If you bought a used MP10, make sure you have a spacer (or thick enough glass). I bought my first MP10 used, but it didn't include a spacer, and as I ran it on my thin glass biocube, it definitely started burning out the bearing making it squeak and squeal very loudly, until it ultimately seized (and I haven't been able to repair it yet). So yea, just a heads up on pre-owned vortechs.