Some good reading here:
Acropora ID mini-class
You might also need dissecting scope.
I hope you become resident expert, so I can send you some pictures of my corals .
I got those 3 books and they didn't help me a bit without the scope.
Good luck.
__________________
Denis
150g SPS reef;3x250WHQI,Tunze Streams,Wavebox,Neptune Apex,fishroom in basement
,reefing since 93,SPS since 99.
TOTM June 2010