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			 mine do that all the time. i got 30-20 hermits. i dont know why they fight like that but its normal. if the smaller of the two win he gets the bigger shell. but if u have a lot of empty shells they should be okay. 
		
	
		
		
		
		
		
	
		
		
	
	
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			#2  
			
			
			
			
			
		 
		
		
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			 Blue Knuckles get decently sized and will mangle other hermits sometimes. I personally had one that was well behaved for 6 months+ and then slayed my Staghorn hermit and died the next day (poisonous maybe? karma?) but I know someone else with one that kills any other hermits on sight. 
		
	
		
		
		
		
		
	
		
		
	
	
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