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 same here ive had a few and have a small one now and ive never had any break glass but still i would be skeptacle about really thin glass, it would depend on the mantis mostly and its size.....at 2" youd be fine ![]() ![]() 
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			 I think a mantis cracking the glass would be more by accident, probably catching prey along the glass. It would need a reason to attack a pane of glass in the first place, but I guess better safe than sorry. I've seen a 3-4" peacock mantis in a 10g stock tank without issues. 
		
	
		
		
		
		
		
	
		
		
	
	
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			 Something like a Oceanic Biocube or even a Fluval Edge would make a cool Mantis tank.  Both are relatively inexpensive too. 
		
	
		
		
		
		
			
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	32"x32"x20" Cube-ish tank  |