First grow:4wks and yellowing leaves :( please guide me

I am a very keen to learn noob 4 weeks into my first grow. I decided to go with barneys vanilla kush seeds and use a 600w light in my 1x1 tent plant setup. They started off perfectly and I was really proud of them but over the last couple of weeks 2 out of my 4 plants have gone from perfect green...to light green....to slightly yellow.. And now yellow fan leaves with brown spots appearing. I use canna coco and have purchased many nutrients... For veg stage i have canna coco A&B, but have recently purchased canna rhizotonic as I was told it might help them a bit?? The new growth is coming through but although it starts green it turns yellow after a couple of days and as a first time grower this is literally like watching a child screaming out for help but not being able to know what it needs. I have tried flushing... Under feeding, Adjusting the light height and creating more air flow but no luck I'm getting that comforting green look back into my kush plants please someone help me? I will be more than happy to upload pics if someone is patient enough to kindly guide me through this website. p.s I was considering including some bat guano in my next feed as it could be a nitrogen deficiency that is being stubborn.... Thanks for your help everyone. Joe

pictures plz ..........

Clones I am on iPad which doesn't allow me to upload onto this website...I know this is probably going to annoy you but I'm so agitated as I have tried so hard and really enjoy watching it grow and it's getting more yellow day by day. Is there any other way I an get pics to you? I would really appreciate your help. Email.... Anything?

Without pics mate it;s impossible to be 100% sure, but sounds like a nitrogen deficiency. Rhizotonic is really good, but it's not a feed. It can help promote healthy roots and it's good for a plant in shock, gives it a nice calming affect, sort of valium for plants.

What ec are you feeding them with?

Brokerj said:

Clones I am on iPad which doesn't allow me to upload onto this website...I know this is probably going to annoy you but I'm so agitated as I have tried so hard and really enjoy watching it grow and it's getting more yellow day by day. Is there any other way I an get pics to you? I would really appreciate your help. Email.... Anything?

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ok , i will try and help you , send the pictures to earthdream@hotmail.co.uk and i will upload them for you , and no your not annoying , glad to help if i can ....

Sensi, thank you for your post and yes I can see how it's hard without the photos (sad face) but from looking it seems lots of other people have the same problem with the iPad. I it's not so good after all!! I was thinking that maybe I should get some bat guano and mix with some ph balanced water kinda like a guano tea to boost nitrogen levels? I wouldn't be so confused if it had affected all of the plants... But one out of the 4 seems to be going perfectly... The others look nicely stood up looking proud with their leaves up but so light green and yellow it's upsetting...I have really enjoyed the grow so far and find it really interesting..I just can't put a pulse on what is causing it exactly. Possible I could send you some pics on email for diagnostic? Words can not describe how grateful I would be for your help

Bat guano supposed to be really good mate. Light green and then yellowing definitely sounds like a lack of nitrogen to me. Does the yellowing start from the bottom up?

Sending now earth dream. Thank you loads

It's kinda all over now sensi... New green starts green then does the same thing. Very frustrating mate

Give them some Nitrogen mate, but take things slowly, it's easier to add nutes than to get them back out. Don't worry to much, they're hardy souls, they'l be fine in no time.

I think clonex is uploading the pics for me now.... Let's hope this helps with someone's advice.... I know they are only plants but I am a massive stoner and to see such an amazing plant die sucks massively

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Thankyouuuu clonex now.... I play the waiting game. What do you think clonex/guys and girls? What could be causing this....

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They just look hungry mate, you'l have those nice and green in no time.

But why the brown spots and the yellowness spreading? I have flushed them a few hours ago .... But the yellow almost brings a tear to my eye.... I hear people use bat poo (guano) these days to increase nitrogen levels.... What would you suggest?

You shouldn't have flushed them mate, they need nutes being added not diluted even more. Yeah bat guano supposed to be very good, or anything with some Nitrogen in it, as that's what your little ladies are crying out for.

You are right.... Maybe I shouldn't of flushed them? I just wasn't sure if I was using too much or too little nutrients as I only put less than one lid full in for a bucket. Do you think I should feed them more? Do I deed them every day? Shall I only keep it a couple more weeks in veg just incase it dies? All these things go through my head all day long since the problem started

They're in coco right? Then you should be feeding them with every watering mate. Like i said, take it easy and build it up slowly. They won't die, once they/ve had a good feeding they will look great again.

Have you tried Hesi nutes mate? It's a one part nutrient and my mate swears by it.

Yeh there in canna coco ... And when you say I should be feeding them i every watering do you mean nutes? I know that coco is just a base for the roots and provides no extra nutrients but I didn't know I was under nuting them? So maybe I should add more than a tiny lid full of nutrients to a bucket? Hmmm....
And I have read the yellow leaves can never repair but I was thinking that because the stem is slightly purple and the leaves are all drying with yellow that it would die .... Could be over exaggerating but I am not sure. Anyway...what schedule would you recommend? I normally do a plastic cup or 2 a day into the full sized pots..2 water at ph 6.2 and then 1 with canna coco a and b??