Nitrogen toxicity? Deficiency? Something else? Stumped!

Hey I replied to your DM, but all the notifications are broken hopefully you see this. Good Luck!

Congratulation! You have perfectly healthy plants! The yellow leafs got not enough light. Thats all. Happy growing!😎

I would say it is in the beginning of it yes. I can see some N clawing on some of the upper growth in the mature leaves, When the tips point down are the leaf if dark green its a sure sign. Just ease up on the N and it will correct its self on the new growth. Older leaves that are dark green will become more brittle and may fade in vigour........ I do not see your feeds listed in the diary, but if they are the same as your last diary then Fox Farms feeds them on the heavy side, Best to use a TSD Pen or equivalent to determine if they are getting the right concentration. Also good to note with liquid nutrients its good to get min 10% runoff of the pots volume to prevent a buildup that could cause more issues down the road..........Best Of Luck!