While the sump is out you might want to drill it for a bulkhead and mount the pump outside, then you could put a pad under it to quiet the vibrations!!
I lookd up Quiet One pump and they can be run externally!!
Thanks JOJO, I think it is actually the pump, cause we had used it to pump water from our rubber maid and it was still somewhat noisy(it was suspended in the water, not touching anything). I think we will just end up filling the cabinet with some type of sound barrier. Not sure! Live and learn right...Next tank we will get a proper pump.
Hmmm, that would suck if it was a "wear" issue, it has only run for a total of a week with days in between...It's brand new...and it's the 9000 not 900 oops!