If you can, go overkill with GPH and get a DC controllable pump. That gives you lots of options there. You can always throttle them back, which is really nice.
Otherwise if you're stuck on the Magdrives (so am I... I love them) go for the 12 for sure. I had a similar setup with the 9.5 and I easily could have handled more flow.
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They call it addiction for a reason...
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