I’m setting up a new tank (standard 6 foot, 180g) …It’s going to be a Freshwater for a few years, then I’d like to step up to Marine…(or at least till I can afford the 700lb+ of LR and a decent skimmer). < That's a lot of LR! And a decent skimmer can be had for under $200. That said, there are also reef tanks that don't require as much LR, you might want to check out Aquarium Fish Magazine, August 2002, "A Guide to Reef Tank Designs & Setups" by Charles Delbeek and Anthony's Book of Coral Propagation V1 for some alternative reef tank ideas. I'd recommend getting Anthony's book if you're planning on a reef tank. Lots of good stuff in there about design, water chemistry, husbandry, etc.> The tank has been drilled with 2, one and a quarter inch holes….now I was wondering if it would be feasible to set this system up like a marine job I.E. drop gravity to a 3 or 4 foot sump (containing the heaters) and passing it back via a pump to a manifold with
