eh.  hermits are overrated anyways.  Wrasses, especially the larger species, are carnivores after all; this sort of thing happens.  I'm sure there's a size refugium for hermits and other arthropods relative to the size of the wrasse but what that is, I have no idea.  Do you have a role that absolutely needs to be filled by hermit crabs?  if not, then don't worry about it. 
		
	
		
		
		
		
		
	
		
		
	
	
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