This red Algae brushes right off with a tooth brush and it's only on a few pcs of my live rocks. Anyway, so far I have cut back on my feeding, Doing weekly 10-gallon water changes instead of 20 gallons every other week. Running ROWAPHOS & Carbon ROX by BRS in my Dual Reactor and keeping a close eye on my parameters. Does anybody, have any other recommendations?? Here are a few pics of what this stuff looks like!