Most Porites that are collected have Christmas tree worms (Spirobranchus giganteus) that bore into the coral, serving as additional aesthetic livestock.
Spirobranchus giganteus, the Christmas tree worm, a small tube-building polychaete worm species
The worms' most distinct features are two "crowns" shaped like Christmas trees.
Spirobranchus giganteus | Leucopaxillus giganteus | Giganteus Island | Brachystephanus giganteus | Blaberus giganteus |