he needs cool fast flowing water and high oxygen levels. there not active, love to sit in fast powerful flowing water.
in the wild they sit in the flow and catch passing pray.
awsome cats ive had a couple. the largest one i had was 12 or 14" and it was stunning. they are really relaxed calm fish. i was able to pick him up and move him out of the way, stroke him and never needed to net him should i wish to remove him from the tank.
ide have one now as i know were thereis 2 about 4" but i only have high temp tanks so it isnt fare on the cat if i put it in there.