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Unread 05/08/2019, 10:24 AM   #6
silentstorm
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Join Date: Aug 2013
Posts: 96
Well, external overflow means more room inside the tank in other words. The other thing I can think of is the holes drilled for the overflow are on the back wall of the tank, higher up and not on the bottom glass. If the bullkhead / plumbing were to fail, you're not risking all the water out!


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