Got this thing a week ago, so I plug it in and its making a lot of rattling, well its not air so I decide to rip it apart and clean it being real careful with everything. When I go to remove the shaft it wont budge, is this normal? So I yank on it some more then *SNAP*. Well this blows, now I have a fish tank with no filter. I order a new shaft and overnight it for $30. It inserts fine no problems, go to put the impeller on it and a huge chunk of the magnet cracks off when it goes in. Waiting on a new one to arrive now. What the hell am I doing wrong here.