Claim: The polyps of Pseudoplexaura porosa spread out their tentacles to feed on plankton and other fine organic particles both day and night; while the octocoral has symbiotes in the form of single-celled protists that inhabit the tissues.
Evidence: The polyps spread out their tentacles to feed on plankton and other fine organic particles both day and night. The octocoral has symbionts in the form of single-celled protists called zooxanthellae that inhabit the tissues.