i fought it for six months before i finally broke down and used a product called chemi clean. i have a full reef tank and was very concerned, but it worked great, got rid of it totally in two days, has never been back since, it also really clears up your water. i use it now about every two months just to clarify the water. it did not harm anything and worked great i highly recommend it. PS i tried everything and i mean everything this is the only thing that worked.
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