Second week is starting very bad. I just noticed t...

I wouldn't do anything.Soil not looking overwatered.It's looks a lot like a genetic thing to me.If there was a problem those cotyledon parts would show it immediately.I think youre going well,let the thing go

I wouldn't most soil has enough nutrients already for seedlings in the first 2 weeks. You have root problem. Overwatered cannabis plants are droopy with leaves that curl down. As a result of overwatering, leaves often turn yellow or show other signs of nutrient deficiencies (especially when it comes to younger plants and seedlings!) Overwatering does not always mean you’ve been giving the plant too much water. It can also mean that you’ve been giving the plant water too often, or growing plants in a growing medium that holds onto water without enough air, or doesn’t have good drainage out the bottom.