Quote Originally Posted by Gone-Phishing
Just a suggestion but did you check out your roots because 3L planters seem a bit small for those tall plants, possibly some root lock going on their.
I agree with gone-phishing. You need bigger pots. The leaves look light green in the pic so im assuming they need nitrogen. The brown spots look like mag def to me. Since you are feeding nutes this means the plant is not taking any in. So I assume lockout. Transplant into bigger pots with fresh soil and i believe youll see a big difference within a week. Make sure your ph is around 6.5ish and you should be good to go. Good luck