Okay, so my canister filter came in today and I can not get it up and going. I put the media in the 3 trays, hooked up the intake and the output, filled the canister with water, still not working. The filter isn't pulling water in. I have a prime button, but when I push it, it can't get over the hump from over the top of the filter downward to the canister. What do I need to do to make this work? 
