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correct... sort of. Slide the plate down so that it is lower(!) than the sump wall/dam. Just slightly (say 1-2")
This will insure that the water overflowing the skimmer partition wall will spill over and crash down on the plate (since the sump wall maintains the water level higher) then be forced horizontally just across/under the surface of the refugium portion, creating the rolling water flow you seek.
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