One other thing in the mix: FX5's SAY they use 50 watts. Xp's and 'Fluvals have a differnent wattage on their motors than is printed/posted on their operations paperwork/boxes. So if wattage is a big thing, the sump is first, followed by the canister inline but most guys I know put it BEFORE the sump.reptileguy2727;4443735; said:Definitely the Fluval FX5.
A canister filter is better for mechanical filtration since it will force the water through the media rather than ask it to go through the media the way any open filter will.
If you did a sump then I would have an inline canister after the pump on the way back up to the tank.
Don't know and will keep an open mind uptil I start sumping myself, shortly.