Watch out for ozone though because unlike UV sterilizers, ozone can get into your tank & kill off your fish (this has happened to another Canreefer). UV works best as a preventative or at the start of an outbreak of ick IME.  If the ick is already really bad, then the fish is usually a lost cause unfortunately. 
 
Anthony 
		
	
		
		
		
		
		
	
		
		
	
	
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