How much water are you needing to be moving?
I did a similar thing with a server power supply I hacked as a COB power supply because it was too loud, unfortunately it got way too hot in a sealed cooler box and kept shutting off. Likely the pump will have an overheat trip as well. You could put it in a cheap esky (cooler) and add fans to that. One feeding air in, one blowing out?
Here is my set up, which has an inline pump and res underneath so that the pump fills the buckets from the bottom and the overflow runs by gravity back down into the rez. This way I only need a small 12l a min pump which is completely silent.
Overflow gravity drain
Crappy pic but this is the pump side.
The whole thing is plumbed in so that I turn one tap to drain it, and one tap to refill. Makes for the easiest refill ever.