I currently have a galaxy wood cat (I cant remember the exact species) living in a pvc pipe in my 55 gallon aquarium. It only comes out at night to feed on sinking pellets. It is extremely skiddish, and only comes out after all my barbs and giant danios have gone beddie byes. I think it doesnt like competing with them for food. I also have a 5 galllon aquarium upstairs that is starting too get to small for all the plants in it, and that I want to upgrade to a 10 gallon. It currently houses a pea puffer, a scarlet badis, a couple of cherry shrimp (being moved when the puffer is big enough to hurt them) and a my last guppy (he's a tough old bastard, trust me). My question is, would a five inch catfish who does nothing but hide all day be happier in an ten gallon aquarium where nothing is gonna get in its face? or is it just too small?