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			 I am new to sw, and I just found out that I should test for calcium and kh.  The calcium is 400(which I believe is ok) but the KH was 15, which I think is high.  How do I lower this?...or is it not a problem.  I don't add anything to the tank and it has been running for 3 months 
		
	
		
		
		
		
		
	
		
		
	
	
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