I have a frag tank.  It isn't 100% yet but I don't like cutting things while people are waiting.  I find I damage the corals trying to get a good piece. 
With a prop tank.  I'm able to tank my time and get pieces that may not be the greatest but a month in the frag tank the growth and colour have improved the piece to the point that it is justs as good if not better than any piece I could cut off the colony 
 
J 
		
	
		
		
		
		
			
		
		
		
		
	
		
		
	
	
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