I will be going back to petsmart sometime this week to take back some un-needed things that I already had. will look and see if they have an impeller. If not I will dig the net and see what I can find. right now I have the panty hose on it, which has slowed it down quite a bit...though the wife wants is off
Here is a link of the 20 we've been talking about, since i got it running again before dinner.
my new 20G