Ok i have had my skimmer running for about a week. It is very difficult to get the bubbles set at the same spot in the skimmer. They seem to have a mind of their own. Is this normal for a skimmer that's breaking in? Sometimes the bubbles fill the whole tube and other times they are barely in the tube. It also seems that every time i top off the tank the bubbles increase quite a lot and i have to empty the collection cup but then they settle down. The water in the cup is a slightly brown color so i am assuming it is doing some removal also. Has anyone else had these same issues and if so when do you know the bubbles are set correctly and the skimmer is "broken in"? Thanks