First are Mags good as an external pump, I have read about them leaking, this is not from my experience but just what I have read when researching pumps.
Second if you ditched the closed loop and spent the money instead on upgrading to a higher strength of Tunze stream, might this not work better. The 6060's are not controllable but the more expensive streams are, you might consider this option.
I have one Tunze 6060 stream for my 120g tank, you might find these are a bit large to place in the front corner of a tank.
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