Sea fans, also known as gorgonians, catch plankton in their polyps, which microscopic zooxanthellae then turn into gorgonian food.

• 海扇，也称为柳珊瑚，捕捉浮游生物在它们的水虫息肉，显微镜的虫黄藻然后变成柳珊瑚食物。