Emerald Dwarf Rasbora/Danio

Emerald Dwarf Rasbora / Emerald Dwarf Danio (Danio erythromicron)

Emerald Dwarf Rasboras (Danio erythromicron), also commonly called Emerald Dwarf Danios, are a beautiful nano species with striking blue-green striping and a lot of movement for their size. They stand out in planted aquariums and do especially well when kept in groups with plenty of cover.

At Legacy Line Aquatics, these fish are bred and raised in-house by me in a small-scale, care-first setup. I do not source from mass-production fish farms. My focus is on raising healthy fish with clean water, proper nutrition, and attentive day-to-day care, so you receive fish I’d be confident keeping in my own fish room.

Why Hobbyists Love Emerald Dwarf Rasboras / Danios

• Unique blue/green striping and shimmering body color

• Great nano fish for planted tanks

• Active but peaceful in the right setup

• Excellent schooling fish for smaller aquariums

• Pairs well visually with other small peaceful species

Temperament & Behavior

These fish are small, active, and generally peaceful. They do best in groups and usually become more confident in planted tanks with cover. Like many nano danios, they can be shy in bright/open setups and more natural in structured tanks.

They do best in tanks with:

• Plants and visual cover

• Gentle to moderate flow

• Calm tank mates

• A group of their own kind

Tank Size (Recommended)

• 10 gallon minimum for a species-focused group

• 15–20 gallon preferred for community setups

• Best kept in groups of 8+ for confidence and natural behavior

Water Temperature

• Ideal range: 72–78°F

• Stable, clean water matters more than exact temperature

Tank Mates (Good Choices)

Best tank mates are peaceful nano fish that won’t bully or outcompete them.

Good tank mates may include:

• Celestial Pearl Danios (in appropriate setups)

• Small rasboras

• Ember tetras

• Pygmy corydoras

• Small shrimp (with caution)

Avoid:

• Large fish

• Aggressive or fin-nipping species

• Very fast feeders that dominate food

• Fish large enough to view them as food

Feeding

These fish do best on smaller foods and variety.

Recommended foods:

• High-quality micro pellets

• Crushed flakes

• Frozen micro foods (cyclops, baby brine, etc.)

• Live baby brine shrimp (excellent)

What You’re Getting from Legacy Line Aquatics

When you purchase from me, you’re getting fish that were bred and raised in-house, not mass-imported and flipped. I take a small-scale approach so I can focus on:

• Fish health

• Clean systems

• Proper feeding, mixture of high quality sinking pellets, live baby brine shrimp, frozen bloodworms, frozen brine shrimp, and high quality flakes.

• Parasite free

That matters, especially with nano species.

Shipping & Live Arrival

• Live fish are shipped Monday–Wednesday (weather permitting) to reduce transit risk.

• Please review our How Shipping Works page and DOA policy before ordering.