Pygmy Corydoras
Pygmy Corydoras (Corydoras pygmaeus) is one of three true dwarf corydoras species and one of the most charming nano fish in the freshwater hobby. A fine black horizontal stripe runs the length of the silver body, creating a clean, crisp pattern that reads clearly even on this tiny fish. Unlike most corydoras, Pygmy Corydoras are genuine mid-water schoolers — they hover in open water in tightly packed, shimmering clouds rather than staying on the bottom.
Feeding & Care Tip: Because Pygmy Corydoras feed mid-water rather than on the bottom, Hikari Micro Pellets are the preferred daily staple — the semi-sinking particles suit their feeding style perfectly. Sera Vipachips Tropical Wafers can be crushed and offered as an alternative. Supplement 2–3× per week with Hikari Frozen or Freeze-Dried Baby Brine Shrimp. Feed small amounts 2–3 times daily.
Native to the Rio Madeira basin in Brazil, Pygmy Corydoras inhabit slow-moving, heavily vegetated streams and flooded areas. The species name pygmaeus simply means 'dwarf.' In the aquarium they thrive in planted setups with soft, slightly acidic to neutral water, open swimming space in the mid-water column, and gentle filtration.
Keep in groups of at least ten — Pygmy Corydoras are highly social and the schooling behavior is most spectacular in larger groups. A cloud of twenty or more hovering in the mid-water of a planted tank, turning and flashing in unison, is one of the most beautiful sights available in nano fishkeeping. Completely peaceful with all non-predatory species.
Substrate quality still matters for this species despite their mid-water habits — they do descend to the bottom to rest and forage, so fine sand is still recommended. Pristine water quality is essential. Do not keep with fish large enough to eat them.
Care & Ideal Parameters
| Difficulty | Easy |
| Temperament | Peaceful — Nano Community |
| Typical Adult Size | 1.2 inches (3 cm) |
| Min. Group Size | 10 minimum — groups of 20+ produce spectacular schooling |
| Ideal Temp | 72–79°F (22–26°C) |
| Ideal pH | 6.0–7.0 |
| Ideal GH | 2–10 dGH |
| Ideal KH | 1–6 dKH |
| Staple Food | Hikari Micro Pellets; Sera Vipachips Tropical Wafers |
| Treat / Supplement | Hikari Frozen or Freeze-Dried Baby Brine Shrimp |
| Origin | Rio Madeira basin, Brazil |
| Notes | Mid-water schooler — does not stay on the bottom like most corys. Micro Pellets preferred over Sinking Wafers. One of the three true dwarf corydoras species. Keep in groups of 10+. |
