Ive used flatworm exit a few times on tanks ive had if you follow the directions it works good and ive had zero issues with fish or coral stress 
		
	
		
		
		
		
			
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				Current tank---125 gallon mixed reef 60 gallon sump, Reef octopus nw200 skimmer, Rapid LEDs, Maxspec gyre, Mp10s, Fuge, Biweekly 20% WC,  QT everything
			 
		
		
		
		
	
		
		
	
	
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