I would transplant into some better soil. make sure you give them 1/4 strength miracle grow when feeding.When do you plan on flowering.if soon transplant them into new soil in final containers.If you are using the cheap potting soil that stuff is junk.You would be better off with scott premium. It has nutes in it , but it has never killed or made a plant sick when i was using it. Also i see you used some peat pellets to start seedlings. they are fine, but here is a tip i have learn works well when using them. When you get them swelled up.Before placing seed in them .take a razor blade and slice the bottom open.Then place them into a party cup with soil in it. This will allow the roots to expand properly without having to work and force there way through thet mess stuff. I have noticed plant progress fasterthis way. By the way do you know your soil ph? how often and how much are you feeding them? Scotts premium soil is buffered for ph.It would get you through flowering with no problems.