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I can comment here (am close friends with Steve, and have seen this display):
The water for the refugium does indeed spill over a shared wall (then crashes down on that glass lip sealed slightly below the water level on that right side).
Notice that the sequence is very appropriately: raw water from above (display), dropping to the far right (first) chamber (you can see the skimmer cup just behind the post)... then to the refugium... then to the sump proper before being returned (pump) to the display.
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"If you give a man a fish, he eats for a day... but if you teach a man to fish, he eats for a lifetime."
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