The humidifier will prevent the plant from using water and transpiring. I would not use it after a plant gets hardened off.

It looks ok to me. But, fill out the troubleshooting form so we know all the info. It is possible that the water is settled to the bottom and the roots are not down there because it is too wet. But at the same time the top could be dry. I see almost N toxicity in the dark green but don't know your setup.