Can someone help me diagnose?

Hello guys, this gelato is about 3 weeks old. Its my first time growing and i did some mistakes like having too much heat but it happened once and then fixed the problem right away. However since that day the edges of the first leaves started wilting and then the second set but it didn’t go further. Then after that, discolouration started appearing on the first set of leaves. I didn’t notice discolouration anywhere else but now i can see that new growth has a lighter colour too, im not sure if thats natural? Also i noticed the leaves pointing slightly down after every time i water it, and i wait until the soil is dry more than an inch deep. Then overnight they go back up.

I didnt give any nutrients as im not sure whats happening. Heres the soil information and a pic of the plant.

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