intake or output

Planning on having 2 FX5s in a 180g. Any suggestions on where to put the intakes and outputs? I thought of the intakes on either side and the outputs in the middle. Thoughts?

I just set up my new FX5 this morning, and it made me consider placement of my input and output tubes. I ended up putting the input/outputs on the same sides of the tank as the existing canister filter that I have set up on the tank. My thought was that if I put the input of one filter next to...