Hi there! Your plants started out great! I'm not a pro but from what I know, I would say that things went 'bad' from week 3 to 4 and became worse. Is it possible that you did not let the soil dry out before watering? If so, you're overwatering them. What might have happened is that the roots might have suffocated a bit due to too much water. Yes there is a bit of nute burn but I really doubt your plants are feeling like that because of nute burn cause it's really mild. Good luck bro!
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