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No need for the external box IMO. If the piping is large enough you can have it drain directly down, or build an external durso (have a tee behind the tank, one end goes up with a cap and a hole drilled in it, and the other end down to drain to the sump. I would also cut the PVC down the top, not the front side. Also, why to the returns in the corners go so far below the surface?
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One day I'll be so rich I'll have a closed loop and Tunzes to mix my new saltwater!
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