I wouldn't think so, because people's tanks get to 82 and 84 all the time, and nowhere in my reading said they were particularly temperature senstative compared to other reef creatures.
If 80 is too high I would have suspected warnings from vendors about this, or in my other reading.
Not saying you are wrong though, it could be, I just hope not or else the nudibranch colonies in many people's tanks would be whipped out so easily.
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