DfishH,
Per your question, with your type of lighting acropora's would be difficult to keep. They may survive but they won't thrive. SPS corals in general do best under MH lighting (that is why I just spent the money on a new fixture). I really wanted to keep acro's badly(under my compact fluorescent lights) and even tried to add some frags. When I first added them to my tank they did well, but then they just started to fade because they weren't getting the light they needed. Luckly they aren't completely goneyet and in the short amount of time I have had mt new fixture running it seems like they may actually perk back up!.