browning leaves

Thank you ahead of time to anyone who takes time out of their day to help me out! So I’m in what appears to be a somewhat dire situation with my single purple thai plant. Up until now, things have been going pretty smoothly and consistently. Maybe a bit slow growing, but it’s a strain with a...

Everything was good then noticed this on one plant. Thanks in advance for your help.

This Browning just appeared. Plant has been fertilized a few times over the summer, water well, in good sun. This suddenly appeared in the last two days. What can I do??

Fan leaves are browning at the tip/turning up and feel crispy. and seems to be moving up the plant. With the same browning at the tips.. Roots are slightly brown and im pretty sure its not nute stained. Temp=75 RH=50% Nutes=400 and i just changed the reservoir 3/25/16 when the problem was...

So it starts at the end...then moves to the sides and moves down the veins while the veins stay green. Eventually it takes over and everything looks burnt and crispy. PH today: 6.2 PPM: 1170 ppm - water is 290 ppm from faucet 67 days in flower...i put them on flower on Thanksgiving. It...