The Florida temp thing this summer while high is possibly blown out of proportion. 1931 showed higher temps in Florida but surface water temps were not taken. It is not a fair statement to say its the highest temp in history because we do not have enough data points throughout history. It is a possibility that mass coral die offs are one of the ways reefs grow so rapidly, the dead coral skeletons providing a fresh foundation for new corals to grow. This is just a theory, I'm not claiming fact.