I have a question hopefully someone can answer. I just setup my new Odyessea CFS500 canister filter on my 55g today and I have the intake and discharge setup on opposite sides of the tank and its making a nice current in the tank the way I have it setup. My question is... Why do I see alot of people putting the intake and discharge on the same side of the tank? Wouldn't all the clean discharged water be sucked right back up again? Or no? Explain...