Need Coral ID

[dare2dv8]

Bought myself a Christmas Wrasse and when I was putting him in the tank I found this tag along in the water from the LFS. Must have been scooped up in the net.

Since the picture he's been more securely attached to the liverock. It's fairly common as I've seen it several times in stores but I can't seem to find a pic online that confirms what it is. A finger coral or a leather of some kind?

Thanks in advance.