Neon green rasbora
Microdevario kubotai
Neon green rasbora (Microdevario kubotai) is a freshwater species with an adult-size reference of about 2 cm. It needs at least 50 litres and 10 individuals, with its social and territorial profile taken into account.
Water Temperature
22 - 27 °C
pH Value
6 - 7
Water type
Freshwater
Tank level
Middle
Adult size
2 cm
Minimum tank volume
>= 50 L
Minimum group
>= 10
GH
1 - 10 dGH
KH
1 - 5 dKH
TDS
25 - 200 ppm
Conductivity
39 - 313 uS/cm
Species description
Geographical Origin and Habitat: A freshwater species; the enclosure should provide stability, oxygenation, space and shelter consistent with its behaviour without turning one habitat description into a mandatory recipe.
Taxonomy and Morphology: The accepted scientific name is Microdevario kubotai; the verified classification records genus Microdevario, family Danionidae, subfamily Danioninae, order Cypriniformes. Historical names remain searchable as synonyms rather than separate species.
Social Behavior: Neon green rasbora is gregarious and should be kept in a school. The minimum reference is 10 individuals; sex, maturity and available space can require a more conservative composition. Observe access to food, resting behaviour, chasing and use of shelter. Isolation, persistent competition or aggression means the number, composition or environment needs to be corrected.
Coloration and Sexual Dimorphism: Colour and shape can vary with age, sex, physiological state and environmental conditions. Identification and sexing require recognized species-level characters; one appearance or photograph is not enough.
Care, breeding and tankmates
Aquarium Setup: Neon green rasbora needs an aquarium of at least 50 litres, sized for adult body size and a minimum group of 10 individuals. Filtration, shelter and swimming room must match the species and the actual number kept. Volume alone does not make an enclosure suitable: tank shape and length, usable area, oxygenation and the ability to separate territories must reflect adult behaviour.
Diet and Feeding: The recorded diet is omnivorous. Offer appropriately sized foods varied within that category, and adjust quantity and frequency from actual intake, body condition and leftovers. One food or a fixed schedule is not suitable for every age and situation.
Water Quality: Maintain stable, well-oxygenated water appropriate to a freshwater species; the card's reference values are 22–27 °C, pH 6–7. Verify conditions with reliable tests and size maintenance and filtration to the actual load. Ranges are not automatic thresholds for treatment or rapid chemical correction.
Compatibility and Cohabitation: The cohabitation profile is suitable for a compatible community, with a generally active temperament. Keep at least 10 individuals; tankmates, stocking density and decor must allow escape, rest and feeding without excessive competition. Watch interactions especially during feeding, maturity and breeding. Persistent chasing, injury or exclusion from food requires a change in stocking or layout, or separation of the animals.
Aquarium Breeding: The recorded reproductive profile is “oviparity”. Breeding should be attempted only with healthy adults, separation capacity and a plan for eggs or young. Do not treat unverified triggers, sex ratios or hatch times as universal for this species.
Risks and Diseases: Prevent problems through quarantine of new arrivals, stable water, appropriate feeding and daily observation. Similar signs can have different causes, so check parameters, history and diagnosis before medication. Follow the product label and qualified aquatic-veterinary advice; there is no universal reduced dose for a species or family.
Geographic origin and distribution
A freshwater species; the enclosure should provide stability, oxygenation, space and shelter consistent with its behaviour without turning one habitat description into a mandatory recipe.
Origin
South and Southeast Asia
Fish profile
- Temperament
- Active
- Neon green rasbora has a generally active temperament. Insufficient space, an unsuitable social ratio or incompatible tankmates can substantially change observed behaviour.
- Diet
- Omnivore
- They are micro-predators that feed on tiny invertebrates and zooplankton in the wild. In the aquarium, they readily accept crushed high-quality flakes and micro-pellets. Supplementing their diet with small live or frozen foods like baby brine shrimp and daphnia will greatly enhance their vibrant green coloration.
- Life expectancy
- 3-5 years
- Adult size
- 2 cm
- Sex ratio
- School
- Neon green rasbora is gregarious and should be kept in a school. The reference minimum is 10 individuals and must not be read as permission to overcrowd the aquarium.
- Feeding frequency
- 2-3 times daily
- Due to their small stomachs and active swimming habits, they benefit from being fed small amounts two to three times daily. Providing multiple small feedings ensures they receive enough calories without causing food waste to rot in the tank. Only offer what they can completely consume in about a minute.
- Bioload
- Low
- The Neon Green Rasbora is a very small nano fish with an exceptionally low bioload. They produce minimal waste, making them perfect candidates for small, heavily planted aquariums. Even so, maintaining excellent water quality through regular maintenance is critical as they are sensitive to parameter fluctuations.
- Flow
- Strong
- They hail from slow to moderately flowing rivers and streams in Southeast Asia. Providing a gentle to moderate water flow will encourage their natural schooling behavior and keep them active. Extremely strong currents should be avoided as it will quickly exhaust these tiny fish.
- Jump risk
- No
- Reproduction
- Oviparous
- They are continuous egg scatterers that provide no parental care whatsoever to their offspring. Breeding in a dedicated setup involves providing soft, slightly acidic water and dense vegetation like java moss. The parents will eagerly consume their own eggs, so they must be removed once spawning has occurred.
- Compatibility & tankmates
- Community
- The cohabitation profile is suitable for a compatible community, with a generally active temperament. Keep at least 10 individuals; tankmates, stocking density and decor must allow escape, rest and feeding without excessive competition. Watch interactions especially during feeding, maturity and breeding. Persistent chasing, injury or exclusion from food requires a change in stocking or layout, or separation of the animals.
- Tank level
- Middle
- They are highly active fish that predominantly occupy the middle and upper regions of the water column. They will actively school and explore all open areas of the tank while darting into plants for cover when needed. Providing adequate swimming space alongside dense planting is the ideal setup.
Scientific Parameters & Models
FishBase
Window to the official scientific data of the species
FishBase v25.04Data synced on: 06/15/2026
- Trophic level
- 3 ± 0.3 se
- Resilience
- High (less than 15 months)
- Phylogenetic uniqueness (PD50)
- 0.625
- Bayesian Length-Weight
- a = 0.00977, b = 3.04
- VulnerabilityLow vulnerability (10 / 100)
Image gallery
Licensed images linked to the species or, when marked, to the closest representative taxon.
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