Help diagnosing black leaf edges / darkening of G13XHaze bud tops (pics)

Hey Guys!

I've got a couple of G13/Haze's in a DWC set up and the buds are starting to really swell up and get big (day 42) but I'm a bit concerned I have heat stress. Here is a pic...
IMG_3053.jpg

But whats weird is its not happening just in the middle of my canopy.. Some are under heat and others aren't. But not all are showing this yet... I'm a bit concerned its mold. I turned off my fan to take pics last night and forgot to turn it back on.. it reached 65% Humidity :sad:

Thanks for the help

https://www.rollitup.org/grow-journals/420241-dwc-g13-x-haze-tga.html


P.S. (Edit) I also forgot it might just be turning purple and is starting out really dark?
 
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