New grower please helpppp

What size is the pot you’re using, and are you aware of how much water you’re giving? It’s possible that you’re overwatering. Especially during the seedling stage, the plants need very little water since their root system is still underdeveloped. I would suggest monitoring the situation for now and seeing how the next set of leaves develops. Good luck and happy growing Buddy.

not enough info.. if it's an inert substrate, you need to be fertilizing from the start. if soil, it would normally be too soon for any deficiencies to show. based on drying pattern looks like your watering habits need to be adjusted. the pot looks a bit large for the size of plant, but not so bad i wouldn't water in an orthodox way. 1) fully saturate (if soilless, 10% runoff minimum, too) 2) wait for appropriate dryback and repeat. Don't complicate it more than that. How long you wait can be a bit variable, but you want a decent wet-dry cycle for the sake of your root zone. If you wait for the same amount of dryback or weight loss, itwill require the same volume of water to get the job done. So, you use a volume that is sufficient. You learn that volume in hindsight. As with time between irrigations, you don't choose these things. The context dictates. That's when you know you are doing it right.

it's normal, some cannabis species have light green leaves instead of dark green