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Corydoras belong to the freshwater actinopterygian siluriformes genus. Other varieties of fish have evolved a lot, but Corydoras not so much, they are fish originating from the Paleocene era, being very resistant and good at adapting to waters with little oxygen. They adapt very well to community aquariums, since they occupy the lower part, where they do not compete for space with other species. In the aquarium they perform an important maintenance and cleaning function, since they consume food remains that settle on the bottom and although one of their terms of reference is "aquarium bottom cleaner" or "trash fish" it should be clarified that this specimen does not consume excrement from other fish. I would emphasize that if you intend to have Corydoras in your aquarium, they are gregarious fish that need a small school of at least 5 to 6 specimens, so that they are active and do not contract any disease. This species of fish has a flattened ventral part and a convex dorsal part. The body and head are compressed and the eyes are positioned more or less above. They have a small adipose fin that is located behind the dorsal fin and is characteristic of the Callichthyidae family. The pectoral fins formed by a large spine are important for their reproduction. They do not have scales, instead they have two rows of bony plates along the body that overlap covering the sides, back and head. In fact, their name “Corydoras” comes from the Greek words Kóry (helmet) and doras (skin). Another characteristic detail is the pair of beards or whiskers located on the lower jaw with great sensory capacity to help them search for food at the bottom of rivers and lakes. Their mouth is located downwards to be able to eat food from the sand.