browning/ curling fan leaves. help please. PIC

any idea whats happening? its weird because this is the only plant doing this. and if you look at the whole plant only a few nodes are effected.

any comments/advice welcome.
Thanks

Looks like major nute burn to me. Just my opinion. You change somethin up recently?

what is the temp of your room it also looks like the leaves are fanning up

what should be average grow room temp? whats max they can usually take?

Do you have a fan blowing directly on the plant? i had a similar problem, the fan seemed to dry out the leaves and stunt growth a bit.

use superthrive at 5ml per gallon all the way to transition. maybe try turning on a fan and keep the temp at a steady 78F and the humidity between 50%-60%. if you run the fan 24 hours you will train your plants to be stress and shock resistant and in my opinion it can increase your yield.

honestlty that plant looks like its already too far gone. all the leaves are rippled and the plant looks almost deformed. toss it.