Anybody know what's up with the leaves

Led grow 18 hours light veg
Day temp 80-82f
Night temp 77f
Humdiy 60-70%
Growing in Coco
using canna coco nutrients
Ph 5.8/6.0
Tap water thats 0.2e.c I add canna calmag agent to bring that tap water to 0.4e.c every watering then add my feed they where on 1.2e.c total then I tried 1.4e.c for 2 feeds then 1.0e.c for 2 feeds, I got a feeling it's either humidity or maybe something to do with my feed and calmag

Growth has been very slow and root growth slow and drinking slow, and the seem very compact seems a bit to compact hard to explain lol, not growing in hight much

Pics below