Hello, im a first time grower. I've read tons of things but i obviously lack of pratical esperienze.

The problem: dry leaves and brown spot.

4 seeds of norther light auto from royalqueenseeds.

11l pots, biobizz allmix with a top layer (5-7cm) of biobizz light mix for a safe germination.

I ph down tap water to 6.3 (from 8).

Usually water around the seedling when Its almost dry.

600W led lights (600w with a Real consumption of 240) niello dual optical lens at 40cm/15,74 inches.

Temperature around 21-25C° humidity 50-70 (if it measures correctly).

Small fan pointing to the center of the plants.
Seeds were put directly in the pot on the first october, they came out of the soil after 3 and a half days and this is the situation on the 13/10
Thanks for any advice