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.
The problem with Ancistrus species is not only there are many different species with similar colouration, they are usually exported as a mix of wild cought "Ancistrus" and in most cases impossible to know the true origin.
Ask your LFS if they have any information to share and maybe we can come up with something.