Brown leaves

Hi, it's a deficiency of P in the advanced stage, this deficiency causes growth to stop. There can be different reasons, a high pH or very clayey soil. Measure the pH you have in the soil, I think it's due to that! Good luck!

I would say she just needs a little food now. I don't know if you've been feeding them but now is the time to introduce some grow based nutes. Check your ph of soil and of the liquid feed is correct like the others said.

Correct ph water and soil ph would be where to start. Then they appear to be thirsty as well. Good luck and happy growing 🌲🌲🌲👊

Hey man there not nute burnt and if ur in soil its def not ph unless u put some shit that did not come with the soil into it. Check ut out ur plants hungry either give it some nutes or microbes like recharge and keep it alwats moist if u use microbes or theyll die off also if shes just hella thirsty itll happen to my lil clones usually never from seed but im always feeding. Give ut some cal mag for sure absolutely right away and real growers recharge if u cant get that then worm castings mixed in water so it looks like a tea eitght cup 2 gallons

Hey, i had exactly the same looking problem n it was bout PH problem my ph was more than 7 and got phosphorus lockout, you got to take a look to this link, i hope it helps you : https://www.sensigarden.com/phosphorus-deficiency-marijuana/

In regards to your leaf question; How close is your fan? (Looks windburned). Are you using fertilizer; and if so how much?