When I had "rogue" anemones, I would corral them in a corner with some smaller pieces of LR. 
They would eventually get the idea. 
Then I would move them to a more ideal place. 
If it let go again, I would just repeat and choose a different "ideal" spot. 
 
Mitch 
		
	
		
		
		
		
		
	
		
		
	
	
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