Kubotai Rasbora

Microdevario kubotai

Also known as: Green neon rasbora, Neon green rasbora, Microrasbora kubotai

Water Parameters

• Temperature: 22–27°C
• pH: 6–7.5
• Hardness (GH): 36–179 ppm (2–10 dGH)

Values above are general hardness (GH). For carbonate hardness (KH), the buffer that keeps pH stable, see the water parameters guide.

Care Summary

One of the most vivid of the micro-rasboras: barely 2cm long but a luminous metallic green that, in a large shoal moving through a planted tank, reads like a drifting cloud of green light. The kubotai rasbora is an active, social, open-water schooler that needs numbers more than almost any other nano fish, rewarding a group of fifteen or more with bold mid-water shoaling and disappointing in small groups by hiding away. It has a tiny mouth and needs correspondingly small foods (crushed flake, micro-pellets, baby brine shrimp) and a mature, stable, planted tank. Hardy enough once settled, but best treated as a fish for an established nano aquarium rather than a brand-new one. A spectacular, low-cost centrepiece for a dedicated nano shoal.

Tankmates

A tiny, brilliant apple-green schooling fish that must be kept in a large group, eight at an absolute minimum and ideally fifteen or more, to feel secure and shoal in the open; in small numbers it is shy and spends its time hidden. Its minute size makes it genuinely shrimp-safe, even with shrimplets, and an ideal companion for a planted nano or shrimp tank, but equally it is small enough to be eaten by almost any larger fish, so keep it only with other micro-species. Pair it with chili rasboras, ember tetras, celestial pearl danios, and dwarf shrimp. A densely planted tank with open mid-water swimming lanes shows the school to best effect.

Compatible with

• Chili Rasbora
• Ember Tetra
• Celestial Pearl Danio
• Pygmy Corydoras
• Otocinclus
• Cherry Shrimp
• Sparkling Gourami

Avoid keeping with

• Betta
• Angelfish
• Large Cichlids
• Fin Nippers
• Any Larger Fish

Common Problems

• shyness and hiding in groups smaller than 8
• difficulty taking large foods (needs small particle sizes)
• stress in new or unstable tanks
• predation by any larger tankmate

Sources: seriouslyfish.com, fishbase.org · Last updated: 2026-06-20