The disease theory, either with or without an opportunistic something-or-other that pulls the fish into the rock, is entirely plausible... I just thought it was odd the fish were pulled tail first into the rock but that's not saying that it means anything. I've never knowingly had a mantis in a tank so I defer to those who have them (or have had them) to know better than I, what makes sense in that case. 
		
	
		
		
		
		
			
				__________________ 
				 -- Tony 
 My next hobby will be flooding my basement while repeatedly banging my head against a brick wall and tearing up $100 bills.  Whee! 
 
			 
		
		
		
		
	
		
		
	
	
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