if Ich is killing fish that fast, i would say there maybe something wrong within your tank.. either stress or water parameters. 
or it is another disease - brook or velvet can look similar 
velvet can wipe your tank out very fast 
if it is velvet, waiting it out will not work..every fish in your tank will pretty much be dead. 
but if they are already showing excessive signs it is too late to treat anyways. 
sucks ass when you start having such losses 
if you do lose all your fish, make sure you don't put any fish in there for at least 2 months or you could very well go through the exact same thing. 
good luck 
		
	
		
		
		
		
			
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				Way too much time and money has gone into this hobby....and yet, I CAN'T STOP
			 
		
		
		
		
	
		
		
	
	
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