I'd have to agree with Incysor, as I'm the owner of a 12 gallon cube with upgraded lights from nanocustoms...
You can add a simple mod yourself; that would be the T-5 by commodity axis. You should be able to squeeze two inbetween your current lights and daisy chain them for power...
Acros among my SPS corals are difficult to keep, in the beginning but after they get accustomed to your lights and water, watch out, they do great...
I speak from experience I haven't lost any of my acros and I have 2. I've had them in my tank since December 04...
They bloom every day.... I did have trouble with and lost a digitata, but it was because it got engulfed with algae...
Mike