Well I got a Leopard Ctenopoma for Christmas and I put it in my 20gal long. He's all alone in there. I read that they need like 55gals tho, and that is not something I can do. I have a 20gal powerfilter that hangs on the back and a 60gal sponge filter, I also block the current flow so it's not so much. Question is, do you think a 20gal long is enough for him?