Like Ich, your tank needs to remain fallow for several weeks in order for the velvet to be out of there.  Honestly though, when people buy corals from a LFS or someone elses' tanks there is often Ich, velvet, Brook, etc in the tanks so buying from your tank really isn't any riskier than buying from an LFS. 
		
	
		
		
		
		
			
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				~ Mindy 
 
SPS fanatic. 
			 
		
		
		
		
	
		
		
	
	
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