Precisely.  This whole question came up when I decided that I want water flow through the bottom portion of the tank (and  have a pump but not a powerhead).  As it is now, my 33 will take the drainage if a  failure should happen, but 90 gal of water rarely fits in a 33.   I like the idea of the hole drilled just below the surface... not sure how I didn't think of that as that is how I have my other return line set up... but that should solve my problem... thanks all!!! 
		
	
		
		
		
		
			
		
		
		
		
	
		
		
	
	
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