Help! Yellowing and dying leaves!

New grower… What is happening?? She was so green and happy the other day and now have yellowing/dying leaves! Tried looking at other forums and I can’t find anything that looks really similar. I read yellow leaves die off and happen but this seems excessive. Normal? Not enough nutes? Send help :frowning_face:

Harlequin in FF OF soil feeding FF nutes

Looks like nitrogen deficiency. Is it just yellow? No rust spots? How old are your plants? How far are your lights?.. just wondering because of the shape/length of your plant. Maybe your lights are too far… plant is stretching…. Eating lots of nitrogen. Just a guess.