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Looks like nute burn or PH issues to me. Whats your ph of the water going in?
If you know you put too much nutes in before then thats probably the problem. 85-88f is hot but not too hot. As long as you have a fan blowing over the tops of them they should be ok in those temps.
Ph issue for sure! Piss me off too. We ph our water always. We took the plant in the pic and flushed it 5.4 - What the hell causes that to happen? we worked late into the night fixing this issue. I took the sunshine #4 and ran water thru it and ph'ed the run off, actually raised the ph alittle. so what the hell makes it go south. How does one prevent it?
Thank you to everyone who offered advice.