I have this really nice frag tank but am really dreading the added work of another separate setup. So my goal is as low of maintenance as possible. so, if you were setting up a 20"x20"x12" frag tank... How big of a sump would you use? Would you add fish or keep it just frags for lower nutrients? Would you bother with a skimmer? Obviously yes if adding fish. What would you use for lights? I thought t5 but even the smallest fixture would overhang the tank on each side and the actual usable area for frags is roughly 13" x 18"