As trustytasty said, you can best help yourself by helping us to know your exact setup by starting a grow journal. It helps to know how big your pots are, what size & kind of light you're using, how far away the light is from the tops of the plants, light schedule, and so forth.
By the looks of those last 2 photos I would say over-watering has occurred. Allow them to dry out about 50%. Don't feed them anything but water after they have dried out some. Are you going to transplant them at some point? Wait until they have recovered.
Good luck to ya.:check:
By the looks of those last 2 photos I would say over-watering has occurred. Allow them to dry out about 50%. Don't feed them anything but water after they have dried out some. Are you going to transplant them at some point? Wait until they have recovered.
Good luck to ya.:check: