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 Yeah, keeping it within the ranges is good.  The problem is when Calcium is overly higher than NSW as what I assumed Steve meant.  I don't mean 420-450 range but more like something over 500.  In that case, Alk would be overly low.  Thus slowing coral growth I assume. 
			
			
			
			
			
			
			
			
			
				
			
			
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