I'd recommend getting some ventilation in there as soon as possible. That may or may not be contributing to your problems. But still, 85Ā°F is a little on the warm side, and stagnant air is doing nothing to help matters. And with your light being constantly on and the temps being pretty constant, your plants are transpiring faster than they would on an 18/6 schedule. Your humidity could be a little higher, but low humidity is much less of a potential problem than high humidity. Lower your temps, and the humidity should naturally begin to climb. Warm air absorbs more moisture.

I don't know anything about the brand of soil you're using, though it looks like it could use a little more perlite. As for pointing out a more specific diagnosis, I'll leave that to the more experienced growers. With the specifics you've listed, someone should be around soon to lend their opinions.

Good luck. :jointsmile: