it depends how you build. If you have acrylic euro-bracing at the bottom and the top of the tank, I would go up to 36. Otherwise 30 is probably safe. 
		
	
		
		
		
		
			
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If people don't die, it wouldn't make living important. 
And why do we fall? So we can learn to pick ourselves up.
			 
		
		
		
		
	
		
		
	
	
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