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.
I got a mammoth female and now just picked up a male for her but was told they are not of the common Bristlenose. If anyone can point me in the right direction in ID'ing them it would be greatly appreciated.
Female is about 6" and male is a little about 5"
Female in front of a 2qt. floating nursery in a 180g tank for size reference
The listed size is standard length, i.e. the length from tip of the snout to the base of the tail. Based on your picture I'd say your female has a SL of about 4.5".
Common BN are sold in huge numbers. Many are bred, but still loads are wildcaught. Over here basically any BN that is brown with lighter spots will be sold as "common BN". At my LFS batches of wildcaught common BN always contain several species. Only very few people would be willig to pay a lot for a fish that looks like one that you can get for next to nothing everywhere: Ancistrus sp`colombia` Ancistrus multispinis So no-one bothers with an ID for these fish. That is why many Ancistrus species are not commercially available. Unless you buy from a very dedicated (cat)fish shop you will not be able to get information on capture location which would be needed to have a chance to get a more accurate ID.
So I am sorry but I do not think that you will get any further than "Ancistrus".
Am I the only one who get some striped Panaquolus-looking fish when hovering over the clog-tag Ancistrus multispinis, rather than a photo of the species A. multispinis? Is it just me, or an odd error in the cat-elog?
As for this thread... OP's fish don't look like Commons to me, but I can't say what species they are (or even if they're the same species!), and I agree with Sunfish that they're probably impossible to identify without knowing where they were caught.
-- Disclaimer: All I write is strictly my personal and frequently uninformed opinion, I do not speak for the Swedish Museum of Natural History or FishBase! --