I am running brs biopellets in a RO reactor and at the advise of others have stopped using gfo about two weeks before the addition of biopellets. The biopellets have been in action for about 7-8 weeks no noticable improvements in either nitrate or P04. 15-20 on nitrate .35 on P04. I feed pretty heavy have an auto feeder drop a small portion of spectrum pellets two times a day and feed arctipods or a frozen food when I get home 6 nights a week. 3 times a week I feed the corals some oyster feast.