the tall tube that the air tube connects to from the pump rotates, if you turn it counter clockwise it closes the valve and raises the water level(wet skim), turn clockwise and lowers the water level and you get a drier skim, you want to be in the middle of dry and wet. just have to tweek it to find the sweet spot in your setup here's a pic of mine 12 hours after setting it up pulling dry skim





"TEFLON DON"
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