I have been having the same issue for months it seems now. I have ran the UV constantly for weeks and no change. I doubled water flow through the unit with now change. I let my No3/Po4 levels fall down way low and also had them very high. I am not sure about this one either. Next thing I am going to try is less iron fertilizing. One note is that when doing the excel overdoses a while back it seemed much better, but it came back after the overdoses stopped. I would like some good answers for this one also. |