some things that work for red cyano have lessoned this but it is pretty stubborn. Like high current, only r/o water now & clean up crew,poly marine pad. I also use I-Bionic and all my test results are very good. Still cannot get hold of a conch. When I change water I can scrub some off with a heavy brush. I have tried to seed with two nice purple encrusted Fuji live rock. Any ideas on what this is and how to get rid of it?