Hello,
My personal opinion is to have water flow from one end of the sump to the other end. In other words, all overflow lines are drained into the same side of the sump. This usually maximizes the useable refugium space without the need of pumping water into a separate refugium section; and also minimizes the water flow per square inch of space, which helps to reduce bubbles from flowing into the draw chamber.
There are many fancy designs out there but the KISS rule is the best in my opinion.
Titus
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