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					Originally Posted by  jorjef
					 
				 
				No disadvantage, it's more for prevention not a cure. There won't be any harm to put it on now just don't expect great results for a cure. 
			
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 I also wouldn't run one full time in a reef, as I feel that there's a lot of microscopic food floating round for corals. Other than that, no real disadvantage, just at this point, it's too little too late..