Newbie question. My tank has been set up for about 2 months. I have a Aquavitro skimmer and I had this thing running beautiful - nice brown water in the collection tank. Yesterday I went to change the filter sock so I turned the tank off, changed the sock and started everything back up and now the skimmer is just overflowing with bubbles. It fills the collection tank up in a minute. What am I doing wrong?

