I feel pretty strongly that it is either a Valentines Day Massacre or the Red Devil Paly sold by the ATL site. I am definitely leaning towards the Red Devil. I have both polyps in my tank and they show slight differences as the Red Devil Paly has a slightly different disk coloration than the VDM and the Red Devil is overall a "thicker" polyp.
Btw, if it is a Red Devil, you will love the growth rates on them.