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Red sea coral proWhat are you using to test phosphates? Cyano can grow in very little phosphate environments so a very low range test is necessary. Also, what is your temperatures running? I have noticed even the cleanest of tanks developing cyano when the temp gets much above 80* F.
I have done that before i guess I'll go back to itI've had this issue and some of you may know. From the good advice I received, my cyano is now gone. Cut back my light schedule, checked my ro/di water tds, cut back feeding, chunky water change/siphon cyano out. Flow was already good so I know that wasn't the issue. Voila, no more cyano.