I am currently running a cpr backpack but am having trouble getting any skimate out of it. When I first purchased this about 6 months ago I was getting great skimate out of it with the stock rio. Well it kind of went through a slow decline even with regular cleanings. So, I decided to upgrade pumps to maxijet 1200 and after 4 or 5 days still no improvements. I have tried adjusting this thing every which way with just no luck and I think I am ready to move on to something different. Also another requirement is it must be quite as the tank is right next to my bed. I would love to get a deltec but can't afford so that is not an option and I hate remoras been there done that...