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Ok, since mine is similar, and he's finished, i am doing a sump, unfortunately not acrylic. And was going to do a ~5% change twice a week, by putting a bulkhead with valve @ 2" higher than the pump bulkhead, and have a float valve for top off at 12" higher than bottom of that bulkhead making it exactly 10 gallons.
Then in rubbermaid mixing container next to it, refill it once it drains.
Is what you're saying above saying this way is not workable?
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