Nute Burn ? Correct me if im wrong...

Went to a buddy's house to see a micro setup he has going he is worried about one of his girls. I looked at it I told him he was over fertilizing them. He doesn't agree so we're gonna ask here for your opinions.

Using Fox Farm Ocean Forest as medium. Plant is in a 16oz cup and is about a month and 1 week old. It is a Fem Atomical Haze from paradise seeds grown from seed. Problem started about two weeks ago after watering with PH 6.5 400 PPM solution the first time and then 280 PPM the second time about a week apart. Plant was flushed yesterday still seems a bit droopy; affected leaves feel crispy and dry. Humidity has been extremely low between 20 - 30%. She is under 6x 26watt CFL's (2x2700k 4x6500k). His grow space is extremely limited so 16oz cup it is. This is suppose to become a bonsai mom; to provide clones for a tiny flowering space.

First it was the very bottom leaves that started to turn yellowish almost burnt kind of color, it has slowly progressed to the middle and top leaves (oldest); new leaves are growing in between all these leaves and have zero damage.

There starving a deficiency your budy has time to start a more agresive feeding plan or look into a more
Diverse nute line up like technoflora or DG

Nutrient deficiency

Increase the PPM, if you don't act fast you might lose the plant.

First Transplant to bigger pot! try to raise Humidity to about 60%.

and if height is an issue, at least put in a wider pot...especially if you plan on using as a mom, for taking cuttings from... and it will help her grow.

i had the same problem, is your friend using R.O. Water? if so u need to raise ppm just like what k0ijn said

Thanks for replies I told him and he went into a panic LOL.

He uses tap water it comes out at PH 7 about 50PPM he lets it sit for 24 hours. Watered last night with same 280 PPM water immediately couldn't add more nutes because he was out. Tonight (about 9pm) he transplanted into a two liter bottle, and then watered with about 500 PPM PH 6.5 water. Just got the pictures and definitely perked up a bit, so i guess they were thirsty as far as leaves needing nutes only time will tell. Humidity is still low I suggested he spray fresh water into grow space air to raise it up but he says he has to do it every 20 - 30 minutes LOL.