I've gone with a 14hr. RDP light cycle over my refugium and it hasn't gone sexual... it's going on 7 months. I think that's good enough and I get decent caulerpa growth. 
 
I noticed that this method decreased the daily pH swing by .1 Now with my reactor and dosing kalk at night I get pretty much 8.3 all the time using my Pinpoint. 
		
	
		
		
		
		
		
	
		
		
	
	
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