Please ID my hitchhiker - Acan?

[ACBlinky]

I've posted about this little guy before and had no luck, but I'm hoping now that he's mostly recovered someone may be able to ID him.
I bought a piece of LR with a dying coral attached, started feeding it and it has responded beautifully. It looks like an Acan to me, but I'm not sure. Here are the best pics I have of it; I waited until it was less inflated to try and show the skeleton a bit.

November, just starting to puff up and look like it was going to pull through:

End of November, starting to regain zooxanthellae:

January, looking better:

February:

Today:

 

[ACBlinky]

Hmm, no ideas eh? I can try to get some clearer pictures tomorrow. Giving this a bump for now, so it doesn't disappear.

 

[Avi]

Well, as its growth progresses, it is starting to look a lot like an acanthastrea of one kind or another. Can you post a clearer pic?

 

[Kreeger1]

agreed