I did have one 36" long in my tank , got rid of it few monh ago. 
It ate everything ! small fish all types of corals LPS, softies, mushrooms rics you name it . 
Very nasty thing. I think this is the worst hitch hiker in aquarium you can get. 
Much worse then mantis shrimp. imo. 
		
	
		
		
		
		
		
	
		
		
	
	
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