Common Name: True Pygmy Cory Catfish
Scientific Name: Corydoras pygmaeus
Other Names: Pygmy Cory, Pygmy Corydoras
The True Pygmy Cory Catfish is one of the smallest corydoras in the hobby. Pygmy corydoras are tiny catfish with a silvery-gray body and a dark horizontal stripe. Unlike most corydoras, they often swim in mid-water schools. It is a lively, hardy catfish that adds constant activity to the aquarium. This listing is for a group of 10 fish.
Habitat and Distribution:
Corydoras pygmaeus is native to the Rio Madeira basin of Brazil, where it lives in small streams and along vegetated riverbanks. The water in these habitats is typically warm, soft and slightly acidic.
Size and Lifespan:
It reaches about 1 inch (2.5 cm). With proper care they commonly live 3-5 years.
Diet and Behavior:
Pygmy corydoras are omnivorous and feed on tiny invertebrates in the wild. In the aquarium, offer micro pellets, crushed flakes, baby brine shrimp and daphnia. They are peaceful schooling catfish and should be kept in groups of six or more. Feed a varied diet and remove uneaten food promptly to protect water quality.
Breeding and Reproduction:
Pygmy corydoras are bred regularly in aquariums. They are egg layers that stick their eggs to plants and glass, and the adults do not guard them.
Aquarium Care and Tank Requirements:
A tank of at least 10 gallons is recommended for a group. Provide a sand substrate, plants and gentle filtration. The water temperature should be kept between 72-79°F (22-26°C), with a pH of 6.0-7.5 and soft to moderately hard water. Regular partial water changes are essential to maintain water quality, and new arrivals should be acclimated slowly.
Ideal Tank Mates:
Good tank mates include other tiny, peaceful fish such as small tetras, rasboras and shrimp. Avoid large fish that may eat them. As with any aquarium, introduce new fish carefully and watch for signs of stress or aggression.
Difficulty Level:
Beginner to Intermediate. They are hardy, but their tiny size calls for a peaceful tank. Aquarists with some basic experience should find it straightforward to keep.
Water Parameters:
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Temperature: 72-79°F (22-26°C)
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pH: 6.0-7.5
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General Hardness (GH): 2-12 dGH
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Carbonate Hardness (KH): 2-8 dKH
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Ammonia: 0 ppm
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Nitrite: 0 ppm
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Nitrate: <20 ppm (regular water changes required)
Additional Information:
- Unlike most corydoras, pygmy corydoras often swim in mid-water schools.
- They are ideal for nano and planted aquariums.
- A soft sand substrate protects their delicate barbels.
The True Pygmy Cory Catfish is a tiny, charming catfish for nano and planted aquariums. With the right setup and care, it will be a rewarding addition for many years.
