Species NameRasbora spp.
Common NameRasbora
Care LevelEasy
Lifespan5-7 years
Adult Size1.5-6 inches (varies by species)
Minimum Tank Size10 gallons
Temperature74°F – 82°F (23°C – 28°C)
Water ConditionspH 6.0-7.5, soft to medium hardness

About the Rasbora – Species Summary

Rasboras are a group of small, vibrantly colored freshwater fish that belong to the family Cyprinidae. Originating from the freshwater rivers, lakes, and streams of Southeast Asia, these fish have become popular in the aquarium hobby due to their brilliant colors, schooling nature, and relatively straightforward care. Their active swimming patterns, coupled with their peaceful temperament, make them ideal candidates for both novice and experienced aquarists.

Rasbora Lifespan

Under optimal care and in the right conditions, Rasboras have an average lifespan of 5 to 7 years. Like all fish, the longevity of Rasboras is heavily influenced by factors such as diet, water quality, and general care. Ensuring that their specific needs are met will often result in a long, healthy life.


Rasboras showcase a vibrant spectrum of colors ranging from reds to silvers, with intricate patterns that vary among species. Some common types like the Harlequin Rasbora display a unique black triangular patch, starting from the dorsal fin and tapering off near the caudal fin. The vibrancy of their colors can often be a strong indicator of their health, with stressed or sick fish appearing dull.

Average Size

Depending on the specific species, Rasboras can vary in size. While many popular aquarium species, like the Harlequin Rasbora, average around 1.5 to 2 inches, others can grow up to 6 inches. However, most Rasboras kept in aquariums are on the smaller end of the spectrum.

Rasbora Care

Tank Size

For the smaller species of Rasboras, a minimum of 10 gallons is advised, though larger tanks are always better as these fish love to school and swim around. For larger Rasbora species, a more spacious tank is required.

How To Set Up Their Tank

When setting up a tank for Rasboras, it’s essential to mimic their natural environment. A sandy or fine gravel substrate is ideal. Incorporate live plants, such as Java moss and ferns, to provide shelter and play areas. Driftwood and rocks can also be added for more hiding spaces and to give the tank a more natural appearance.

Lighting Requirements

Moderate lighting is ideal for Rasboras, which will not only highlight their colors but also support the growth of live plants in the tank. Using LED lighting with adjustable settings can be beneficial, as it allows you to replicate a day-night cycle.


Rasboras thrive in slightly acidic to neutral water, making a pH level of 6.0 to 7.5 optimal. Regular testing and adjustments, when necessary, can help maintain this range.


A consistent temperature range between 74°F and 82°F (23°C – 28°C) is essential for Rasboras. Investing in a good quality aquarium heater and thermometer is crucial for monitoring and maintaining this.

Water Parameters

Soft to medium-hard water is best for Rasboras. Regular water changes, ensuring that the water is free from harmful chemicals, and maintaining consistent water parameters play a vital role in their health.

Disease Potential

Rasboras, like many freshwater fish, can be susceptible to common diseases like Ich or fin rot. Quarantine new fish and plants, maintain good water quality, and feed a balanced diet to prevent most ailments.

Food & Diet

Rasboras are omnivorous and have a varied diet in the wild, which includes small insects, crustaceans, and plant matter. In an aquarium, a high-quality flake or pellet food can be their staple, but this should be complemented with live or frozen foods like brine shrimp, daphnia, or bloodworms for nutritional diversity.

Behavior and Temperament

Rasboras are peaceful and social fish. They are known to form tight-knit schools, especially when threatened, and exhibit intricate swimming patterns. Their schooling nature and active behavior make them entertaining to watch.

Tank Mates

Given their peaceful nature, Rasboras are compatible with a variety of tank mates. They can be kept with other peaceful community fish such as tetras, guppies, and small catfish. It’s essential to avoid aggressive or much larger fish that may see Rasboras as prey.


Rasboras can be bred in captivity, though some species are more challenging than others. It’s often recommended to set up a separate breeding tank with soft water and plenty of plants. Once eggs are laid, they typically hatch within a day or two. Fry can be fed infusoria or finely crushed flake food until they are large enough for regular feedings.

Rasbora FAQs (Frequently Asked Questions)