So I just received my [FONT=Arial, verdana, sans serif]Coralife 125 Gallon Super Skimmer Protein Skimmer Pump with new air silencer plugged it in and it does exactly the same thing the last pump was doing. Is it possible the impeller it came with is bad? Im used to seeing a little black plastic knob on the end of the ceramic shaft that runs through the magnet however no such end exists. Not sure if it needs one or could something else be wrong? Will post a pic in a sec[/FONT]