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There are a ton of designs for sumps. What you have will work fine. If your DT has a dual overflow it’s not a bad design. Unless you are running an external skimmer not all of your water is going to get skimmed. Another common design is to have the bleed off the return feed the fuge. I doubt there is any real evidence to show one design is better then another. Another common design is to have a manifold feed by the return pump feed an ATS and comes after the skimmer. Those seem to work fine.
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