Hitchhiker SPS ID

[returnofsid]

I've got this coral growing on a Zoanthid rock. I noticed it about a week ago and it's grown larger since. Decided to try and ID it. It's hard skeletoned and polyps retract when moved. I'm almost positive it's an SPS of some kind. If you look closely, you can see the polyps. They're a darker red/brown than the tissue between fluorescent green coralites. Wondering what kind...lol. Thinking some type of Montipora maybe?? Any guesses??

 

[Whisperer]

From the look of the coralites in relation to the polyps, it looks like an acropora to me. It is very difficult to ID that thing right now.

 

[returnofsid]

The coralites are raised, so I would tend to agree.