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They do appear to be Palythoa grandis, although very stressed. Definitely a Palythoa or Protopalythoa.
Agreed. Just FYI Protopalythoa is a defunct name
Yup! http://www.marinespecies.org/aphia.php?p=taxdetails&id=100795
If you don't know this is the taxonomic database that us marine biologists use quite often