maybe some P needed. petioles are redder than normal even for LED grow, but could be light in picture or my horrid eyes. If anything is going on, i'd wait and see... don't jump the gun.
if you have been gassing it lately, give an extra water only irrigation than normal.
Hello friend,
The white lines around the sides says Cal deficiency.
Either raise your pH but will get lighter green leaves, or drop and add couple drops of fresh lemon with cal-mag 1ml /2 litter of water.