Check the underside of the plug and make sure when you see the tap root you plant them in some seed starting soil. Also make sure you don't plant in to big of a pot. I would make sure to not over water them. I see you have some yellowing going on so you might be giving them to much water right now. I am still new also so hope someone that has some better info can help.

I have a grow log to check it out if you get a chance. Hope everything goes good for you. I will keep an eye on your grow.