I would wait for some expert advice. I am going with what I've read and not personal experience. I built my sump with three chambers. Overflow and skimmer, return area, and refugium. I used duel returns with limited flow to refugium area. I also went with a reverse light cycle on the refugium area. I did not notice any pH stabilization with that for the night time like I had hoped. My Chaeto has disappeared into nothingness over the last few months. I don't know why. I had a nice PC light directly over the Chaeto ball.
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