purple kush taking a turn for the worst Please help! REP4REPLY

Hey all, i have this purple kush clone i take a while back it did great in the beginning and grew nicely, then it out of no where just started looking down right sad, its always droopy but not in a under watered fashion, and now abunch of its leaves are drying up going yellow and sometimes turnin into a greyish brital texture where the leaf is practicly dead!
it still drinks all its water and drys out.. its still slowly growing.. the PH is around 6.0..
ive had people say its underfed and people say its over fed.. i gave it some food and still nothing changed. i even let it go awhile with just clean water, ive flushed it lots ive tried EVERYTHING!!! to get it too smarten up. and my other clone now is starting to develop the same sorta thing!!
do plants go really yellow and make their leafs go brital if their starving? what the heck is going on?!?! i really love this strain and its just really pissing me off that nothing is helping!
please take a good look and tell me what you think, is it starving? i do use well water, but ive never had problems with it before, but ive also tried flushing with carbon filtered water for awhile to see if it was the well water and still nothing!!
so any help would be really great!! i just want to figure this out so bad! oh and one of leaves is going a purplish brown startin from the tip, not the good purple!!!
GanjaFarma-

I'm gonna say poor lighting and over watering. What kind of soil are you using and nutrient cycles? I'm assuming your using clf lights, how close are they to the plants?

yea im no expert but to me it almost looks like nute burn.. or it could b root bound. or not enough lighting.
it could possibly be nute lockout from ph fluxuation

do they get fresh air every day?

i have it under a full spectrum H.O T5, ive grown the same strain last year with the same lighting and it did fine,
im using sunshine number 4 aergate plus, i keep the PH at around 6.0..
aswell i dont water it until the pot is DRY and LIGHT.
its got lots of roots but from what i know of root bound it doesn't effect the plant THIS serveraly, but i may be wrong.
my other plants i got are all doing fine besides for these two and they all get fed the same things. Maxigrow 10 - 5 - 14

i havent given it any food lately due too i thought it may be nute burn, but like i said in my first post, ive tried to flush it and ive tried to feed it and nothing seems to bring it back!!!
it just keeps gettin worse and worse everyday!
would it being root bound cause it too go mental like it is?
im really in a pickle guys!

oh and yes i open up my closet everyday a few times a day too let fresh air in.

rootbound can cause the plant to do alot of different things, even completly kill it. why i though of root bound is because when it gets rootbound it will almost stop growing and will kill off the branches it cant support. i would try to buy new pots and soil and transfer em. it most likely will help a bit even if it isnt root bound. it might b your soil ph that is off, witch has NOTHING to do with your water ph.

both of my plants are rootbound at the moment, because the roots grew while the foliage wus stunted from bein cold. so now i have 1 foot tall plants in 2/12 gallon pots that are rootbound. the root mass is about 3 times bigger then wut shows above soil ( in my case). just saying this because most people think they can judge the size of their roots from the size of the plant. witch is impossible to do.
just thought this might help a bit lol

pic is of my plants that are rootbound, but havent been damaged yet.
just so you know how big the root to foliage ration can be off

Yeah ill repot it forsure, the only reason i havent is due too figuring out how i'm gonna setup abunch of stuff,
and yea i know the soil PH is diff and i have checked it and its around 6 aswell, so maybe its due too the root bound like you say
thanks alot for your help! and +REP forsure.

Anyone else that has an opinion or a suggestion dont hesitate too POST IT!!!
GF-

They are hungry, just feed them. Also, 6.5 ph is better for soil grown plants.

everybody has their own opinon on ph levels. and straight up it TOTALLY depends on the strain. some plants love it bein around 5.8 and some strains grow best with it around 6.5
and yea thats why i havent repotted mine yet too. its a bitch hangin all those damn lights and setting up fans.. etc haha

Haha yeah it can be a bitch, the only time its fun is like the first time you get new shit then you wanna try it out but after you see how it works its like just another choure LOL

but yea ill repot it feed it and see what happens, its a such a beautiful plant when its healthy but damn it looks like it was beat by an ugly stick right now lol
it grows such dank weed though the shit makes your skull go numb its some good smoke, very high in flavor!
the funnyest part is even though it looks like its on deaths door step it still pushin out new sprouts LOL i fimmed it and topped it and it kept pushin out more even though it looks like shit im like wtf are you dead or alive wtf is your deal lol

but thank you all for the help! if anyone else has an opinion GIVER!!!