Another type of Zoanthids, these orange ones remind me of little umbrellas. The green ones to the right were consumed by hermit crabs. Zoanthids are a soft coral that is similar to button polyps or Palythoa. They are good beginner corals, as they don't need special feeding. Good stable water conditions, decent lighting and normal temperatures assure good growth. Make sure salinity stays near 1.026sg, not higher.