Mine's approx. 2" from the edge. You don't want to be too close to the edge as you will "jepordize the structural integrity" of the glass.Whooa...that sounds too technical...I bumped my head just now crawling under the tank and I'm a liitle stupid...
I agree with Lee, I'd go with the 12" diaganal. I find my 6x6 corner rather intrusive. My 60g corner tank is set up with a diaganol overflow and it looks way better and it's easier to conceal...aaa,the excitement builds eh?
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