okay guys 6 plants 21/2 weeks old 4" pots. 1/2 perlite 1/2 peat moss. under 2 65w cfl one blue one red. water ph is about 6.5-7 soil ph is same. i had a humidafiar in there for 2-3 days and thats when i noticed this. so i took it out its been out 2 days and hey are getting worst. i waterd with 1/2 strength 24-8-16 today and yesterday. now the roots have started to grow threw the bottom drainage holes i can just barely see them. if you need to know anything please ask. i need to save these guys. ((o man i need a joint)) they've been so well untill now. there my babies come on. thanks. i took shots in different light to show the major yellowing and black spots... they look even worst in person

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looks like nitrogen burn or a p deficency

well can it be nitro burn if i didnt started giving them any until this happen

mine are also 2 weeks old and alot healthyer and bigger than yours and i still havnt used nutes..
i think nutes is your problem,, im sure it is m8

what soil u use??

have u got drainage at the bottom of them pots?

There is a whole forum section with all the facts and info you need to diagnose plant problems. I have used it several times to answer my own prolems. check there first next time before you get frantic and start a whole new thread!! Other than that give it straight water for a day or two it looks like nute burn

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okay well i couldnt find anything in that forum except for mosture stress thats why i took out the humidafiar. and yes i have drainage holes and i have only used nuts once. the promblem started a few days before i ever used nutes. jjust straight water. my soil is 1/2 perlite 1/2 peatmoss

i thout nute burn too but he didnt add nutes unlil the problem started.. so either using pre-fert soil or by the looks ov it its a phosprate deficency (sorry if i spelled that wrong) ,made worse by added nutes...also 50% perlite mix never worked too good for me

yes it defo looks like PHOSPHORUS def.. read in plant problems.. it says got a plant problem check here first)