Those are Palythoa species (and judging by the morphology what used to be classified as Protopalythoa)- take a very close look at the polyp stalk (maybe using zoom) - they should have sand or other bits of detritus incorporated into the structure.
Genus = Palythoa
Species name = no clear idea, although I have seen a lot like these in nature... classification to the species level needs work.
cheers,
James