Not sure which Tim you're referring to...
Flow in a peninsula is tricky. Especially one(tank) that is not wide enough. A narrow peninsula is a nightmare to get the flow right and not have the surface scum on the opposite side. You can beat the surface with flow but if it has nowhere to drain, the surface scum will still collect in that pocket of water.
For my tank, you can see where the Tunze are. They are place ~6" from the glass pointed slightly at angle toward the center of the tank. This allows the pumps to push the flow to the end of the tank, and return it to the overflow. It's a double gyre approach with center channel being drained into the overflow. I haven't had any issue with surface scum with this set up.
Nick
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