Well I just tried my pump and it leaks so that appears to be out of the question. Even though the input and output have tubing attachments, the housing is not watertight. Bummer.
The Zoo med looks pretty slick though, I think I may look into a DIY canister filter afterall... I would just need to buy a container for it. Time to lurk in some DIY canister threads.
Thanks for the input guys, I appreciate it!