Please Help ! First Grow Going Sideways !!!

Looking like heat stress now

Cookie Rider said:

Too dry and it will uptake food faster, causes burn and leads to lockout.

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Between 41 %- 52% humidity and 17 -22 Degrees so thing that's in range

supermar11 said:

Between 41 %- 52% humidity and 17 -22 Degrees so thing that's in range

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It's close, maybe a bit more humidity and possibly higher temps.

http://www.just4growers.com/media/23637/vpd_1degree.gif

I tried to follow this chart my last two goes.
A good reference point.

I have found going over .8 lead to too much uptake and then lockout. Especially w strong food ratios.

Can anyone please let me know if these brown hairs are normal or is it mold you think? Any help would be much appreciated