Clown Rasbora (Rasbora kalochroma): Ultimate Care Guide

Clown Rasbora
Clown Rasbora. Factumquintus at German Wikipedia, CC BY-SA 3.0

Clown Rasbora Facts

The Clown Rasbora, also known as the Harlequin Rasbora, is a tiny freshwater fish.  It is indigenous to Southeast Asia, more specifically in Thailand, Malaysia, and Sumatra.  These fish belong to the family Cyprinidae, which also includes well-known aquarium species like tetras and barbs.  Clown Rasbora have long been a favorite among aquarium hobbyists because of their vivid colors, calm demeanor, and toughness.  Although they are tiny, growing to a maximum length of 1.5 cm, they are easily identified by their stunning appearance, which features red and orange bodies with black dots and stripes throughout.

Clown Rasbora are usually found in slow-moving streams, swamps, and peat forests in the wild, where they form schools and hunt for microscopic prey like insects.  They thrive when housed in groups of six or more because they are typically calm animals.  They are a fantastic choice for beginning aquarists because they are also fairly hardy, tolerating a wide range of water conditions and temperatures.

Clown Rasbora thrive in aquariums that closely resemble their native habitat, with lots of plants and an acidic, softer substrate.  They require little care and will eat a range of live and frozen foods with no problem.  Additionally, because they are highly active and energetic fish, they offer a lot of movement and vitality to any tank. They flourish in aquariums that are lushly planted and have lots of hiding places.  Anyone wishing to add some vibrant and active fish to their home aquarium should strongly consider the Clown Rasbora.  These fish will astonish hobbyists of all levels with their striking look, calm demeanor, and simplicity of maintenance.  By following this guide, you will be able to create the perfect environment for your Clown Rasbora.

Clown Rasbora Care

Due to their vivid coloring and animated movement, Clown Rasbora are a very popular species of fish among aquarium aficionados.  Their hardiness and ability to adapt to a variety of water conditions, these fish are thought to be quite simple to maintain.  For the health and longevity of the Clown Rasbora, a well-kept aquarium with appropriate filtration, water temperature, and pH levels is crucial.  They are perfect for community tanks since they are social and quiet.  Any fish that you keep will require a great deal of care, regardless of how easy they are to keep.  As long as you maintain the appropriate conditions, the Clown Rasbora should live and long and fulfilling life.


Originally from Southeast Asia, Clown Rasbora fish require water that is between 72 and 82 °F.

Since abrupt temperature changes can stress the fish and lead to illness, it is crucial to maintain a consistent temperature range within this range.  Utilizing a high-quality aquarium heater and thermometer is advised in order to maintain a constant temperature.  Depending on their age, health, and tank circumstances, Clown Rasboras’ preferred temperature might change.  Along with the tank’s temperature, it is crucial to take into account the needs of any additional fish species that might be kept there.

Water pH

Aquarium pH should be between 6.0 and 7.0 for Clown Rasbora fish.  To preserve the health and wellbeing of the fish, it is essential to keep the pH level fixed and within this range.  Keep in mind that the type of substrate, the decorations, and the hardness of the water can all affect pH levels.  The pH level can be kept within the appropriate range with the addition of aquarium-grade pH buffer solutions and routine water changes.  Equally crucial for preserving stability is routine pH level monitoring and correction.  To make sure the pH level stays within the ideal range for Clown Rasbora fish, it is advised to monitor the level at least once each week.

Clown Rasbora Size

The small sized Clown Rasbora fish can only grow to a maximum length of 1.5 to 2 inches (3.8-5 cm).  They are a tiny-sized fish that are perfect for smaller aquariums.  However, they do prefer to have a bit of space in their tank as most fish require a bit of room to swim around.  The water conditions will be more stable in larger aquariums, which will also support a larger fish community.  Despite the Clown Rasbora size, they are quite social and like to investigate the tank.

Food & Diet

Because they are omnivores, Clown Rasbora fish need a variety of foods to stay healthy.  These fish should consume both plant and animal stuff in their diet.  Fish can be given live and frozen foods, such as brine shrimp, daphnia, and bloodworms, several times per week. These foods are a rich source of protein.  Dry meals like flakes and pellets can also be given and need to be a foundation of their diet.  For the fish to munch on, the aquarium must also have live or artificial flora in addition to prepared feeds.  This will imitate their native environment and serve as a source of food and stimulation. 

It is also important to note that overfeeding your Clown Rasbora will lead to health problems and the water getting dirtier more quickly.  It is best to feed them smaller, frequent meals throughout the day.  Clown Rasbora only need as much as they can eat in a few minutes.  Considering their size, you do not want to give them too much food.


The average lifespan of the Clown Rasbora is between 3 to 5 years when kept in a well-maintained aquarium with proper water conditions and a balanced diet.  However, the lifespan will be affected by how well you maintain the conditions of the tank.  Ideally, the healthier the environment, the longer the Clown Rasbora will live.

Tank Size

There are several factors to take into account when determining the right tank size for the Clown Rasbora fish.  A common standard is to provide at least 10 gallons of water for every one or two fish.  But if you want to keep a larger group of Clown Rasbora, you should strive for a tank that is 20 gallons or more.  Additionally, they favor an aquarium with lush plants and lots of hiding spots.  Larger tanks will provide the Clown Rasbora fish the space they need to swim freely and feel less stressed.  Clown Rasbora are busy fish that demand a lot of swimming room, plus you may decide to get some tank mates for your Clown Rasbora, so it is important to keep these things in mind when choosing the tank size. 

