+1 on the chemiclean.  i just used it less than a month ago and my tank is still cyano free.  first time in 9 months or more.  I have a 75g display with a 20g sump.  i underdosed the tank to be on the safe side and dosed for 60g of water volume.  some of the corals didnt like it but after 3-4 days, everything was back to normal (following WC and skimmer instructions of course).  its a great product! 
		
	
		
		
		
		
			
		
		
		
		
	
		
		
	
	
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