Bought my BARW skimmer about 6 months ago and set it up. It is a HOB type with the pump in the tank. Anyways, at first it seemed like it was working pretty decent. Then it just goes haywire, the bubbles don't bubble up like they should, and whatever it skims out looks either clear or milky. There is never any dark sludge. I tried shortening the tubing going from the pump to the skimmer, so that the pump is now only about 2-3" below the water line, but still no luck. Anyone have any suggestions?