Newbie - help identify coral?

[Delphinus]

I'm guessing Pseudocorynactis sp. or Corynactis sp. anemone (actually "corallimorph" not "anemone" but close enough). An occasional hitchhiker on rock, doesn't like light so much. Sometimes called "orange ball anemone" because the tips can be tiny orange balls. There are all kinds of species in these genuses, some large, some small, and I think they can come from both the Carribbean and the Pacific.

(If that's what is is,) they're completely harmless. They don't really spread like other pest anemones (aiptasia, majano, etc.), they just kinda keep to themselves.