I'd like to thank everyone for the replies. I had looked through the PC gallery before posting but only checked the Tatia and Centromochlus species. I'm lucky enough to bump into Lee Finley every few months, so now that I know what species they are, I can ask him about his experiences with this fish ...

Does anyone recognize these fish? I bought them in August at 1 1/2" long as Liosomadoras oncinus - Jaguar catfish. They are now approximately 2"TL. Somehow I don't think it was an accurate ID. TIA!