I wanted to get info on upgrading 55 gal. to biggest tank I could fit in this spot. 48" 24" wide 30? h or 24-28.I don't have a basement so thinking of custom stand to fit largest sump under it possible folr tank but it feels like I,m stepping back. I thought it would be nice to get some fish you cant put in with coralshow many fish could I put in a tank this size?