Penn-Plax Silicone Sea Anemone - Sways with your tanks water, creating a charmingly realistic display of movement. It also provides a nice place for fish to hide, play, and explore! It is safe for both freshwater and saltwater tanks.Sways with your tanks waterCharmingly realistic display of movementProvides a nice place for fish to hide, play, and exploreSafe for both freshwater and saltwater tanks