pocillopora corals contain microscopic symbiotic algae (zooxanthellae) living within them. through photosynthesis, these algae produce energy-rich molecules that the coral polyps can assimilate. in return, the coral provides the algae with protection and access to sunlight. the polyps also feed by capturing tiny particles using their tentacles. these corals are widespread because they sometimes attach to floating objects and can be carried far afield by currents and wind.