Light is primary food source.
Zoanthids feed both by photosynthesis, aided by the zooxanthellae they contain, and by capturing plankton and particulate matter. Although photosynthesis aids in their nutrition, even species that do not actively capture plankton cannot live through photosynthesis alone.[21] Zoanthids can eat meaty foods, such as lancefish, brine shrimp, krill and bloodworms