@mr_weeds_autos
Thanks man! It's hydro, so water isn't it. I turned the light to 30-40% (from 20%), 2 days before the wrinkles started. So it's probably Humidity. I'm gonna power up the humidifier. I wanted to try a grow without it, since I heard some people say you don't really need it. Atm my Humidity is around 30-40%. Never went below 30.