The soil is too dry! The soil is too compacted! You're not watering it enough!
Before watering with nutrients, try to follow the rule that you shouldn't water nutrients into completely dry soil! If the soil is dry, first take water with the right pH and lightly moisten it....wait 5 minutes and then apply a standard watering with nutrients on top.
At this age, it already wants to drink about 500 milliliters of liquid a day! And you're giving it, judging by your diary, 20 milliliters of water! That's nothing for a plant even during germination! That's way too little liquid! 👆
Good luck, friend! ✊😇