I run mine in 5.75" of water. Run the gate valve wide open until it breaks in (CoralVue recommends 3-4 weeks break in) then adjust the water level as needed.
During the break-in period you are probably going to have to run it wide open ( valve to the Left all the way) If you don't, it most likely will overflow.
After a couple of weeks you can tighten the valve ( To the right ) until you are happy with the skimmate you are getting.
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