So I cleaned my fluval 306 today for the first time, found a baby Cory in it so that was surprising. Unfortunately, when I hooked it back up, it filled with water normally without much effort, I plug it in and I can hear the motor humming but nothing is happening! I pump the priming lever and some air comes out but not much. Anyone have any idea what's going on? The filter is assembled correctly, sealed tightly, filled with water and nothing. I ran to petco and got a HOB Ac50 for now, loses some fluval media in the base but I'm now paranoid of die off.