Pygmy cory
Gastrodermus pygmaeus
This dwarf cory often swims in midwater too. A social armoured catfish that searches the substrate for food. It needs dedicated sinking food, not just leftovers.
At a glance
- Scientific name
- Gastrodermus pygmaeus
- Dutch name
- Dwergpantsermeerval
- Water temperature
- 22–26 °C
- pH
- 6.4–7.4
- Adult length, up to approximately
- 3 cm SL
- Experience
- Basic knowledge
- Also known as
- Corydoras pygmaeus
- General hardness (GH)
- 0–8 °dGH
- Starting footprint
- 60 × 30 cm
- Swimming or living zone
- Several water levels
- Flow
- Moderate, with sheltered areas
This is a documented adult size, not a measured average. SL means body length excluding the tail fin. Sex, origin and cultivated form can affect size.
Care guidance; origin and captive breeding can change requirements. Some ranges are deliberately narrower than natural extremes in the source. Adjust water gradually and keep ammonia and nitrite at zero.
Tank sizes are editorial starting points for adults, not guarantees for a complete stocking plan. Group size, tank height, swimming length and territories may require a larger aquarium.
Origin
South America — Madeira
Habitat & setup
Freshwater bottoms with sand and cover; avoid sharp substrates.
Diet
Dedicated sinking complete food and small frozen foods. Ensure portions reach the bottom.
Behaviour & grouping
At least 6 of the same species; larger groups with enough room.
Living with other animals
Other peaceful fish of suitable size, such as small tetras and calm cory catfish, if water requirements match. Avoid predators.
Possible combinations to investigate further
- Ember tetra
22–26 °C · pH 6.4–7
Reproduction
Egg-laying; eggs and fry usually need separate rearing.
A suitable cover helps prevent escape and jumping. Protect intakes for small animals. Do not use copper-based fish medication with invertebrates.
Sources & image credits
Data compiled on: 2026-09-27. Species sources support identity and care; group sources give general starting points. Practical recommendations are an editorial synthesis.
Photo: Corydoras_pygmaeus_carnat_joel_5.jpg — Carnat Joel. CC BY 2.0.