any help on what this is please

[rooked]

this has been growing on a piece of live rock, from a tank shutdown.
any help with what this is would be appreciated.
Thanks

 

[animalkingdom]

maybe hydnophora

 

[Allmost]

at least the polyps look like Hydnophora pilosa

http://coral.aims.gov.au/factsheet.jsp?speciesCode=0364

but could be wrong, as we cant really see the skeleton in the pic.

 

[rooked]

Thanks for your help

 

[smtank]

That looks more live Pavona to me.

 

[Frick]

I was going to guess Psammocora stellata or a Pavona species. Going to have to take a pic when it is not as puffed up and the polyps are retracted. The detail of the skeleton would help clarify.
http://coral.aims.gov.au/factsheet.jsp?speciesCode=0640
http://coral.aims.gov.au/factsheet.jsp?speciesCode=0289