Chemiclean it, get rid of it, forget the last resort crap cuz your gonna end up doing it so just do it now and stop over battling the cyano that's going to fight with you for a long time. Everybody wants to go the natural route, but face it, there is nothing natural about trying to keep an ocean in a small glass tank. Keep working on your water quality and enjoy your tank and stop fighting the cyano fight.
Don't worry what the reef police think, they are telling you not to use any "chemical bandage fixes" while they are popping pills, chemicals and putting bandages on everything that ails them. Even the best maintained highest quality tanks get cyano, it's present in every system and sometimes gets out of control and nobody knows exactly why or how.
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Well said.