Coral Identification please...

[Haro bob]

I was wondering if anyone knows what this is ?
I took over a person's tank and this was in it.. Orson a small rock about 2 inches.. It only opens as seen in pic.
Thanks

 

[Haro bob]

The tentacles only get as big as they show in the pictures

 

[Daddi0]

Welcome! That is GSP/Green Star Polyps

 

[Haro bob]

Even if that's as far as it comes out

 

[aromano]

hard to say could be a montipora, cyphastrea or astreopora