Corydoras nanus is practically compressed corydoras, their features are a lot more toned down and they have this adorable, stubby took to them. This fish can be easily recognized by their rounded snout, round body, and primarily the contrasting black and white colour they sport. Nanus corydoras have a white body colour with an abundance of black striping and spots which travels from head to tail, they are also present on the dorsal fin. In some cases, the fins can show a yellow tinge but this may only come out in more mature individuals. The cheeks of the nanus corydoras also have a light jade green sheen which seems to be a common factor amongst nearly all corydoras.
