So I'm thinking about a big tank. I'm wondering if having a 30 inch tank height is really gonna be used by my fish? I figure to have Synspilla, Lyonsi, Jack Dempsey, GT, Sajica, and then some bottom dwellers. In my tank now, the cichlids all hang out on the bottom now, and it's 24 inches high. If I had a 30 inch tank, I'd have the top 12 inches of water just empty? The fish only go up there to eat? If that's the case, would I be better off getting a tank that's 24 inches high and 36 inches deep? I guess what I'm asking is what's a better use of tank volume? Width or height?