I have a Reef Octopus NWB200 skimmer that I just can't get adjusted right. No matter how much I adjust the gate valve I still get a collection cup full of water. I'm wondering whether the amount of water in my sump that it's sitting in has something to do with it. The level is below the discharge pipe but it is sitting in 6 1/2 inches of water. Since I need that much water in the sump so that tne external pump doesn't suck air should I try raising the actual skimmer. Anyone have the same skimmer and what level is your water?