tank are prevalent. If you have a betta and a pair of harlequin Rasboras, the odds of their being attacked are quite low. Rasboras can swim faster than bettas, who are sluggish. In the unlikely event your betta should attempt to attack your Rasboras, he would have little chance of capturing them.

It is possible, even though it is rare, that one of your betta’s Harlequin Rasboras may attempt to nibble its fins. For the sake of your Betta’s well-being, you should separate the Rasbora if you detect this behavior.

Betta fish

Bettas, often known as Siamese fighting fish, are stunning members of the Gourami family.

Bettas come in a broad range of colors and patterns, from red to white, with a diversity of fin kinds and patterns. 3 to 4 inches in length, the betta fish’s fins maybe twice the length of its body.

The betta may live for up to four years and is known for its territorial and aggressive behavior.

Male bettas should be housed in a 5-gallon tank, while female bettas should be housed in a 10-gallon tank. Keep in mind that the tank capacity has to be expanded to accommodate the additional fish you want to keep with your bettas.

Rasbora Harlequin

This popular tropical fish should be maintained in shoals of at least six other fish to maintain its vibrant colors and vibrant patterns. With two males and four females, there will be no mate-seeking. Rasboras may be maintained alongside bettas because of their comparable water quality needs, which makes them perfect for the company of one another. A small shoal of rasboras may be kept in a tank no larger than 10 gallons. Fish in the same tank should not be alarmed by their presence, since they aren’t very aggressive. These fish have a lifespan of between two and five years and develop to a maximum length of 1.5 to 2 inches.

Can Harlequin Rasboras and Betta fish share an environment?

For each fish species, compatibility is based on each individual’s preferences for water conditions. This is not an issue with betta fish and rasboras since they both live in the same natural environment. As a result, both fish species will be able to thrive in the same water conditions, such as pH and temperature. In addition, they may also consume the same sorts of meals as they do.

Because of this, you’ll find roosters like the betta and betta in the rice fields and other slow-moving waterways in South East Asia. Your pet’s betta companions will be pleased as long as you keep the tank steady and offer the betta with the water conditions it prefers.

fish should be housed in an environment that is optimal for them both. Even if they are kept together, there is no assurance that they will not engage in hostile behavior. Harlequin rasboras are more likely to get along with bettas who have previously lived with other fish.

Be on the lookout for signs that one of them is bullying the other. Keeping an eye out for any nibbling on your Betta’s long fins is another vital step to take while keeping rasboras.

Rasboras may be housed in sororities with female bettas, but only one male betta should be kept with the whole shoal.

Nutrition and diet

A little amount of plant and vegetable matter may be eaten by betta fish, although they are mostly carnivorous.

Harlequin rasboras are omnivores, and they can eat everything. Their diet consists of microscopic insects, small crustaceans, and worms in the wild. It is recommended that these fish be fed a variety of tropical flakes and pellet food, with the addition of bloodworms or brine shrimp on rare occasions. Some blanched spinach or lettuce are also suitable as a food option for your guests.

Your fish should be fed twice a day, with a little amount of food that will last just a few minutes. Roughly speaking, Bettas like to consume food on the top, whereas rasboras prefer to scavenge for food that floats to the bottom of the tank. Because of this, there should be no conflict over food in a communal tank.

The capacity of a tank.

It is best to keep Harlequin rasboras in schools of up to ten rather than keeping them individually. As a result, the Harlequin rasbora will not thrive in a tiny tank where you keep your betta. A shoal of 10 rasboras needs a tank with a minimum capacity of 20 gallons.

To ensure that your betta doesn’t feel frightened by his tankmates, you should give him a little more room than that. A 30-gallon aquarium is an ideal size for a school of Harlequin rasboras and a betta to live happily together.

Both species prefer a long tank over a tall one when it comes to tank form. Bettas require easy access to the water’s surface for feeding and breathing. Rasboras enjoy swimming together in a school, and a large tank is ideal for that.

