Green Kubotai Rasbora (Microdevario kubotai): A Complete Care & Aquascaping Guide

Introduction

Electric green, endlessly active, and strikingly unique, the Green Kubotai Rasbora has become a favourite among aquascapers looking for a bold yet refined schooling species. Their neon-green bodies shimmer with under aquarium lighting, creating an eye-catching contrast against lush plants and natural wood. 

Species Overview

• Common Name: Green Kubotai Rasbora / Neon Green Rasbora

• Scientific Name: Microdevario kubotai

• Origin: Thailand & Myanmar (Mekong tributaries)

• Adult Size: 2–2.5 cm

• Lifespan: 4–5 years

• Temperament: Peaceful, energetic, tight-schooling

• Difficulty: Easy–Moderate

• Ideal For: Planted tanks, nature aquascapes, nano communities

Natural Habitat

This species originates from clear forest streams and shallow tributaries rich in submerged vegetation. The water is typically clear, warm, and moderately soft with gentle flow. Their natural environment is bright and plant-dense, which is why they adapt so well to aquascapes rich in stems and mosses.

Appearance & Behaviour

Colouration

Green Kubotai Rasboras are famous for their neon-lime green bodies, which glow intensely under quality aquarium LEDs. Their colour becomes even stronger even showing a blue shimmer in:

• Well-established planted tanks

• Stable water conditions

• Diets rich in live micro foods

Behaviour

These rasboras are true schooling fish, staying in tight groups and moving rhythmically across the tank. They are curious, energetic, and confident when kept in groups of 10–20+.

Tank Level

Primarily mid-water, often sweeping across open areas while darting into plant cover.

Tank Requirements

Minimum Tank Size

• Recommended: 35 litres+
  While small, their active nature means they benefit from longer tanks with horizontal swimming space.

Water Parameters

• Temperature: 22–28°C

• pH: 6.0–7.5

• Hardness: Soft to moderate

• Flow: Gentle to moderate

• Lighting: Medium to bright (colour displays especially well under clean lighting)

Aquascaping Tips for Green Kubotai Rasboras

This species is a showstopper in most aquascaping styles. To truly highlight them, consider:

• Bright, plant-rich scapes — their neon colour contrasts beautifully with deep greens.

• Stems & mosses — Rotala, Pogostemon, Limnophila, and Riccardia provide natural cover.

• Open mid-water zone for active schooling behaviour.

• Light substrates or mid-tone soils to avoid dulling their colour.

• Long, shallow tanks to enhance schooling movement.

They are particularly stunning in nature-style aquascapes, dutch-style tanks, and vibrant community layouts.

Tank Mates

Green Kubotai Rasboras are peaceful and compatible with many small, community-safe species.

Suitable Companions

• Other micro rasboras

• Ember tetras

• Celestial Pearl Danios

• Pygmy Corydoras

• Otocinclus

• Caridina & Neocaridina shrimp

• Peaceful nano gouramis (e.g., sparkling gourami)

Avoid

• Larger or predatory species

• Fin-nippers

• Fast, boisterous fish that may outcompete them for food

Diet & Feeding

Though small, they’re enthusiastic feeders. Offer a varied mix:

• Fine granules & micro pellets (Fish Pro Micro Munch, Fish Pro Fish Feast, Fish Pro Bright Bites) Check out the full range of >Fish Pro foods 

Small, frequent feedings help maintain colour vibrancy and activity.

Breeding Green Kubotai Rasboras

Breeding is achievable with the right setup but requires attention due to their small egg size.

Requirements

• Soft, clean water

• Dense plants or spawning mops

• Gentle flow
  

Breeding Process

1. Condition adults with high-quality live foods.

2. Use a planted, dim breeding tank.

3. Eggs scatter among plants and hatch within 24–36 hours.

4. Remove adults, as they will eat the eggs.

5. Fry require microscopic food at first before transitioning to baby brine.

Common Health Considerations

Green Kubotai Rasboras are relatively hardy, but sensitive to:

• Poor water quality

• High nitrates

• Sudden parameter swings

• Low oxygen levels

Clear, clean, stable water and a mature tank are essential. Their small size also makes them prone to stress if kept with unsuitable tank mates or in low numbers.

Why Green Kubotai Rasboras Are Great for Planted Tanks

• Their electric green colour is unmatched by most freshwater fish

• Perfect for tanks that need a bright, eye-catching schooling species

• Excellent for nature, Dutch, and modern aquascapes

• Peaceful and active without being disruptive

• School tightly, adding dynamic movement to layouts

They’re one of the most visually impactful yet peaceful nano fish available.

Conclusion

The Green Kubotai Rasbora is a brilliant and lively addition to planted aquariums, offering unmatched colour and energetic schooling behaviour. With stable conditions, plenty of plant cover, and a peaceful environment, these luminous fish will thrive and become the centrepiece of any aquascape they inhabit.