I had that crap in one of my old tanks and it was hell.  I'm sorry I don't have any fixes to offer you  I ended up tearing the system down and restarting cause I just couldn't get rid of it.  I agree with Christy to find someone to keep your corals and let the tank lie fallow until they go away and then it stay that way for a while and add everything back in very slowly and be prepared to do it again if it comes back.  Sorry.  Also I don't know if this would help but I had some of that nasty red cotton candy algea in my sump/fuge.  It never did get into my display but I did manage to get rid of it by adding a few very large Pacific Turbo snails and a sea slug.  Don't know if it would work on this though. 
		
	
		
		
		
		
		
	
		
		
	
	
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