Ahhh!!! You got an air pocket in there. Best way to get it out if you don't have a prime feature... use a power head and force flow into the inlet, then turn on the filter while you are doing it. Give it a second, then turn off pwer head.
Should help force the air out.
OR.... and this is a HUGE OR. If you are brave....
Get a huge bucket, take the Outlet hose off your tank, take off any hardware on the end, just the hose. Plug it with your finger. Put over the bucket and pull finger off. The water is going to fly out!!!!! SO be ready!!!
Bend the tubing to stop the flow as hard as you can! Raise above tank level holding onto the hose. Hook up the outflow hardware and let er rip.
This takes a good quick hand, so be ready.
Disclaimer: I take no reasponsibility for any water damage if you mess this up...
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