Why are my Emerald Dwarf Rasboras always hiding?

This species is naturally very timid. If they are hiding constantly, it usually means their shoal is too small (fewer than 10 fish), the tank lacks sufficient plant cover, or their tankmates are too large and active.

Can I keep Emerald Dwarf Rasboras with Celestial Pearl Danios?

Yes, they make excellent tankmates as they originate from the exact same habitat in Lake Inle and require the same water conditions. However, be cautious if you plan to breed them, as the two closely related species can hybridise.

Do Emerald Dwarf Rasboras need a heater?

Yes, they are tropical fish, but because they come from a higher-altitude lake, they prefer the cooler end of the tropical spectrum, ideally between 20°C and 24°C.

Will they eat my cherry shrimp?

Adult cherry shrimp are completely safe from these tiny fish. However, like almost all fish, they may occasionally snack on newly hatched, free-swimming shrimplets if they catch them.

What is the best food for them?

Because of their tiny mouths and micro-predator nature, the best foods are live or frozen baby brine shrimp, Daphnia, and microworms. They can also be fed high-quality micro-pellets or crushed flakes.

FreshwaterTropicalIntermediate

Emerald Dwarf Rasbora

Danio erythromicron

A striking micro-fish endemic to Myanmar's Lake Inle, prized for its vivid emerald banding and peaceful nature in nano aquariums.

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Ideal Conditions

Temperature: 20 – 24 °C
pH range: 7 – 8
Hardness: 12 – 20 dGH
Adult size: 1.5 – 2 cm
45L (Standard 2-foot or large nano): 45 litres+
Lifespan: 3 – 5 years
Diet: Micro-predator/Omnivore
Water flow: gentle to moderate
Preferred setup: Densely planted with open swimming spaces and line-of-sight breaks.

About the Emerald Dwarf Rasbora

The Emerald Dwarf Rasbora (Danio erythromicron) is a captivating, diminutive cyprinid that has secured a loyal following among nano aquarium enthusiasts. Once classified under the Microrasbora genus, it is actually a true danio closely related to the famous Celestial Pearl Danio. Its brilliant tiger-like emerald striping and rosy-orange fins make it a jewel of the planted aquarium, provided its specific environmental needs are met.

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Is it right for your tank?

Check Emerald Dwarf Rasbora against a habitat you already keep. We compare water type, temperature, pH, adult size, group needs and everything living there.

Where Emerald Dwarf Rasbora comes from

Native range

Southeast Asia

Countries / regions

Myanmar

Habitat

Endemic to Lake Inle and its surrounding watershed. Found in clear, shallow margins densely choked with aquatic plants and floating islands of vegetation.

Listed as Endangered on the IUCN Red List due to habitat degradation, pollution, and the introduction of invasive species in Lake Inle.

Similar species

Celestial Pearl Danio
Danio margaritatus
Glowlight Danio
Danio choprae
Dwarf Rasbora
Boraras maculatus

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

Celestial Pearl Danio
Danio margaritatus
Shares the same natural habitat in Lake Inle, requires identical water parameters, and is similarly sized.
Great
Cherry Shrimp
Neocaridina davidi
Adult shrimp are completely safe, and they both thrive in harder, slightly alkaline water.
Great
Asian Stone Catfish
Hara jerdoni
A highly peaceful, diminutive bottom-dweller that appreciates the slightly cooler temperatures these danios prefer.
Great
Endler's Livebearer
Poecilia wingei
They share water parameters perfectly, but male Endlers can sometimes be too active and outcompete the shy danios for food.
Compatible with caution
Pygmy Corydoras
Corydoras pygmaeus
Very peaceful, but they generally prefer softer, more acidic water than the ideal Lake Inle parameters.
Compatible with caution
Angelfish
Pterophyllum scalare
Angelfish grow large enough to easily swallow an adult Emerald Dwarf Rasbora whole.
Not recommended
Tiger Barb
Puntigrus tetrazona
Far too boisterous and aggressive; they will severely stress and potentially attack the timid micro-fish.
Not recommended

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