Hey bro! 👋
This is a sign of a deficiency or constant overwatering of the plant! It seems like you overwatered it or there's a problem with high temperatures, where moisture evaporates very quickly from the pot and the plant doesn't have time to eat or drink! It looks hungry, that's what I think!
There's not much information without a diary, but I recommend first figuring out the pH for your hydroponic substrate! Watering should have been done at 5.5-5.6 pH for such a young age as your plant! 👆
Good luck, brother! ✊😇