I've had my tank as high as 85f.
Lights turn off at 83.
Fan turns on at 82
I very rarely go above 82.5.
When my tank went to 85 nothing seemed too bothered. Everything survived.
As an aside. I'm a child of the 80s and have travelled the world. For the vast majority of the world, everything is metric. Makes way more sense than imperial to me. Especially for conversion from one metric measurement to another.
However, I still measure my height in feet and inches, measure my tank on Fahrenheit, measure my weather in Celsius, and measure my car distances in kilometres and metres. We live close to the US who should be metric but isn't. We live in a weird place.
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