If it was my tank, I would pull all the fish and treat.  
  
If that is what you are going to do then I would set up more then 1 quarantine tank, maybe even 3 or 4 to spread out the fish load. 
  
I have an empty hagen 48 (48x12x20)  It just needs some cleaning if you want to borrow it. 
		
	
		
		
		
		
			
		
		
		
		
	
		
		
	
	
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