Do a search for cyano - must be many posts.
Cyano feeds off of phosphates and taking measures to control phosphates will go along way to eliminating your problem. Std. measure to control phosphates are to minimize the import and maximize the export.
Std sources for phosphate are tap water & certain fish foods (flake food being high on the list). If your using tap water switch to RO - if your using flake food make sure it is phosphate free or switch to frozen or something that has less phophates. Std measure for export are water changes (with phosphate free water) and regular syphoning out the cyano which has acted like a
phosphate sponge.
Cleaning your filters on a daily basis until this outbreak is over may also help. Setting up a refugium with
macro algae will also help. Some people will use a phosphate sponge.
Hope this helps. Good luck.
