Why are my Neon Green Rasboras looking pale or losing their colour?

Loss of colour is typically a sign of stress. This can be caused by poor water quality, a shoal size that is too small, lack of hiding spaces, or lighting that is too bright and harsh. Ensuring they are in a group of at least 8 in a well-planted tank usually resolves this.

How many Neon Green Rasboras should I keep together?

You should keep an absolute minimum of 8 individuals, though a group of 12 or more is highly recommended. The larger the shoal, the more confident and colourful they will be.

Can they live safely with Cherry Shrimp?

Yes, they are generally fantastic tankmates for Cherry Shrimp. Their mouths are much too small to harm adult or juvenile shrimp, though they might opportunistically pick at newborn, microscopic shrimplets if they catch them in open water.

What is the best way to feed such a tiny fish?

Due to their tiny mouths, standard fish foods will be too large. You must crush high-quality flakes into a fine powder or buy specialised micro-pellets. Supplementing this with live or frozen baby brine shrimp, cyclops, and microworms will keep them in peak condition.

Do Neon Green Rasboras need a heater?

Yes. They are tropical fish from Southeast Asia and require a consistent water temperature between 20°C and 27°C to thrive and maintain a healthy immune system.

FreshwaterTropicalIntermediate

Neon Green Rasbora

Microdevario kubotai

A striking, neon-green nano fish perfect for heavily planted aquariums and peaceful micro-community setups.

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Ideal Conditions

Temperature: 20 – 27 °C
pH range: 6 – 7
Hardness: 2 – 10 dGH
Adult size: 1.5 – 2 cm
45 Litres (minimum for a shoal): 45 litres+
Lifespan: 3 – 5 years
Diet: Omnivore/Micro-predator
Water flow: moderate
Preferred setup: Dense planting, dark substrate, and floating plants to diffuse lighting.

About the Neon Green Rasbora

The Neon Green Rasbora (Microdevario kubotai) is a highly sought-after micro-fish, celebrated for its brilliant, iridescent green-gold colouration. Endemic to the clear, moderately flowing forest streams of Thailand and Myanmar, these tiny cyprinids rarely exceed two centimetres in length. Their vivid hues contrast beautifully against dark substrates and lush aquatic foliage, making them a superb, dynamic centrepiece for nano and meticulously aquascaped tanks.

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Where Neon Green Rasbora comes from

Native range

Southeast Asia, Tenasserim river basin

Countries / regions

Thailand, Myanmar

Habitat

Clear, moderately flowing forest streams with submerged vegetation and leaf-litter substrates.

Primarily found in the upper reaches of the Khlong Kra Buri and adjacent drainages on the Malay Peninsula.

Similar species

Chilli Rasbora
Boraras brigittae
Celestial Pearl Danio
Danio margaritatus
Emerald Dwarf Rasbora
Danio erythromicron

We’re adding more full species guides as the catalogue grows.

Compatible tank mates

Reviewed guidance based on this species' recorded traits.

View all compatibility

Cherry Shrimp
Neocaridina davidi
The incredibly small mouth of the rasbora means adult cherry shrimp are entirely safe, though microscopic shrimplets may occasionally be eaten.
Great
Pygmy Corydoras
Corydoras pygmaeus
Both are peaceful, nano-sized fish that occupy different swimming zones, making them perfect companions in a small setup.
Great
Chilli Rasbora
Boraras brigittae
Shares identical water parameter requirements and peaceful temperament; their red colouration provides a stunning contrast to the green.
Great
Betta Splendens
Betta splendens
While physically small enough to cohabit, a Betta may view these tiny rasboras as food, and the rasboras' fast swimming can sometimes stress a slower-moving Betta.
Compatible with caution
Angelfish
Pterophyllum scalare
Angelfish will easily fit a Neon Green Rasbora into their mouths and view them purely as a snack.
Not recommended

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