Green Kubotai Rasbora – A Neon Flash of Nature’s Brilliance

Small in size but dazzling in color, the Green Kubotai Rasbora (Microdevario kubotai) is a nano fish that brings a radiant glow to freshwater aquariums. Its electric green body and peaceful temperament make it a favorite among aquascapers and nano tank keepers alike. Whether you're just starting out or have a well-established planted aquarium, the Kubotai Rasbora is a perfect touch of vivid life.

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Origins & Natural Habitat

Native to the forest streams and rivers of southern Thailand and Myanmar, the Green Kubotai Rasbora thrives in shallow, slow-flowing waters with dense vegetation and soft, slightly acidic water. These waters are often shaded by overhanging foliage, making the fish’s bright green coloration an adaptation that blends in with its lush environment.

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Appearance

The Kubotai Rasbora is unmistakable thanks to its vibrant neon green to yellowish-green body, often shimmering with an almost metallic sheen under aquarium lighting. These tiny fish reach just about 1 inch in length when fully grown, making them one of the smallest and most colorful schooling fish available in the hobby.

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Behavior & Temperament

These rasboras are extremely peaceful and social, best kept in schools of 6 or more to feel secure and display their best colors and natural behavior. When kept in a well-planted tank with dim lighting, they create a mesmerizing effect as they dart and school together.

Their gentle nature makes them excellent tankmates for other small, peaceful species such as:

• Chili Rasboras

• Ember Tetras

• Dwarf Corydoras

• Small Gouramis

• Freshwater shrimp

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Aquarium Requirements

• Tank Size: 5 gallons minimum (10+ gallons preferred for larger schools)

• Temperature: 72–80°F

• pH: 6.0–7.5

• Water Hardness: Soft to moderately hard

• Lighting: Moderate to low lighting enhances their color

• Aquascape: Dense planting, driftwood, and gentle filtration; blackwater or tannin-rich setups are ideal

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Diet

Green Kubotai Rasboras are micro-predators and thrive on small, protein-rich foods. Their diet should include:

• Micro pellets or crushed flakes

• Frozen or live baby brine shrimp, daphnia, and cyclops

• Occasional crushed veggie-based flakes for variety

Feed them small portions twice daily for best health and coloration.

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Breeding

Breeding can occur in a well-maintained, planted aquarium, though fry survival is low in community tanks. These rasboras are egg scatterers and do not guard their eggs or fry. If breeding is desired, a separate breeding tank with fine-leaved plants or spawning mops is recommended.

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Final Thoughts

The Green Kubotai Rasbora is a tiny fish with huge visual impact. Perfect for planted and nano aquariums, it brings a neon-green splash of life and movement. Low-maintenance, peaceful, and endlessly captivating, this micro fish is a must-have for hobbyists who love color and grace in equal measure.

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