My only reef is a nano. it's a 15 gal high, which is the same footprint as a 10 gal, but 6" taller. I have enough room for 6" o' soutdown- amazingly enough, one 50 lb bag=6" in my tank! and still have the display area of a 10 gal. for lights I went with two 32w pc, 10k and actinic. with weekly water changes, My skimmer never pulls out any gunk, but it is a nice place to keep my heater and my ph probe.
HTH
b