I'm growing 3 plants. only the one in the middle is having this problem....simple set up nothing crazy why would this be happening? water maybe?
They don't look too bad, keep your eye on any new growth. Its can be hard to tell with seedlings but the usual problems are pH or poor soil.
could be a nitrogen "lock-out" caused by ph or temp. keep them away from any nutes......good water only and an 18/6 regime and I think they will be ok.
I was interested when i read the title... but that was a dissapointment. Flush with water then fix the ph