Looking to get a new cube and upgrade from my 34 Solana SPS tank. Want to go the shallow reef route. Tank has to be 30x30 cube due to the position in the room. My question is what depth.....18 or 20? I know Marinland has a stock 70 gallon cube that's 30x30x18 but it has pretty thick trim which probably makes it look even smaller. Otherwise I would have to go custom( any companies in NJ ?) Lighting will be an ATI 24" Powermodule 6 T5 suspended from the ceiling (already in place from previous tank). 90% SPS in the tank. At 18" I think I might be burning corals unless I raise the lamp really high.