Species, Cyprinids, Freshwater fish, Rasboras

Brilliant Rasbora: Complete Species & Care Overview

Photo of author

by Jason Matthews



The Brilliant Rasbora is a popular species of fish that has captured the interest of both fish enthusiasts and pet owners. This species is not only a beautiful addition to any aquarium due to its vibrant and brilliant color but also an intelligent and active species that will provide hours of entertainment for the observer.

Because it is hardy, easy to care for, and can thrive in various tank conditions, the Brilliant Rasbora is an excellent choice for beginning and intermediate fish owners.

In this article, we will go over the Brilliant Rasbora’s origin, appearance, size, gender, behavior, tank conditions, tank mates, diet, breeding, and diseases in great detail, giving you all the information you need to make an informed decision about adding this species to your aquarium.


Scientific Name: Rasbora einthovenii
Common Names: Brilliant rasbora
Life Expectancy: 4-6 years
Adult Size: 3.5 inches (9 cm)


HabitatSlow-moving rivers, streams, and forest swamps with heavily vegetated areas
OriginSoutheast Asia
Care LevelEasy
TemperamentPeaceful, schooling
Tank LevelMid to upper levels
Minimum Tank Size20 gallons (75 liters)
Water pH6.0-7.5
Water Temperature75-82°F (24-28°C)
Water HardnessSoft to medium
LightingLow to moderate
Tank MatesSmall, peaceful fish

Fun Fact Corner

A fun fact about Brilliant Rasboras is that they are known for their schooling behavior. In the wild, these fish frequently swim in large groups, protecting them from predators and allowing for more efficient food foraging. Keeping at least six Brilliant Rasboras together in the aquarium is recommended to recreate this social dynamic and bring out their natural schooling behavior. Seeing a school of Brilliant Rasboras swim in unison can be a mesmerizing and beautiful sight, making them not just fascinating pets but also a delightful addition to any aquarium setup.


The Brilliant Rasbora (Rasbora Einthovenii) is a Southeast Asian native of Thailand, Malaysia, and Indonesia. The species can be found in slow-moving streams, rivers, and swamps, where it prefers to live in dense vegetation. 

The Brilliant Rasbora is a tough species well-adapted to life in its natural environment, marked by changing water levels and temperatures.

Appearance & Size

The Brilliant Rasbora’s vibrant and eye-catching appearance distinguishes it from other fish species. The species is known for its brilliant metallic sheen, which changes color depending on the lighting and angle of observation, from silver to gold to green.

This sheen is complemented by a distinct pattern of black dots on the body and fins, which adds to the species’ beauty. The Brilliant Rasbora also has a different, semicircular black marking on the base of its caudal fin, which adds to its overall appeal. 

The Brilliant Rasbora is a small species, reaching a maximum length of 3.5 inches. This makes the species ideal for life in small to medium-sized aquariums with plenty of space for swimming and exploring. 


The Brilliant Rasbora is a species in which the genders are challenging to distinguish based on appearance alone.

Male and female Brilliant Rasboras are similar in size and coloration, making it difficult to tell them apart without a closer look.

Males may have slightly longer fins in some cases, but this is not a consistent or reliable indicator of gender. 

It is best to observe your Brilliant Rasbora’s behavior to determine gender. Males may be more aggressive or territorial towards other males in the tank.

Understanding the gender of your Brilliant Rasboras can help you breed them, as the species is known to breed easily in captivity. It is important to accurately determine the gender of your Brilliant Rasboras, whether you intend to produce them or want to maintain a healthy and harmonious community.


The Brilliant Rasbora is known for its vibrant and lively personality, making it a popular choice for community tanks. Because the species is a schooling fish, keeping at least six individuals together is best to encourage natural behavior. 

Brilliant Rasboras form close-knit schools in the wild for protection and socialization, and this behavior is mimicked in captivity. Brilliant Rasboras will swim energetically throughout the water column in a well-maintained tank, displaying their brilliant metallic sheen and playful personalities.


