Does anyone know what this is?

[Novicereefer]

Saw this at a Petco and the polyps caught my eye. No one knew what it was. Can someone help me identify it? It's the green coral.
Thanks

 

[Udest]

Hydnophora Horn Coral likely sting packs a punch but is a good grower from what i read .​

 

[Novicereefer]

Hydnophora Horn Coral likely sting packs a punch but is a good grower from what i read .​

Oh?! Thanks! Never heard of it. I'll read up on it. Thanks!!