I had that and tho only thing that worked was chemi clean, didnt harm anythign else at all worked great. I have hear on a long post on reefcentral, that cyano is actualy cyanobacteria, and it is not an algae ut a bacteria, and thats why other animals wont touch it , because it is bad for them, i might be wrong but thats what i've read numerous times. also wei's has chemi clean.
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