I have been fighting with red cyano for more than a year and after using crabs, protein skimmer, etc. I got fed up last week and ripped out my protein skimmer from my sump and replaced it with a large wad of Chaeto, some turtle grass and gracilaria in my sump/fuge. In ONE WEEK my cyano is completely gone! I mean nothing left of it, even behind the rocks, etc. where I can't reach it to siphon. I didn't use any chemicals, it just disappeared on it's own over the course of several days. Also the turf algae that the cyano was resting on is disappearing as well. My coralline is now taking backing the areas the cyano and turf had previously laid claim to.