I have those. I think they are Ding Dang People Eaters. The colors shift on mine quite frequently (even thought the day, but especially due to spectrum & intensity) so I sometimes see them called different things, but they are a rad coral. I originally got mine from Brandon (I think that's his name) who runs zoanthids.com at a frag swap in Nashville as an unnamed polyp. I called them galaxies until I discovered a match.
I sold my colony with my last tank in May when I moved from Chattanooga, TN to Seattle and just got a 3-head frag from that colony a few weeks back. It's already up to 6 heads. Strong grower, beautiful polyps. It's a stunner. Congrats!
Mine:
Verification:
https://www.canadacorals.com/products/hawaiian-ding-dang-people-eater-palythoa
https://www.reef2reef.com/threads/ding-dang-people-eaters.106400/
https://www.reef2reef.com/threads/pe-zoanthid-catalogue.33354/