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Thanks for the clarification. I was told that it was algae. Now that I know its bacteria do you have any ideas what i should do. Bristopher

Its back, actually it never went away. I have tried chemi-clean...did not clear very much up. I have cut my lights down to being on for 9-10 hours instead of 12. LAst water test DINHOUSE did was good. The cyano is growing on sandbed, back of glass near the heater and on some rocks even saw some...