Not sure if this is nitrogen toxicity or normal leaf color. Crinkling was caused by too much light and the fan. Got better in 24h after adjusting grow light and fan. Plants are starting week 2 of veg, Hulkberry Auto. Medium is light mix soil.
Nitrogen toxicity is dark green. Shiney, leathery, clawing down leaves are all signs it can show. The shade of green in the plant tells you how much nitrogen is in the plant. The spotting on the darker green one might be from a strong feeding or was why you feed. Could be water left on leaves under light. Anyway they look alright. All but the 1 darker green plant would be a ideal shade of green to maintain.