The Oase biOrb Yellow Starfish Set was inspired by the Protoreaster Nodosus (commonly known as the horned starfish), which is found in the shallow waters of Bali.  This set is a natural addition to any Saltwater biOrb aquarium. These sea stars add shape and interest to the bottom of your biOrb. The biOrb Yellow Starfish Set contains three starfish: Small (1.97 inches wide), Medium (3.15 inches wide) and Large (3.94 inches wide).