Looks to big to be ich. Does it look more like a sore or just a flaky scale. Any other symptoms like heavy breathing. The link has a diagnosis section, you can see if anything fits. Good luck
http://reefcentral.com/forums/showthread.php?t=2389659
Just had another thought look into isopods. just tossing it out there.
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Tony
Current Tank Info: 180gal DT, BM NAC77 skimmer,3 Maxspect razors, Maxspect Gyre 150, 30g QT
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