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I only worry when I go beyond 83. At 81 I think you're safe.
My water temp usually stays between 80-81 in the summer and Im fine with it. as long as it doesnt fluctuate from 78 to 81 in a short amount of time I think you should be fine.
When I was in Pensacola a few years ago the water temp was close to 90. I don't think anything in the 80s will hurt the fish. However this is a controversial topic. Someone posted a really good article that I can't find about how temps in aquariums can be much higher then people think. I keep mine at 79.

