canoeing

the past 2 weeks they've been getting worse. Temps stayed in the mid 80's, that's what I keep them at under LED's. Switched to plastic pots since air pots seem to get them root bound (maybe I'm overwatering?), using biocanna at 1/4 strength. Lights are 18" above canopy. Only 3 out of the 6 are...

My leaves are yellowing and and canoeing under maybe too much light or too much nitrogen please any advice will be appreciated