I've seen lots of great setups without them. IMO, they are more harmfull than beneficial. I was going to buy one myself at one point, but my research on the matter dissueded me. If you are just getting started, I would recommend priority on a good skimmer, lighting, and circulation above all else. Rich.
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90gal Starfire mixed reef, 400W MH (Giesemann 13K megachrome/Icecap E-ballast), (2) 54W T5 Giesemann true actinic, 45gal sump (65W 50/50 PC), ASM G-3 Skimmer, Mak 4 return, Sequence Dart closed loop, foam backdrop, 120 lbs LR, 2" sandbed, & 1 dillhole running the show.
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