ok it's gonna take me a little while to change the drawing, but what if i make the main drain dump into the sump, then it goes to the skimmer right away. Then have a small pump moving water up into the fuge then draining back into the sump. I'm probably going to have a closed loop on the tank to increase flow so i'm not worried about losing the flow from the UV sterilizer, otherwise i could give that it's own pump too.