Species, Cyprinids, Freshwater fish, Rasboras

Clown Rasbora: Complete Species & Care Overview

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by Jason Matthews



The Clown Rasbora is a fascinating and colorful fish species popular among pet fish enthusiasts. This article will investigate the Clown Rasbora’s origin, appearance, size, gender differences, behavior, tank conditions, ideal tankmates, diet, breeding habits, and common diseases. 

Whether you’re a novice or an experienced fish keeper, you’ll gain a thorough understanding of this vibrant and hardy species, making you a more knowledgeable and confident fish keeper.


Scientific Name: Rasbora kalochroma
Common Names: Clown rasbora
Life Expectancy: Up to 5 years
Adult Size: 2-2.5 inches (5-6 cm)


HabitatSlow-moving, clear or blackwater streams and ponds with dense vegetation
OriginThailand, Malaysia, Singapore, and Sumatra
Care LevelEasy
TemperamentPeaceful, schooling
Tank LevelMiddle to top
Minimum Tank Size20 gallons
Water pH6.0-7.0
Water Temperature72-80°F (22-27°C)
Water Hardness2-10 dGH
LightingLow to moderate
Tank MatesPeaceful community fish

Fun Fact Corner

A fun fact about Clown Rasboras is that they have a unique way of communicating with one another. They can produce audible sounds to humans, which they use to signal danger or to establish dominance within their group. This ability makes them an exciting species to observe in a well-kept aquarium.


The Clown Rasbora, also known as Rasbora kalochroma, is a small freshwater fish native to Southeast Asia. It is a member of the Cyprinidae family. The Clown Rasbora lives in clear, slow-moving waters, feeding on small crustaceans, insects, and algae. 

Appearance & Size

The Clown Rasbora’s bright and eye-catching appearance distinguishes it from other fish species. It has an elongated and slender body with a shimmering metallic sheen. 

The Clown Rasbora’s most striking feature is its coloration, ranging from a deep red to a brilliant orange and even a gold hue. The fish’s fins are also decorated with black markings, giving it a distinct appearance.

The Clown Rasbora is a small fish that can reach a maximum length of 3.9 inches. This makes it an excellent choice for small aquariums and those who prefer smaller fish species. Despite its small size, the Clown Rasbora has a tough and hardy body well-suited to captivity. 

The Clown Rasbora’s small size makes it easy to care for, as it requires less space and resources than larger fish species.


The Clown Rasbora species has distinct physical differences between males and females, making the two genders relatively easy to distinguish. Males are slimmer and more colorful than females, with more intense red, orange, or gold coloring. Females, on the other hand, are typically rounder and plumper, particularly when carrying eggs. 

Furthermore, males have longer and more pointed dorsal fins than females, with shorter and rounder dorsal fins. These physical distinctions between males and females can benefit breeders attempting to breed this species in captivity successfully. 

Understanding the Clown Rasbora’s gender differences can also help fish owners make informed decisions about the best tankmates for this species, as some fish exhibit different behaviors toward different genders.


The Clown Rasbora is known for its peaceful and sociable behavior. This species is active and constantly swimming, adding movement and life to the aquarium. 

It is also a shoaling fish, which means it prefers to live in groups and does best when kept in groups of 6 or more individuals. Shoaling behavior provides safety in numbers and helps to reduce stress levels in the fish in the wild. 

Clown Rasbora is a hardy species not known for aggressive behavior toward other fish species when kept in a suitable environment.

community tank.


When selecting tankmates for the Clown Rasbora, choosing species compatible in size, temperament, and water requirements is important. Because the Clown Rasbora is generally peaceful and non-aggressive, it is best paired with other temperate species that will not stress or harm it.

Some good tankmates for the Clown Rasbora include:

  • Other peaceful and non-aggressive fish species such as Neon Tetras, Harlequin Rasboras, and other species of Rasbora
  • Slow-moving bottom-dwelling fish species such as Corydoras catfish and Otocinclus catfish
  • Calm and non-aggressive invertebrates such as cherry shrimp and snails

It is important to note that some fish species may show aggression towards the Clown Rasbora, such as larger and more aggressive species or fish with similar color patterns and body shapes.

Tank conditions

The Clown Rasbora is a relatively hardy species that does well in captivity if the tank conditions are appropriate. This species should be kept in an aquarium at least 20 gallons in size, with water temperatures ranging from 72°F to 80°F and a pH range of 5.0 to 7.0. 

The Clown Rasbora also prefers a well-planted aquarium because it provides hiding places and reduces stress. It is important to maintain the aquarium properly, with regular water changes and filtration, to keep the water clean and healthy for the fish. 

Furthermore, it is essential to avoid overcrowding the tank, which can increase stress and lead to health problems.


The Clown Rasbora is an omnivorous species that requires a well-balanced diet to stay healthy. It feeds on small insects, crustaceans, and plant matter in the wild. A varied diet that includes plant- and animal-based foods are recommended in captivity. 

A good diet for the Clown Rasbora may include the following:

  • High-quality dry or frozen foods, such as flake or pellet food, designed specifically for omnivorous fish species
  • Live or frozen foods such as brine shrimp, daphnia, and bloodworms can occasionally be given as treats.
  • Foods made from vegetables, such as blanched lettuce or spinach, that provide additional nutrients and fiber

It is important to avoid overfeeding the Clown Rasbora, as this can lead to health issues such as obesity and increased waste levels in the tank.


Breeding the Clown Rasbora can be a rewarding experience for fish owners with the proper setup and conditions. While these fish are relatively simple to produce, it is critical to understand their needs and behaviors to have the best chance of success.

The following are some of the most important factors for successful Clown Rasbora breeding:

  • Water conditions: To promote good health and breeding behavior, it is critical to maintaining stable and appropriate water conditions, including pH, temperature, and hardness.
  • Tank setup: A separate breeding tank with appropriate plants and hiding places can encourage breeding behavior while providing a suitable environment for the eggs and fry.
  • Lighting: A consistent lighting schedule can help stimulate Clown Rasbora breeding behavior.
  • Diet: A varied and nutritious diet can help improve the fish’s overall health, increasing the chances of successful breeding.

By providing the proper conditions and care, fish owners can help increase the chances of breeding the Clown Rasbora in captivity. This can be a rewarding and educational experience, providing a unique opportunity to observe and understand this fascinating species’ breeding behavior and development.

Fish owners can help increase the chances of breeding the Clown Rasbora in captivity by providing the proper conditions and care. This can be a rewarding and educational experience, allowing you to observe and comprehend this fascinating species’ breeding behavior and development.


The disease is a common concern for all fish owners, and the Clown Rasbora is no exception. Taking proactive steps to maintain good water conditions, nutrition, and hygiene can help reduce the risk of disease and improve the overall health of the fish.

If you suspect your Clown Rasbora is suffering from any disease, it is important to seek veterinary advice as soon as possible. Early intervention and treatment can significantly improve the chances of a successful outcome and help prevent the spread of disease to other fish in the tank.


Jason Matthews

My name is Jason Matthews, and welcome to my website. When other kids were bragging about how their dog could sit and roll over, I was bragging about my latest Betta Fish and the cool sea castle I just added to his aquarium. 

Jason aquariume

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