Wouldn't the salt solution freeze as a salt solution.  I think that when water freezes, everything mixed in the water freezes with it.  Sort of like kool-aid.  When you freeze it, the ice is not just water.   
 
Simon 
		
	
		
		
		
		
			
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				New Tank! Some LR, lots LS, some fish, big pump, fat skimmer, bright lights, and salty water!:0
			 
		
		
		
		
	
		
		
	
	
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