Leaves are turning lighter green starting from the stem up to the tip. Its a Mexican Red Hair Sativa Auto Fem. Nute is Megacrop Part 1, 4grams per gallon of water, drain to waste 20% Daily water and ferts. Media is Dr Bugbees lab soil blend 50% Peat 50% Vermlucite, with 2 bricks of Buffered Coco coir added. Light schedule is 20 on 4 off.
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I’d slurry test your media to check Ph other than that it just looks like new growth to me. Maybe get some microbes running around in your media.
As my boy Scotty would say “Hit them with some Recharge”
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New growth is normally a lighter color than older growth. It is hard to tell with that picture but it looks like some of the new growth is turning white which if this is the case your lights are to close to the plants and should be raised up a little as lights to close will cause “bleaching” and if left close can burn the tops.
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Is this on new growth only? If so I agree with @Oldjoints , that is just new growth that hasn’t photosynthesized yet. If it starts green, and then progresses to lighter, that might be an issue
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Yes its only on the new leaves.
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Light is about 36inches away at 100% Mars Hydro 150w Ts 1000
Already have Micorobes running planted with 2 different brands of mycorrhizae
That is far enough away so you are good!
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I googled it and all i could find is lack of nitrogen, but it gets 4g of mega crop in a gallon of water per day so i highly doubt its lacking nitrogen. Its my first grow so I guess im likely just gonna freak over everything till harvest. But I cant really afford to go buy more seeds if I screw something up so im extra worried about this plant.
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Its just new growth. If your in the UK and strapped for cash I can send you some seed to grow.
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From what I am seeing in your pics everything you are doing is working and your plant is looking good.
With that said all you need is some 
(The picture is a link and will take you to the LITFA thread)
check out post # 17 by @Albannach
Your plant is looking good and it is normal to be worried about it but just sit back and relax…
All is good brother 
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As I said new growth will naturally be lighter than old growth.’Your plant looks healthy and happy, just keep doing what you are doing and don’t try anything drastic.
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Thanks man, but im in the US.
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roflmao point taken brother, will carry one business as usual
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Hit me in the DMs i can get you a few seeds. All fem all auto. Make sure you have something to play with.
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This is why I 
the OG.
So much 
here
@Ace71975 when you have a free moment check out the official OG introduce yourself post. Read a few of the post and then drop a post about yourself…
It would also recommended dropping a pic in your 1st intro post as I can guarantee OG loves cannaporn. Doesn’t have to be a pro quality pic just a pic. As a matter of fact I am sure a nice pic of your Mexican Red Hair Sativa Auto Fem in its entirety would be a great pic…
ya over there!
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I DMed you thank you so much for the offer
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I use Megacrop 1 part in coco. If the light color isn’t from just being new growth, every once in a while it can be from an iron deficiency. Seems to happen when a plant grows really quickly. I have iron, so I use it, but I’ve had plants just grow out of it too, with no help. You plant looks fine to me.
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Inspect them under magnification
Just for shits and giggles.
Good luck