That must be what it is!  The button and window cutout line up but there's about 1/2" of empty space at the bottom.  When I ordered it I just thought the case would be the exact size and when I saw the space at the bottom it surprised me.  I'm a dummy, even with the "finger space" I just grabbed my tank and pulled it out from the top. 
	
		
			
		
		
	
			
			
				
		