Temperature and clarity of the water

Rasboras and bettas are native to still, slow-moving bodies of water. It is important to have a good filtration system in your aquarium, however, a high flow rate is not recommended since it would stress the fish.

Both bettas and rasboras like water temperatures between 73.0° and 82.0° Fahrenheit, so they may coexist peacefully. Make sure to keep the pH level in the range of 5.5 to 8 and the water hardness between 1 and 15 dGH.

In-tank ornamentation

If you want to show off your betta and Harlequin rasboras’ vibrant colors, you’ll need a darker substrate.

If you don’t want your rasboras to become spooked, you’ll need to provide them with plenty of hiding spots. Fish like darkly lit environments and floating plants are a wonderful choice, as they will help to disperse any light that enters their tank, while also anchoring their bubble nests and protecting any newly-hatched fish. In addition, your betta would welcome a few plants with large leaves for resting.

Keep at least one resin cave or hanging log in your setup for your bettas to hide in and claim as their own. You may decorate your aquarium with driftwood and pebbles, but be cautious not to overcrowd the tank so that the rasboras have to compete with other fish for their precious swimming area. Plants and fish both benefit from the tannins produced by bogwood, which serves as an excellent anchor for certain types of plants.

Some dried leaves in the tank may encourage microbe colonies to develop, which will give more food for rasboras to munch on.

Betta fish and Harlequin Rasbora behavior

Bettas like to spend most of their time at the top of the water column, sometimes gulping air from the surface. Harlequin rasboras enjoy the open water of the top to middle sections of the tank, so they won’t be in direct competition with your betta there.

There’s no doubt that male bettas have a reputation for being aggressive and refusing to share their territory with other fishes. There are many different types of bettas out there, and some are more laid back than others. If you’re looking for calm and quiet in your aquarium, Rasboras are the fish for you! This means that if you have enough hiding spots, both species should be able to avoid each other.

Betta fish and Harlequin Rasbora Diseases

Both species are relatively disease-resistant if provided the proper water conditions and a healthy, well-balanced diet. It’s important to remember that a variety of common illnesses may be brought on by overfeeding, filthy tank conditions, and the introduction of new fish.

A fortnight’s quarantine is essential before introducing fresh fish to your primary tank.

It’s also a good idea to thoroughly wash any new plants, ornaments, or substrate before adding them to your display aquarium.

Make sure your filtration system is regulating ammonia and nitrate levels appropriately to avoid health issues by keeping the tank clean and well-maintained.


In this post, we understood the relationship between Harlequin Rasboras and Betta fish. We explained if they can be set up together in the same vase.

If you have any thoughts or doubts, feel free to drop us a comment below!

Frequently Asked Questions (FAQs): Harlequin Rasbora and Betta: Peaceful Tank Friends?

Are harlequin rasboras compatible with bettas?

Harlequin Rasboras are fantastic betta tank companions. They both exist in similar settings, and their gentle natures and rapid speed make it unlikely that antagonism between the two species would develop.

How many harlequin rasboras can you keep with a betta?

Minimum tank size: 10 gallons for 1 male betta and 6 harlequin rasboras. A sorority of female bettas and a shoal of six harlequin rasboras should be housed in a 20-gallon minimum tank.

If you want to add more fish, the capacity of the aquarium should be raised by 5 gallons.

How many rasboras can be housed in a ten-gallon tank beside a betta?

The basic line is that Rasboras should be housed in schools of five with a minimum tank size of twenty gallons. Two Rasboras may be housed in a 10-gallon tank at the very least, however, this is not advised.

Can dwarf rasboras live peacefully with bettas?

Dwarf Rasboras are not an ideal companion for Bettas. Even in groups of ten or twelve, they are easily scared by the Betta, and combining them would create ongoing stress for your Dwarf Rasboras.

What Aquarium Size Does Harlequin Rasbora Require?

Harlequin rasboras need a minimum of a ten-gallon tank. Any smaller and there would be insufficient area to shoal, forcing them to be kept in couples or on their own.