Where are the rest of your parameters at?   
 
Phosphates 
Nitrates 
Alk 
Calc 
etc.. 
 
If your SPS were used to nice clean water with a TDS of 0 but are now being exposed to non zero TDS water they could definitely be disgruntled enough to pack it in and call it quits. 
		
	
		
		
		
		
			
		
		
		
		
	
		
		
	
	
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