Tank Setup

For Clown Rasbora fish to be healthy and happy, the tank must be properly set up.  When putting up a tank for these colorful and active fish, follow these simple guidelines.  Firstly, think about the water’s quality.  Despite being tough fish, Clown Rasbora need clean water that has been well filtered in order to survive.  Maintaining water purity and eliminating any hazardous substances or waste requires a high-quality filter.  To keep the water clean and fresh, you should also replace the water frequently.

Another crucial component of a Clown Rasbora tank design is planting.  These fish love an aquarium with dense vegetation and lots of places to hide.  Alternatively, artificial plants can also be utilized, but live plants are best.  Your Clown Rasbora fish will feel more secure and less anxious if you add some hideaways.  Consideration should also be given to lighting.  Low to medium lighting is advised for Clown Rasbora because bright lighting is not desirable.  This will encourage the growth of any living plants and produce an environment for your fish that looks more like the Clown Rasbora’s natural habitat.  Whatever you decide for your tank setup will have a large effect on the fish’s lifestyle.


Hobbyists who enjoy keeping aquariums may find breeding Clown Rasbora fish to be a fun and gratifying activity.  These little, energetic fish lay eggs and are renowned for their vivid colors and tranquil personalities.  In order to successfully breed Clown Rasbora, an aquarium must include a stable population of healthy fish.  Your fish will benefit from a large tank with lots of hiding spots and a decent filtration system, which will improve their health and enhance the likelihood of fertile offspring. 

Male Clown Rasbora differ from females in size and sex by being generally smaller and slimmer.

Additionally, they have longer fins and more saturated colors.  Female Clown Rasbora, in comparison, are typically bigger and rounder, especially when they are carrying eggs.  Keep a ratio of one male to two or three females while breeding Clown Rasbora, according to experts.  The likelihood of successful reproduction will also rise as a result of preventing the males from bothering the females overly.

Clown Rasbora are renowned for their peaceful nature, and they will typically reproduce without any violence or territorial issues.  In the tank’s greenery or among its hiding places, the females will lay their eggs, which the males will fertilize.  For aquarium hobbyists, producing Clown Rasbora fish can be a simple process that is both entertaining and rewarding.  A healthy, stable population of fish in a well-kept aquarium with a solid filtration system, lots of hiding spots, and a ratio of one male to two or three females are necessary to maximize your chances of success.  You can enjoy seeing these colorful and lively fish reproduce if you adhere to these guidelines.


Clown Rasbora do not seem to be particularly prone to the typical freshwater illnesses that affect other fish.  That doesn’t prevent them from ever becoming ill, though.  If the water in their tank is of low quality, any fish could become ill.

Ich is the most typical sickness that these fish contract.  This parasite will cling to your fish and start to destroy them over time.  The presence of white patches on your fish’s body is the most blatant indication of Ich.  It is possible to treat Ich by raising the water’s temperature by two degrees and taking anti-parasitic drugs.

Fin and tail rot is a common, curable bacterial disease brought on by untreated water.

The tissues in the fish’s fins and tail deteriorate from the edge to the base as a result of this illness.

Lethargy, discoloration of the fin or tail, and wear and tear on a portion of the fin or tail are all symptoms of fin and tail rot.  This illness can be treated with frequent water changes, thorough cleaning of the debris, aquarium salt added to the water, and antibiotics like Amoxicillin.

These diseases and others like dropsy and pop-eye can really be avoided by just maintaining a healthy environment and diet for your Clown Rasbora.

Tank Mates

Clown Rasbora fish are a small, calm species that can be housed in a community tank with many other fish species.  Betta, Guppies, Neon Tetra, Cardinal Tetra, and Danios are friendly species with comparable sizes and temperaments that make excellent tank mates.  Amano Shrimp and Cherry Shrimp make excellent tank mates for the Clown Rasbora because they are not aggressive and maintain the aquarium clean.

Larger species like goramis, platys, and barbs would not make good tank mates for Clown Rasbora because they can be highly aggressive and frighten the smaller fish.  Even though they are attractive, angelfish are not recommended because they have a tendency to bully the other fish in the tank.  Clown Rasbora make an unusual tank companion for African Dwarf Frogs, but it’s important to keep in mind that these frogs have certain water temperature and pH range requirements that might be challenging to meet for both the frogs and the fish.

Where can I find Clown Rasbora for sale?

The majority of pet shops that focus on aquarium fish sell Clown Rasbora fish.  Petco and PetSmart are two well-known national chains that sell Clown Rasbora.  They may be ordered online from trustworthy aquarium fish vendors like LiveAquaria and AquaBid.  Depending on the region, quantity, and size of the fish, Clown Rasboras’ standard cost can change.  Clown Rasboras are typically regarded as an inexpensive species and can be bought for between $2 and $5 each.  Even though some specialty shops might charge more, with a little searching, it’s feasible to locate Clown Rasbora at a fair price.  To make sure that the Clown Rasbora you buy are healthy and well-cared for, make sure you buy them from a trustworthy retailer.  Before making a purchase, it’s a good idea to do some research on the seller or pet store to make sure they are reputable and take good care of their fish.

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