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			 That's a good question.  In my experience my tail spot is perfectly fine with my watchman goby and at one point I also had a lawnmower blenny.  I've always had blennies that minded their own business and none of my fish cared about my blennies.  Of course, your mileage may vary. 
		
	
		
		
		
		
			
		
		
		
		
	
		
		
	
	
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