I'm toying with the idea of adding a second canister filter...thing is would it be better to install it in series... i.e. intake to filter 1 outtake to filter 2 intake, and filter 2 outtake to tank, or in parallel using y sections to minimise pipework to the tank. or would it be better to run completely independently? At the moment i'm running a tetra ex700 and an internal rated at 600lph for a 55 gallon tall, I was looking at losing the internal.