bio wheel

I have a Penguin 150 filter system in my 20 tank. I noticed over the last week or so the bio wheel was slowing down and would stop from time to time. Over the weekend, it stopped rotating completely. 1. Is this an issue? 2. How do I keep it moving? I cleaned the entire filter housing, the...

I purchased this particular filter about a month ago. I had not used it up until today. I did as it said in the instruction manual and added water until it over flowed into the aquarium, I then plugged it into power and it kinda gargled for a little while (which I assume means it was gaining...