Yellow Borders and Curling inwards slightly?

You have nitrogen toxicity, and a watering amount issue. Picking up the potter is a good way to tell how much water is in it. Also if over watering is issue adding more perlite or coco coir in top layer of soil mix can help with resistance to issues. Good luck and happy growing 🌱

Yeh I would be tempted to agree with hashy. I would lay off the water for a few days. If you are using soil (i didn’t look at your medium) I used to just stick my finger in the soil at the top of the pot. If it felt wet I would water, if not I wouldn’t. It took me a while when I first started growing to learn not to over water. It happens way less in coco which is part of the reason I switched. I also now use autopots which are really useful for watering or if you don’t want to spend the money (understandable) just google hempy bucket and make one of them. Just make sure you don’t constantly top the water in the bottom up and it relies on the plant going through a full wet/dry cycle.

Your leaves look heavy from water. You could be watering to much or to frequently.