Give her a good flush with water, wait a few days then add nutes back. It looks like she's getting locked out of nutes. Also how are your roots? Are you root bound?
I thought the same thing when I looked at the first picture
because of the color
but when I looked at the second pic I realized the first pic the led lights are on
looking at the second pic alone
the leaves aren't super dark green and actually show some mild purple in the center
that and the leaf margins are curling up like a canoe = magnesium def
I could be wrong, it could be magnesium lock out
if you want to play it safe
water with plain water and 1/4 tsp Epsom salt
if the fan leaves start to yellow give nutes
but I honestly think it might be hungry looking at only the second pic
no argument, like I said I could be wrong