Hello
I would like to have an identification of these Corydoras as well as a sexing.
They measure about 6 cm and are at least 7 years old.
What do you think ?
Not sure. Sometimes the finnage, if slightly torn or edge is frayed, can be ambiguous. The body girth says male, but the fins aren't clearly pointed as they are in the other two fish.
I took the 3 in photo (I had a doubt about the individual asking question). I have observed them and the pelvics seem to be pointed. Seen from below, they also look identical.
I have already had breeding Corydoras aeneus in the same tank but they never reacted. Maybe this is also a sign that there is no female of their species?