Pinky thingy

[Rocha]

Rock? No! I'm not sure if I would be able to tell from only the first picture, it looks really odd there. But it looks much more like the usual cup coral on the second photo...

 

[Rick Murchison]

It is a cup coral, genus Tubastrea.

Good call Luiz
Had we had the second photo first...
Nah, my excuses are unacceptable - a clean miss!
Thanks.
Rick