Is it a new set up?Do you have corals?.......If its new and there is no corals in it right now just turn off all lights(MH,actinics,moon,etc.) for about 5-7 days...Im in the process of doing that right now and my hair is going away....but my set up is new with no corals.........also I have a small clean up crew of a few snails and lawnmower blenny........
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