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See this article. It is not only heat that is causing the death of these corals but it would be a very big factor.Low flow was another possible cause in these cases from articles i have read.Also see the article lowering of ph in the water caould also be causing issues. I run my tank between 78 to 80 on STC but as i live in Norway i dont really have to worry about overheating.My friend has a big SPS display tank and runs it at 83 and it seems to be fine and growing like crazy. As said no 1 tank is the same and different things will work for different people.
http://news.nationalgeographic.com/2016/03/160321-coral-bleaching-great-barrier-reef-climate-change/
not to get in to a global warming debate, but ill trust the papers over a "good" story without any numbers or facts to back it up.
every year its the same info i get from these places. 50-100% loss of the barrier reef.
this has been going on since the 90s....
imo the barrier reef should've been one big white skeleton a decade ago if we went by sensationalism.