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			#11  
			
			
			
			
			
		 
		
		
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			 I used a glass top on my 20long with 3/4 closed and the rest of 1/4 open (at the back for the filters) and I have to do top-offs with few cups of fresh water every 2nd night. 
		
	
		
		
		
		
		
	
		
		
	
	
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