Fish tank filter not pumping water?

Question

I just replaced the filter in the fish tank filter pump. I turned it back on and the motor seems to be running fine but no water is being pumped so it goes through the filter and back into the tank. Something is turning in there because I can see some water in filter moving. Please help...already lost one fishy.

Thanks, Dean

Answer 1

 Thank you all so much! I figued this is what needed to happen and it worked! Yay!!