Help ID Florida Hitchhiking SPS?

[VR28man]

This encrusting SPS came on aquacultured live rock from KP aquatics. I thought at first it was Porites braneri, but now that I've seen its polyps extend fully, its polyps are waay longer than any Porites I've known (though admittedly i've only seen the indo-pacific ones)

On top is dead sections of the colony, bottom is live sections.

Fully extended polyps:

 

[._Z_.]

Hydroids?
https://goo.gl/images/n7FHZq

 

[29bonsaireef]

Golf ball coral. Favia Fragum

 

[Navymedic]

I had something like that too, ended up being a gorgonian

 

[joetbs]

I'd lean towards Madracis