Kubotai rasbora (green)
Microdevario kubotai
easy careOverview
The green kubotai rasbora (Microdevario kubotai) is a tiny, translucent nano fish that glows an electric neon green when kept well. Native to soft, clear forest streams in Thailand and Myanmar, it is peaceful, shoaling and shy, revealing its best colour only in a large group within a planted tank. Small but eye-catching, it is an ideal shoaling fish for a mature, gently stocked nano community.
Tank & water
A proper shoal is comfortable in a planted 40-litre (10-gallon) tank or larger. These little fish feel safest in numbers and with plenty of cover.
- Temperature: 22–27 °C, held with a small heater.
- Water: soft and slightly acidic to neutral, pH 6.0–7.0, suits them best; they dislike hard, alkaline water.
- Filtration: a gentle sponge filter cleans the water without harming such small fish or creating strong flow.
- Planted: dense plants and dark substrate turn shy, pale fish into confident, glowing green ones.
Feeding
Kubotai rasboras are micropredators with minute mouths. The staple should be fine crushed micro-pellets and powdered foods, supplemented with small live and frozen items — baby brine shrimp, cyclops, microworms and daphnia. Size everything down, feed little and often, and make sure the food actually reaches these small, unassertive feeders.
Tankmates
Keep the company small and gentle. Kubotai rasboras pair beautifully with other calm nano species: chili rasboras, celestial pearl danios, lambchop rasboras, pygmy corydoras, snails and dwarf shrimp. Avoid larger, faster or nippy fish that intimidate them or steal their food.
Give the green kubotai rasbora a mature, soft-water planted nano and a big shoal, and it delivers a splash of living neon green found in few other fish this size.
Kubotai rasbora (green) — frequently asked questions
Why do my kubotai rasboras look pale?
Their neon-green colour depends on feeling secure, so a pale, washed-out kubotai is usually one kept in too small a group or too bare a tank. Keep a shoal of at least eight to ten in a densely planted tank with dark substrate and they colour up strongly.
How many kubotai rasboras should I keep?
Keep a large shoal — at least eight, and ten or more is better. They are naturally shy, and a big group gives them the confidence to swim in the open and display their green colour. Small groups tend to hide.
Are kubotai rasboras suitable for a nano tank?
Yes. At just 2 cm they are true nano fish and a shoal is comfortable in a well-planted 40-litre tank. They pair well with other small, peaceful nano species in a mature, gently stocked setup.
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