Perhaps the corals don't like the temperature changes. Gee, I wonder what causes temperature changes and other weather anomalies, couldn't be climate change, could it? Corals in the Maldives, the Seychelles, and Jamaica seem to be suffering from warmer temperatures, but I guess that means nothing to you. Perhaps you should warm up your mind a little, it seems to be getting numb.
Oh, but look, the article did mention Florida's coral reefs are not the same as they used to be and are suffering from higher temps than normal, too.
Coral Reefs Disappearing Fast - The Early Show - CBS News