How many bulkhead fittings do you hve in your overflow? If you have 2, with one being the return to the tank like in the Oceanic tanks you can convert the return to another outlet from the tank. Put a short standpipe and a ball valve on this line to adjust the flow so water just trickles into your larger durso. No bubbles, and totally silent. Your return from your sump is just plumbed with PVC to a back corner of your tank.
Rob
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