I was considering getting one of the Eheim (classic) canisters for my 55 g. I visited their website and saw a diagram on how to place the canister intake and output tubing in the tank. Does the tubing have to be set up like this? I would imagine it would be more effective with the intake on one side of the tank and the output on the other. I can see how their setup could be beneficial, creating a type of eddy current. Has anyone ever tried placing the tubing otherwise?