Adding a filter to a water pump

[RabidWombat]

I haven't made the DIY one yet. It's on the to-do list of the next two months. I think most of the time these are standing. You get some help with gravity/suction on the intake. I'd think you could lay it on its side, but you may just need a slightly stronger pump.

[deranged chipmunk]

oh ****, my apologies, i missed the post previous to mine. not that canister filters won't work on their side, it is not wise to lay them down. unless you LIKE draining your tank.