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			#18  
			
			
			
			
			
		 
		
		
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			 YOu are better with the Kh not more than 10 as this can bring a lot of RTN STN in your coral.  Too high Kh is a risk for this condition. 
		
	
		
		
		
		
			Natural sea water is between 6.5 to 7.5, no 11 or 12. It is also best to maintain a mid range value for the Kh because if your test is off a bit, it won't be so drastic. If you keep it at 12 and your test is off you might reach 14 or more....even 11 is incresing the risk of RTN. Quote: 
	
 
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