The few SPS colonies i have aquired so far are doing well except an Acro frag i got which has totally turned brown. The rest are having a steady growth at the tips, some browning at the base due to light being unable to reach the area ... cant be helped i guess.
I think getting single frags for sps is better than getting a whole colony since in the wild they grow according to the direction of natural light which may not suit the direction of our light in our tanks due to placement constrants.