I am running one now. PATENCE, PATENCE,PATENCE is what I have to say. Fought this skimmer with over flowing well over a week. Basically had to sit and watch skimmer how it would react to water levels and gate valve adjustment. My sump is not in a cabinet and when sitting and watching tv, I was able to see skimmer reacting and adjust accordingly
Currently skimmer sits at 7" of water
I am still dialing it down, every two days cup fills. I run it wet, small bioload, just two fish
REMEMBER PATENCE!!!!!