This species of Corydoras has always seemed one of the most attractive to me; clear white with fine black dots. Not strange it has the popular name 'Fairy cory'. Corydoras atropersonatus is found in Equador and northern Peru (Rio Nanay, Rio Tigre and Rio Canambo amongst others). These fish grow to around 5 cm. and they vary quite a bit when it somes to the number and size of the black spots.