Brilliant Rasbora/Red Tail Rasbora
Rasbora einthovenii

Care Level



Fore Ground



Reef Compatible


Plant Safe


Max Size

2 - 5

Minimum Tank Size



Black, Red, White, Yellow



Water Conditions

73-77° F, KH 2-5, pH 6.0-6.5


General: The brilliant rasbora is a "blackwater" schooling fish species from Southeast Asia, including the countries of Thailand, Singapore, Malaysia. They have naturally adapted to acidic, stained, and stagnant water conditions. In order to provide optimal living conditions for this relatively hardy fish species, it is best mimic these environmental characteristics.

Dimorphism: Once mature, the brilliant rasbora male will gain a more noticeable red and yellow coloration. The female brilliant rasbora will retain the silver and white coloration. Also, the female will take on a more gravid appearance when ready to reproduce.

Fecundity: There have been very few reports of this species breeding in the home aquarium. In theory, based on the observation of closely related species, brilliant rasboras will scatter eggs amongst plants or a spawning mop. It will take around two days for the eggs to hatch, and at first fry can be fed infusoria. Once they attain a large enough size they can be switched to live baby brine shrimp.

Water Chemistry: 73-77° F, KH 2-5, pH 6.0-6.5

Aquarium Diet: Brilliant rasboras are carnivores and will accept brine shrimp, blackworms, fish flake, and omnivore pellets.

Compatibility: Brilliant rasboras are typically compatible with other rasboras such as the harlequin rasbora (Rasbora heteromorpha) and scissortail rasbora (Rasbora trilineata), tetras such as black neon tetras (Hyphessobrycon herbertaxelrodi), danios such as the pearl danio (Danio albolineatus), rainbowfish such as the dwarf rainbowfish (Melanotaenia praecox), dwarf South American cichlids such as the blue ram (Mikrogeophagus ramirezi), and Corydoras species.

Author: Grant Stevens