Could we get some more info on what you are trying to accomplish? FOWLEAR,Reef tank,SPS Dominant or softs corals,cold water, ect. You say you have your light picked out? What are you aiming to keep? Is the tank drilled form the bottom or side? Is the bulk head already in place? I might also look into sump designs as there are many different kinds and ll of them work just some better for certain specifics.