Quieting pump vibrations
I am having some small/annoying pump vibration issues (mag 7 / Mag 5) in my sump. The sump itself is sitting on high density rubber padding, so the sound isn't being transfered to the tank stand. It is comming from the pump itself, if I suspend the pump off the bottom is quiets down.
What can I put under the pump that will cushion it, but not decay or leach into the sump water?