Heteractis magnifica is carnivorous, feeding on small fish, shrimp, isopods, amphipods, mussels, sea urchins, and plankton. This species also absorbs sulfur, nitrogen, and other essential nutrients for growth from the waste of the symbiotic clownfish that live within the tentacles of the anemone. The clownfish also occasionally carries chunks of food to its host.
The anemones use their stinging nematocysts to capture prey that touch them, and then bring them in to the oral disc to digest. They also contain symbiotic algae that produce glucose as a product of photosynthesis, which the magnificent anemone uses.
Animal Foods: fish; mollusks; aquatic or marine worms; aquatic crustaceans; other marine invertebrates
Plant Foods: phytoplankton
Primary Diet: carnivore (Eats terrestrial vertebrates, Piscivore , Eats non-insect arthropods, Molluscivore , Eats other marine invertebrates); planktivore