What powerhead

I have a cube and flow is tricky. I would recommend Vortech. Just be ready though because I do believe you'll need 3 different powerheads to get your flow where you want it
 
I ran two MP 10s on my old 50 cube and they worked great. A pair of any programmable powerheads with at least 700 gph should be fine.
 
If you can do a vortech, I'd spring for it. Very nice pumps, and you can rig them to run a gyre if you want that flow pattern.
 
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