2 MP10s is plenty for a 60 gallon cube. I own a Tunze and Vortech and won't be spending any more money on Tunze. The "directional" control is all just hype.
I use my MP10 on a Nano Cube that is roughly 18x18 and get flow everywhere in the tank.
Yes, you will miss the controllability factor. I was actually looking at starting a 60 gallon cube a few weeks ago and Ecotech recommended 2 - MP10s for the setup. They put out almost an 18" wide flow once you get out to about 24" or so. 2 of them will do everything you ever need on that size tank.
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Ryan
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Current Tank Info: 50g Cadlights/Giesemann Spectra (250w Radium, 2 ATI Blue Plus, 2 ATI Actinic)/2 x Vortech MP10wQD/Skimz SN123/Eheim Compact 3000+
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