The Brilliant Rasbora is a calm species that is ideal for community tanks. The species thrive when kept with other peaceful, non-aggressive species with similar water needs. When selecting tankmates for your Brilliant Rasbora, keep in mind the size of the other species, as well as their behavior and dietary requirements.

Some good tankmates for the Brilliant Rasbora include:

Certain species, such as cichlids, may be too aggressive for the Brilliant Rasbora and should be avoided. It is also best to avoid keeping large, predatory species with Brilliant Rasbora because they may see the smaller fish as a potential food source.

Tank conditions

Brilliant Rasbora is a tough species that can adapt to various tank conditions. The species is native to slow-moving streams and rivers in Southeast Asia; it prefers a well-oxygenated, slightly acidic environment. A strong filtration system and frequent water changes are required to replicate these conditions in the aquarium.

The Brilliant Rasbora is also a warm-water species, so keep the tank temperature between 78 and 82°F. Furthermore, the species is a low-light fish that does not require intense lighting to thrive. It is essential to provide plenty of hiding places in the tank, such as live plants, driftwood, and caves, to promote the health and well-being of the Brilliant Rasbora.


The Brilliant Rasbora is an omnivorous species that will accept a variety of foods in the aquarium. The species feeds on various small insects, crustaceans, and plant matter in their natural habitat. Various foods, including flakes, pellets, frozen, and live foods, should be provided to replicate a balanced and varied diet in the aquarium. 

Some good dietary options for the Brilliant Rasbora include:

  • Flake food
  • Pellets
  • Freeze-dried foods (such as bloodworms, brine shrimp, and daphnia)
  • Live foods (such as brine shrimp, blackworms, and daphnia)
  • Vegetable-based food (such as spinach, lettuce, and peas)

It is important to avoid overfeeding the Brilliant Rasbora, as this can lead to water quality issues and health problems. To maintain optimal health and vitality, providing a balanced diet that includes both protein- and vegetable-based foods is critical. 


Breeding the Brilliant Rasbora can be a rewarding experience for those with some experience in breeding fish. Proper conditions must be provided to produce Brilliant Rasbora, including a healthy diet, good water quality, and appropriate water temperature and pH levels. 

Furthermore, a suitable breeding environment, such as a breeding tank or a breeding cone, is required to ensure the eggs are protected and the fry can develop and grow properly. It is recommended to keep a ratio of two females to one male and to raise the water temperature to encourage breeding slightly. The male Brilliant Rasbora will fertilize the eggs laid by the female Brilliant Rasbora in a suitable location, such as among plants or in a breeding cone. The eggs will hatch in 24-48 hours, and the fry will swim freely in 3-5 days.

It is important to provide a suitable diet and conditions for the fry’s growth and development once they have hatched. Small live or frozen foods, such as brine shrimp or daphnia, as well as a suitable water temperature and pH level, may be included. The Brilliant Rasbora can be successfully bred with proper care and attention. Knowledge and understanding of breeding fish are necessary to ensure the best outcome for the fish and the fry.


Diseases are a common concern for Brilliant Rasbora owners. Maintaining good water quality and a balanced diet are essential for keeping your fish healthy. Fin rot, Ich, and bacterial infections are Brilliant Rasboras’ most common diseases. 

Monitoring your fish for signs of disease, such as changes in behavior, appetite, or appearance, is important. If you suspect your fish is ill, it is best to consult an aquarium fish veterinarian as soon as possible to ensure prompt and effective treatment. Maintaining a healthy tank environment and regularly monitoring your fish can help prevent the disease from spreading and ensure your Brilliant Rasbora lives long and happy.


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

🐠 Get Your Free Ebook: A Beginner's Guide to Aquariums - Sign Up Now!

Learn everything you need to know to keep fish, including setting up your tank, choosing the right fish, and maintaining water quality. As a subscriber, you'll also stay up-to-date on the latest aquarium products, special offers, and discounts.

Your privacy is important to us. You can trust that we will never share or sell your information, and we'll only send you relevant content.

Leave a Comment