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I would do something along the lines of the below image. Place the refugium on one end, with a tall baffle. That will increase the volume of the fuge. Tee off the return pump with a valve to control the flow into the fuge.
I would also design the set up to not need check valves. When there is a power outage, you want to minimize the amount of water that will drain back into the sump from the DT (overflow box, return piping, etc). Also the sump should have enough free space to hold all the water that drains down during a power outage.
Thanks for the sump idea! Based mine off of your diagram [emoji41][emoji106]