Dank weed for the soul

One of my plants has a few leathery leaves on the top, i'm wondering if I should do regular water for the next two watering's, or maybe the humidifier is too close? I have been adding cal-mag but it seems to always give my plants dark leaves, I think I'm going to leave that out next watering. The weird looking critical Kush is actually making a comeback. Don't be alarmed by the dry soil, its watering day and for some reason, the top of the soil never soaks in water.