Considering getting a new saltwater system when I move. I currently have a 75g glass FOWLR. I would like to go bigger obviously and wanted to see if it was a good idea to use my 75g as the sump of a brand new system. My LFS will build. What display tank size do you think I can go with by using a 75g sump? Any aproximate cost or such a system? I live in NYC so expect quite a large upcharge on everything here anyways.