Ya Bluetang I agree,  When mixing for a new tank I have always done it right in the tank, but have ensure the water temp is stable and added salt slowly.  You should let the salt mix for 10-15min before taking a reading.  I don't think you were that far off to do any damage to your LR as most Reefers keep their SG around 1.026. 
 
As for water conditioner again I would purchase a tap water filter and us it. 
 
 
J 
		
	
		
		
		
		
			
		
		
		
		
	
		
		
	
	
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