安达曼海礁石上，红海鞭珊瑚在潮水中摇曳

whips (Ellisella ceratophyta) sway in tidal current on a shallow reef crest, a flow-dependent behaviour central to their survival and reef ecology function. As gorgonian filter feeders, sea whips rely on consistent water movement to deliver the suspended plankton and organic particles they capture with surface polyps. Tidal flushing also removes sediment from their branches, which would otherwise block feeding surfaces and cause colony decline. 4K, horizontal close-up detail, scuba diver POV. Ko Haa, Andaman Sea, Krabi Province, Thailand.