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					Originally Posted by  KrazyKuch
					 
				 
				I would drain your ato and cut that piece out and put in a new one....then you would know its good and not break and dump water all over your floor 
			
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 The ato is just separated from the sump by an internal baffle.  The back glass is one solid piece and I wouldn't be able to cut it out.
http://www.canreef.com/vbulletin/att...0&d=1327595066
There's a pic of the sump on page 3 of my 180 gl build thread, but attached a pic I drew when setting up.