Depends on how old they are, and exactly which species. Biologically they are predatory and opportunistic scavengers. Generally they are carnivorous, but will subsist on algae and decaying organic matter (like other dead animals) when needed.
As tiny pippers (polyps) they eat algae, plankton, organic debris.
A bit bigger they will eat worms, and anything that they can catch.
As they get older, they move onto shelled animals, like oysters, clams, crustaceans (small crabs), sea urchins and mussels. Some starfish eat other starfish, too.
As tiny pippers (polyps) they eat algae, plankton, organic debris.
A bit bigger they will eat worms, and anything that they can catch.
As they get older, they move onto shelled animals, like oysters, clams, crustaceans (small crabs), sea urchins and mussels. Some starfish eat other starfish, too.
