So one of my 8x3x3 I have my JD, Electric blue texas and GT who are all somehow best friends, maybe the large footprint helps.. along with a 7 year old scobina ray. Looking to get a cat that should scoop up left over food from the bottom. That big enough for the ray not to go after..he's been with many cat and bottom dwellers and never attacked a soul but I always like to sit on the side of caution. Any cats come to mind? Maybe some that I can get as a group or one just larger cat? Not too knowledgeable on all the catfish so just looking for suggestions