I saw some Pacu related freshwater fish that clearly liked to pet; returning again and again for the gentle caress of the pet shop employee. She said certain fish even had favorites: one fish would only let the owner pet it, while another let anybody pet it.
Ok, so the question is, excluding Piranha and Lionfish as obvious untouchables, what commonly available home tropical freshwater or marine fish (not in public aquariums) have you pet or seen petted or know about being petted?

Ok, so the question is, excluding Piranha and Lionfish as obvious untouchables, what commonly available home tropical freshwater or marine fish (not in public aquariums) have you pet or seen petted or know about being petted?