I have had Green Water a few times and it only happens to my tank when I do not dechlorinate the clean water prior to adding it to the tank. I have also had BGA on different surfaces in the tank, but never as a bloom free in the water. I have read many methods of resolve, but the one that worked the most efficiently was adding a bit more KNO3 after some physical removal. Because my tap water is high in PO4, and NO3, NO4 tests registered a big fat 0, this seemed to be a good theory, and it worked like a charm. Steve ------------------ To unsubscribe from this list, please send mail to majordomo@thekrib.com with "Unsubscribe aga-member" in the body of the message. Archives of this list can be found at http://lists.thekrib.com/aga-member/