There is always a more natural way of controlling nutrients using an ATS or chaeto in the sump. 
 
Tim Tessier (on Canreef) sells Fozdown which is lanthanum chloride.  He is a strong advocate of its use. 
 
I have used each and every method I have mentioned above.  I do not like adding chemicals or using GFO and I couldn't grow chaeto to save my life.  My ATS works like a charm.  I had to reduce the hours I run it to reduce the amount of nutrients it is removing from my tank. 
		
	
		
		
		
		
		
	
		
		
	
	
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