I have some seedlings that are experiencing some problems. There are about 7 I planted in coco-coir on July 1st, and ~4.5 days ago i noticed the leaves crisping up on 4 of them. I was away from town so I instructed my roommate to lightly moisten them, but not as to over water them. When i got home yesterday i noticed they hadn't improved and maybe gotten a bit worse. They were on 24/0 so i switched them to 18/6 and raised the lights and moved the plants away to relieve stress. No nutrients so far, ive been watering enough to keep the medium moise, although I will let them dry out in hopes that maybe over watering may have been part of the problem? i have 5" pots ready to go so im also wondering if its time for a transplant. Have em under 2 (6500k) 100W equivalent cfl bulbs. The straws were there for support, been using a fan on and off. If you cant see in the pictures the leaves are still green in a lot of areas, yet dry and crispy.
Did you rinse the salts of the coco...? also spray 2x times a day with clean water...but washing the coco is the best way