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#1
03-06-2008, 09:36 PM
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I think the best use of the lower hole would be for a closed loop. If you wanted to go that way. It could draw water through a pump then returned with plumbing over the top of the tank.
I would not recommend using it as a return. Power goes out and you'd have 120G on the floor. I'm no expert in overflow design, typically I've always built a box. Untamed is the Herbie expert. J 
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#2
03-06-2008, 10:30 PM
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Don't use the lower hole for the drain even with a check-valve, unless you say have a 90 then extending upward to some form of overflow. The overflow does not need to be a box going all the way down but could be a coast to coast style tying into the bulkhead or could also consider just a piece of horizontal PVC (pictures here).
Upper hole for return. Last edited by mark; 03-07-2008 at 12:40 AM. Reason: wording
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