I kept the 600 on my bakpak but I added a wooden air stone, skimmage was out of this world. I put rigid airline tubing down through the collection funnel and then put an airstone on it and put it right at the bottom of the second chamber, I didn't have bubbles coming into the tank and I had thicky ugly grungy filthy vile skimmage. It was great.. then I gave it away.
Doug
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