I would agree that pointing the finger at ich is premature at this point.  I have never used a QT and I do get ich every few months (usually a sign that I'm behind on my water changes or I've added a new fish.  My cleaner shrimp help 
with the ich until the fish can fight off the ich themselves.  I can't say that I have ever lost a fish to ich and I have 4 ich magnets in my tank, blue tang, purple tang, yellow tang and powder blue tang.  All 4 of them enjoy sharing the ich wealth with their tank mates from time to time. 
 
I would investigate other potential causes. 
		
	
		
		
		
		
			
		
		
		
		
	
		
		
	
	
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