[canadawest]

Looks more like what's commonly referred to as a Colt Coral (Cladiella), but could also be finger leather (Sinularia Sp.) Hard to tell without it fully expanded and polyps out, but looks nearly identical to my Colts when retracted.

In any event, both are very similar species both requiring medium-high lighting and low-medium currents. Fairly hardy species, does well in most environments.