I would just buy some chaeto from a local member and shake it out over your tank.  If it's been established for a while you'll prob get all sorts of goodies from it. 
 
If you can find a member that isn't a skin flint then you may get some for free. 
 
Dunc 
		
	
		
		
		
		
		
	
		
		
	
	
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