Corydoras pygmaeus is the smallest dwarf cory around. they are shrimp safe.
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Pygmy Corys or Corydora Pygmaeus are the smallest Cory catfish in the aquarium hobby only reaching about 1.3 inches when fully grown. They are very popular in shrimp tanks because they are smaller than many of the shrimp and are considered peaceful and safe to keep with them.
Pygmy Corys do best in heavily planted tanks and with groups or shoals of their own kind. It is considered almost necessary to keep at least 6 of them together and preferable to have 10 or more. They can also be kept with other non-aggressive fish. They prefer temperatures of 72-79 degrees Fahrenheit and a PH of 6.4-7.4. They are not picky and will consume most omnivorous foods, but care should be taken to make sure the food is small enough for their tiny mouths. When feeding them live foods they enjoy small creatures such as Daphnia. They are sexed the same way as other Corydoras by looking from above. From above the female will have a thicker body and may be larger in general than the male. Pygmy Corys can be bred in freshwater.
Like other bottom dwellers, clean water and substrate are essential to Pygmy Corys health. They are sensitive to dirty water conditions and dirty substrate can cause issues with their barbells. When kept in clean conditions they are easy fish to maintain. Pygmy Corys make a tiny entertaining addition to your aquarium.