Hello! I am cycling a 10G tank with Marineland's Power Penguin 100. I set up the filter yesterday and the carbon cartridge is apparently slowing down the water flow, which does not allow the bio-wheel to spin. When I take out the cartridge, the wheel will spin just fine. I am wondering if I NEED that cartridge? What are my options if I want to get rid of it? I think building beneficial bacteria in the bio-wheel media is much more important than the bacteria that might grow in the cartridge, but I'm just a beginning and would love to get some advice!