it's an acropora of some sort. kind of early to distinguish the exact species... give it good lighting after acclimation and it should color up just fine for you.
rgr... it was 10 bucks... Ive bin picking up small Sps frags.. outta the sps tank at the lfs... last weekend i got one... but only when i got home did i realalize that the one side was dead....
this one i acclamated really slow (over 2 hrs) im sure it will be ok...
with all the AEFW's, red bugs that are out there now, you have to be very careful in checking out frags to be sure that it's clean and you don't bring home any unwanteds.