your not getting enough n. try also adding some kelp and cal mag, water very lightly, your plant will bounce back but you really need to baby it, check your ph levels at the bottom as well, looks also like your ph is off , so to fix grab some kelp and grab cal mag, up your feed of nitrogen just by a little. for now let the soil dry a bit, when you water use just the cal mag and kelp , kelp helps plants rebound and cal mag helps the plant put its growth in a happy place