I have a new 29g tank (2 weeks old) and just started running my skimmer 3 days ago and have alot of micro bubble coming from the skimmer. The skimmer is an insump Turbofloater 1000 that I bought used and cleaned thouroughly with vinager before I used it. Its pulling a bunch of real brown crud (full cup the first night) so its working great but ive got quite a bit of bubbles making there way to my display. Is this normal?? Is it just temporary or is somthing wrong??