Pygmy Corydoras

Corydoras pygmaeus

Also known as: Pygmy cory, Dwarf cory

Water Parameters

• Temperature: 22–26°C
• pH: 6.5–7.5
• Hardness: 36–268 ppm

Care Summary

Among the smallest corydoras species and arguably the most behaviourally interesting: they swim, school, and forage throughout the entire water column rather than confining themselves to the bottom. A school of 10+ pygmy cories darting through midwater is one of the more rewarding sights in nano-tank keeping. Requires a soft sand or smooth gravel substrate to protect their barbels. Often sold in mixed groups with hastatus and habrosus corydoras (sometimes collectively called 'dwarf cories'); these three species are similar but distinct, and identification matters for accurate care.

Tankmates

Unlike larger corydoras species, pygmy cories swim throughout the water column rather than sticking to the bottom; they spend significant time in midwater, particularly when kept in larger groups. Best in groups of at least 8, ideally 10+. Their tiny size makes them safe with most peaceful nano-tank species, including bettas (one of the few corydoras that works in a betta tank). Adult cherry shrimp coexist well, but pygmy cories may eat shrimp fry.

Compatible with

• Betta
• Ember Tetra
• Neon Tetra
• Harlequin Rasbora
• Cherry Shrimp
• Chili Rasbora
• Otocinclus
• Honey Gourami

Avoid keeping with

• Large Cichlids
• Fin Nippers
• Aggressive Tankmates

Common Problems

• damaged barbels from sharp substrate
• stress in groups smaller than 8
• ich
• starvation in tanks with faster mid-water competitors

Sources: seriouslyfish.com, fishbase.org · Last updated: 2026-06-06