Awful mag drive pump noise

[brizzo]

So I recently built a 20g for my boss, simple enough tank to get his feet wet in saltwater. I drilled it for a small closed loop system with a Mag-drive 350 ..

All is well except for the awful noise the pump makes. After some digging around it seems the mistake was using a magnetic drive externally.

The pump is also plumbed in using spa-flex, anyone have other suggestions how to quiet it down? I've been pondering how to submerge it behind the tank...

Thanks!