Requesting an ID on coral hitchhiker

[Sierra_Bravo]

Three heads, stony body, the entire thing is between 1/4" to 3/8" across. The rock came out of the Gulf of Mexico. I'd just like to know what type of animal if a species cannot be identified. Thanks in advance.

 

[justin.k.nelson]

looks kind of like a rose anemone.

 

[cloak]

Hidden Cup corals.

 

[Sierra_Bravo]

Hidden Cup corals.

We have a Bingo!

Thank you for the ID - now I can see if I can read up on how to keep it going. Without that name I could not find an ID anywhere no matter how I searched. Thanks much.