There are antibiotic based treatments available at most LFSs, such as ChemiClean that will remove it, but you really want to get to the root cause of why it's there in the first place, or it will likely come back. How are your water parameters? Particularly nitrate and phosphate. How is your flow? Are the affected areas getting plenty? Cyano is photosynthetic, so if you don't have any coral to worry about, you can turn your lights off for a few days.
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