i think the capn suggested it because all else had failed ronny, but he also suggested the source of the cyano is identified and dealt with so it doesnt come back, i understand your frustaration buddy, is there any way you can get a reactor on the tank, just drop a maxi-jet 400 in the tank about 6" from the sand and hang a two little fishes on the tank, fill it 1 third with rowaphos and run for 5 days, then dump it and re-fill again, for 5 days, and then see how the cyano is, just another suggestion, i think max is right ronny, but really hope you beat this thing.