Emerald Dwarf Rasbora (Danio erythromicron)

The Emerald Dwarf Rasbora is a tiny, shy, and incredibly beautiful fish native to Lake Inle in Myanmar. It features a distinctive series of deep emerald-green or blue vertical stripes over a pinkish-orange base, with a prominent dark spot at the base of the tail. They have a delicate, "painted" look that becomes more intense as they settle into a well-planted environment. Unlike many other danios, they have a hovering, "dart-and-stay" swimming style that is fascinating to watch.

Key Information

• Common Name: Emerald Dwarf Rasbora, Crossbanded Dwarf Danio

• Scientific Name: Danio erythromicron

• Origin: Myanmar (Lake Inle)

• Max Size: 2–2.5 cm

• Lifespan: 3–5 years

• Temperament: Peaceful but very shy

• Diet: Omnivore – Requires tiny foods. High-quality crushed flakes, micro-pellets, and baby brine shrimp or daphnia are ideal.

• Care Level: Moderate (Due to shyness and specific water preferences)

Water Parameters

Unlike many South American fish, these Myanmar natives prefer slightly harder, more alkaline water.

Parameter	Value
Temperature:	20–25°C
pH:	7.0–8.0
Hardness:	10–20 dGH
Minimum Tank Size:	30L+ (Best in 50L+ for a larger group)

Behaviour & Tank Compatibility

These are schooling fish and must be kept in a group of 10–12 or more. Because they are naturally timid, a larger group helps them feel brave enough to swim in the open. They are peaceful community fish and are excellent for "Nano" setups. Ideal tank mates include other small, peaceful species like Celestial Pearl Danios, Endlers Livebearers, and Neocaridina Shrimp. Avoid keeping them with large or high-energy fish that will intimidate them and keep them hiding in the plants.

Ideal Tank Setup

• Dense Planting: Crucial. They need a forest of plants (Java Moss, Hygrophila, and Rotala) to feel secure. If the tank is too "open," they will hide 24/7.

• Rockwork: Since they come from a lake with limestone surroundings, adding some smooth stones can help maintain the hardness they prefer.

• Low Flow: They are not strong swimmers and prefer the calm, still waters of a lake environment.

• Dark Substrate: Using dark soil or sand makes their emerald bars stand out vividly.

• Floating Plants: These help diffuse the light, making the fish feel more protected from "predators" above.

Why Choose the Emerald Dwarf Rasbora?

The Emerald Dwarf Rasbora is for the aquascaper who loves intricate textures. Their vertical banding provides a visual rhythm that differs from the horizontal stripes of most small fish. While they require a bit of patience to get them to "come out of their shell," the reward is a tranquil, beautiful display of one of Myanmar’s most unique aquatic treasures.