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					Originally Posted by  mark
					 
				 
				but why? I'm adding calcium chloride and sodium bicarbonate, not seeing phosphates in the recipe. 
			
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 Well, if you want to be picky,... you can dose Foz Down (I have used it, too) to reduce phosphates, which helps SPS growth...
My point was really that how you dose Alk and Ca are not the only things that are important about good SPS health. And the OP did mention that he had an SPS dominant tank.