I’ve had a few chalices and they don’t have any tentacles at the growth margins only the Polyps or ”eyes” and any growth will be colored up, not like the white we are typically used to for some sps.
That’s really tough to tell. Your corals tentacles are obviously out so if what you see matches than it’s tentacles. Plus that’s not a chalice coral either, but looks more like an Ancathastrea.