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Corals are really very bright.
It's just that without light it's not visible. Near corals are such because they are illuminated by a flash.

Yeah I can see, it's just nice to see corals thriving instead of dying like most of the corals in the World.

Yes, in many places, serious problems with corals. Bleaching eeching and mass death due to rising water temperature. But the bleaching does not touch the soft corals, where they are.
In addition, in Raja Ampat, the situation is not so depressing as it is on the Great Barrier Reef, for example.

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