It will be drilled at some point, just no time soon. Layout and space considerations are the reason for the overflow boxes. Someday this tank would make a nice sump for a bbbbiiiiggg tank, but for that to happen the kids would have to move to the barn, the wife says that isn't going to happen!
Most of the system has come together in my head, the only unknown is the overflow boxes. I've never seen them used, or heard much about them for that matter. That has me thinking there is reason why they aren't more common.
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