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Red macroalgae (Rhodophyta spp.) colonises the branching structure of a gorgonian sea fan on an Andaman Sea reef, the vivid overgrowth marking tissue that is stressed, dying or already dead. Gorgonians are among the slower-growing coral organisms on a reef, taking decades to reach maturity, making their loss to algal overgrowth a long-term setback for reef structural complexity. A dense cloud of glass fish moves through the water column directly behind the affected coral, the reef ecosystem continuing to function around the deteriorating structure. 4K, horizontal, close diver POV. Andaman Sea, Krabi Province, Thailand.