That is pretty warm for a plate. Different corals liive in different areas of the "reef complex". Some corals live near the top of the water and need lots of flow and very bright lighting and can handle 83 degrees. Other corals, like plates, don't actually live on the reef proper. They live deep in the sandy subzone of the lagoon where it gets more food from the water, less light, and cooler temperatures.
A lot of people wire computer fans into custom hoods and blow over the top of the water to cool it down.
BTW....if it hasn't lost it's tissue yet, twice-daily feedings of meaty seafood might help you. It might have just expelled it's zoox so it is going to be almost 100% dependent on outside food sources. However, if it is sliming or melting in any way, you will want to put it in it's own tank so it doesn't foul the water in your main tank while it's recovering.
Here's a great link on
coral reef zonation.
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Zonation is a very important concept when considering any ecosystem, with coral reefs being no exception. A particular ecosystem will typically be divided into zones, each one having a particular set of physical parameters, such as light intensity, that set it aside from any other part of the ecosystem. A zone is defined by its physical parameters and location within the ecosystem. Within a particular zone, various organisms will have evolved such that they are adapted to thrive under those specific conditions that are present within that zone. It can undoubtedly live somewhere else, in a similar zone or sometimes even one vastly different, but there is always one in which it will be perfectly suited and as a result out-compete any other organisms that occupies that niche in the food web.
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