I have to agree, I've had Oranda's as hand trained as Oscars. both dumb fish imo. cuttlefish and octopus are both excedingly intelligent. I would have to say some of the knifes, elephant nose, eel type fish imo and experaince are the most intelligent fish in the home FW aquarium. catfish being at the tail end of that, for some reason they just seem to do smart things...