I use vinagar and a syringe to kill it off.  I have / had some pretty huge ones ( the size of toonies ) that took a couple of doses to kill. 
  
I had a file fish as well, great little fish but he didn't touch aptasia.  Sadly he got taken out by my closed loop intake. 
		
	
		
		
		
		
			
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				Robb
			 
		
		
		
		
	
		
		
	
	
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