You can read about Triactis producta at the Invertebrate of the month. Andrea Crowther wrote about this sea anemone and its association with the pom-pom crabs Lybia.

Lybia tessellata on black background
Photo: Lybia tessellata, Réunion Island by François Michonneau/FLMNH http://creativecommons.org/licenses/by/3.0/