One of the drawbacks I see to an auto waterchanger is that you don't get to siphon out detritus.  I find this implemental in the health of my reef, but I do have lower flow because of my LPS so maybe you guys with high flow SPS tanks don't get detritus settling anywhere? 
		
	
		
		
		
		
			
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				~ Mindy 
 
SPS fanatic. 
			 
		
		
		
		
	
		
		
	
	
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