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 do a search here on canreef, there are plenty of posts dealing with hair algae.  but the basics to start with are: water (should be using r/o water), lights (age of bulbs), over feeding 
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 120g w/starphire front, pm bullet 2 skimmer, yellow tang,  emperor angel, niger trigger, spotted hawkfish, blue tang, flame angel and 120lbs lr
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