plant needs help!

the larger fan leaves around the middle of my two plants have begun to yellow around the edges, and even turned completely yellow. as you can see the one has developed brown spots on it. i had mites but have been fogging for a couple weeks and they seem to be gone for the most part. my ph is too low but i would like to know if there is something else i should be concerned with. the leaves also slightly curl under and die at the tips. im a noobie and am in need of some serious help. thanks

https://www.rollitup.org/marijuana-plant-problems/162605-leaves-dying-flowering-pic.html

I have same issue and found the above a good read on this problem. Good luck.

whoa? Heat isssues?

Leave the fan on at night..to exhuast the excess heat out

thanks a lot. any idea what those brown spots on the smaller leaf are? they are a recent problem and i hope they are not pest related.

the room temp is controlled around 75 with the hps about 3 feet above the tops. the a/c is running most of the time and a moving fan is on 24/7