Years ago I had a really horrible outbreak and used the product that other people in this thread refered to as Chemiclean. It worked great! Noticed an immediate improvement and I have never had the problem again. I bought mine at J and L aquatics, but your LFS may carry it. About 20 bucks, and you don't need much, depending on the size of the tank. Didn't hurt anything in the tank except the cyano. 
		
	
		
		
		
		
			
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				I currently have a 45 gal. reef tank with 2 clowns, sixline wrass, yellow tang, 3 yellow tail damsals and a royal gramma.  
Also have a 90 gal. fish only with 2 clowns, sailfin tank, strawberry basslet, 3 yellow tail damsals, bi color angel and coral beauty angle.
			 
		
		
		
		
	
		
		
	
	
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