
Emerald Dwarf Danio
Danio erythromicron
- Care level
- Intermediate
- Adult size
- 2.5–3 cm
- Minimum tank
- 45 litres
- Temperature
- 20–24 °C
Species profile
Danio nigrofasciatus
Common names: Dwarf Spotted Danio, Dwarf Danio

Dwarf Spotted Danio is a small to medium schooling danio requiring a group, a secure lid, clean oxygen-rich water, and at least 54 litres.
A small bronze-silver danio with dark longitudinal stripes broken by spots and short vertical marks.
Smaller and more finely patterned than Zebra Danio, with spotted or interrupted dark markings.
Adult females are generally fuller-bodied and slightly larger. Mature males are usually slimmer and show stronger colour, especially during courtship.
Keep a group of at least 8 in an aquarium at least 60 cm long. Provide open swimming space, secure cover, efficient filtration, and moderate water movement.
Use plants, wood, and rounded stone around the margins while preserving a clear central swimming area.
Dense planting, moss, fine-leaved cover, and shaded margins help these small fish feel secure, while a clear central area allows normal group movement.
Dwarf Spotted Danio is a social, active schooling fish that should be maintained with its own kind. Most chasing is part of normal group interaction, but cramped quarters or a group that is too small can concentrate aggression.
Maintain at least 8, preferably 12 or more. A larger group produces more natural schooling and spreads chasing. Not truly territorial, although males may spar or defend short-lived display positions within the group. These smaller species often look more confident in a well-planted aquarium and may spend less time in the open when kept with large or restless tankmates.
Best kept with small, peaceful fish that will not dominate feeding time or keep the group in hiding. Avoid large, predatory, highly territorial, or very boisterous tankmates. Adult dwarf shrimp may coexist in a mature planted tank, but eggs, larvae, and shrimplets remain potential food.
Keep the water clean and oxygen-rich. Soft to moderately hard water is preferable, with no sudden chemistry changes.
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Control the flow and keep the intake clear of fish and delicate planting. Clean the areas appropriate for your substrate and layout rather than disturbing the entire planted bed.
Use quality small flakes or pellets, supported by Artemia, Daphnia, mosquito larvae, and other suitably sized live or frozen foods. Offer modest portions that the school can finish promptly, and distribute food across the surface or current so subordinate fish have access. A varied diet supports colour, condition, and breeding readiness better than relying on one dry food. These small fish can be hesitant feeders in busy communities, so confirm that food reaches them.
Feed small portions once or twice daily. Active danios feed quickly, so check that slower tankmates receive food.
An egg-scattering spawner with no parental care. Condition adults well, then use fine-leaved plants, spawning mops, mesh, or marbles to protect eggs from the adults. Remove the breeders after spawning and raise the fry on infusoria or very fine prepared food before moving to microworms and Artemia nauplii. For uncommon species, keep detailed notes on temperature, timing, adult condition, and fry growth because dependable species-specific aquarium reports may be limited.
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