Did you know fantastic help is an anagram of Planet Catfish? This forum is for those of you with pictures of your catfish who are looking for help identifying them. There are many here to help and a firm ID is the first step towards keeping your catfish in the best conditions.
@Chrisyhthys
Thank you for the first information, but my catfish are between, the smaller one 17 cm the greater one is about 22 cm.
I think this is too much for S. robbiana.
In fact of this, I think it`s S. nigrita or posssibly S.eupterus