In my system, pH is 7.5 to 7.8 after the carbon block and I use 72-75F water.  I just use a 1 micron carbon block, and it handles all the chloramine and chlorine.  I'm going to test ammonia after my RO membrane now - I'm curious how much is getting to my DI resin. 
 
Also of note, NH4 generally isn't toxic to fish, but NH3 is lethal. 
		
	
		
		
		
		
			
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				~ Mindy 
 
SPS fanatic. 
			 
		
		
		
		
	
		
		
	
	
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