I just bought a skimmer. First one I've owned. It's really making me feel deficient. The bubbles go up the cone and overflow into the collection cup. But the cup just fills up with water instantly. If I adjust the bubbles down the never reach the top of the cone meaning it never collects anything? Will it build up organic waste and eventually spill over into the cup? Do I need to adjust it so the bubble are to the very top of the cone?