Worng Fertilizer

It seems to me that the plant does not have a suitable substrate, which should be airy for cannabis, and your substrate looks quite airtight. I have no idea how much you used nutrients, but it seems to be a lot. When the girl is so small (regardless of the actual age of the plant), minimal fertilization is enough, maximum support for the roots and checking the pH, that's all. This plant is too young and weak for heavy fertilization. It also depends a lot on the light, where you place it, whether it has enough air. Aerated textile flower pots, or Airpots, are very good. I would transplant the girl into a more suitable flower pot, change the substrate - so that the roots have enough air, that means mixing coconut fiber and perlite into the soil. I would gently rinse it with clean, settled water, max with natural supplements to lower the pH (if yours is high). Watering cannabis should not be frequent, these plants do not like waterlogging.

Hi friend, I actually think that it is an excess of brightness that is ruining these excellent shoots....remember that too much is not always a good thing😎

You have to watch the info on here as theres several people that havent got a clue what they're talking about and shouldnt be giving people advice.They often sound legit using technical terms to give their nonsense some gred,Iv told them time and time again giving them the correct info and evidnce but they carry on giving bad advice which could ruin peoples grows.They evidently crave the acceptence they get through this forum.Don't flush it.Its clearly not lacking nutrition whatever other people say.The new growth looks fine.Double/triple check all info you're given on here,mine included.

I guess your soil will allready have nutrition in it.Check to see if it has and how long it will feed the plant for.You're better off with organic nutriants when growing with soil.If it doesnt state its organic then its a salt based man made mineral nutriant.Its impossible for anyone to say for sure what is going on with no info and anyone that claims they know shouldnt be listened to.

Not sure what your growing in., you don't have a diary stating your setup. What lights are used and how far away? What's the temperature? What PH is your water? It's not always nutrients causing problems. I've seen many first time growers using soil mediums that require nutrients from the start. Myself, I wouldn't want that challenge without experience but you have to learn somehow. The easiest time to kill a plant is seedling to early veg stages. There could be several reasons this is happening. Most common is overwatering. With my plants I do a thorough PH'd watering of the soil prior to putting germinated seed in. I don't do anything until it is above the soil. Then I only mist the soil around the seedling probably soaking down an inch or two. That's done every other day until the first leaves are out, those single finger ones. Just my way of doing it. At the stage you are now in my grows I would start watering the whole pot. It could be 7-10 days before the next time but that depends on the medium.

Maybe also Nuts lockout, I would flush it & start gentle to add the needed nuttiens step by step

It looks more like a deficency instead of a burn…