Sorry to hear this. Copper would have been the best method of killing Marine Velvet. Always keep a hospital tank nearby for cases like this. You could have taken all the infect fish out and medicated them. Copper is the only way to eradicate velvet.  
 
I know personally how it is to lose most of your fish to velvet. And know personally how to eliminate it from a fish. QT/HT and Copper are you last line of defense against ailments such as this. 
 
Take a deep berath. Its ok. If need to cry, do so. It is really really tough! 
		
	
		
		
		
		
			
		
		
		
		
	
		
		
	
	
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