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Emerald Dwarf Rasbora

Emerald Dwarf Rasbora

Posted by Max Gandara on on 18th May 2025

Emerald Dwarf Rasbora: A Tiny Fish with Big Beauty

In the world of nano aquariums and peaceful community tanks, the Emerald Dwarf Rasbora stands out as a small but spectacular species. With its iridescent green body and vibrant orange fins, this tiny fish brings a dazzling burst of color and energy to any aquascape.

Quick Overview

  • Scientific Name: Danio erythromicron

  • Common Name: Emerald Dwarf Rasbora

  • Size: Up to 2 cm (0.8 inches)

  • Lifespan: 3–5 years

  • Temperament: Peaceful, shy

  • Tank Level: Middle to top

  • Origin: Inle Lake, Myanmar

Why Emerald Dwarf Rasboras Are Special

? Brilliant Coloration
Their emerald-green bodies shimmer under good lighting, and their orange-striped fins provide a contrasting pop of color.

? Perfect for Nano Tanks
Because of their small size, they’re ideal for 5–10 gallon setups or larger, heavily planted tanks where they can school in small groups.

? Peaceful Nature
They are shy but friendly fish that get along well with other peaceful nano species, like chili rasboras, celestial pearl danios, or pygmy corydoras.

? Rare and Exotic
Not as commonly found as other rasboras, owning Emerald Dwarfs adds a touch of uniqueness to your tank.

Care Requirements

Tank Size
Minimum: 10 gallons for a group of 6–8 fish. Larger tanks allow more natural schooling behavior.

Water Conditions

  • Temperature: 22–27°C (72–81°F)

  • pH: 6.5–7.5

  • Hardness: Soft to moderately hard water

Aquascaping Tips

  • Dense planting (Java fern, mosses, Anubias) helps them feel secure.

  • A darker substrate and subdued lighting will enhance their colors.

  • Floating plants provide additional cover to reduce stress.

Diet and Feeding

These omnivores thrive on a variety of foods:

  • High-quality micro-pellets and flakes

  • Frozen foods (daphnia, cyclops, baby brine shrimp)

  • Occasional live food to enhance color and health

Behavior and Tankmates

  • Best kept in schools of at least 6, though 10+ is ideal for more natural behavior.

  • Tankmates should be similarly peaceful and non-aggressive.

  • Avoid larger or boisterous fish, as Emerald Dwarfs are shy and easily intimidated.

Breeding Tips

Breeding in captivity is possible but requires:

  • A separate breeding tank with fine-leaved plants or moss

  • Slightly cooler water to simulate seasonal changes

  • A protein-rich diet to condition the pair

Once eggs are laid, they may scatter throughout the plants. Parents should be removed to prevent egg predation.

Fun Facts

  • Despite the name, Emerald Dwarf Rasbora is technically a danio, not a true rasbora.

  • Native to Inle Lake, a high-altitude freshwater lake in Myanmar known for its unique fish species.

  • Their shimmering green scales change hue slightly depending on lighting conditions and mood.

Conclusion

If you’re looking for a peaceful, colorful addition to your planted tank, the Emerald Dwarf Rasbora is a charming choice. Their stunning colors, peaceful nature, and schooling behavior make them perfect for both beginners and experienced aquarists seeking beauty in a small package.

Keep them in a serene, well-planted environment, and you’ll enjoy a captivating underwater show from some of nature’s most delicate gems.