Tangie is no longer a seedling, and now beginning vegetation. From the seed info, I suspect this stage will only last 2-3 weeks before flowering. I have not yet added any nutrients because of the rich soil. I upped the intensity of the light to 75%, which is what the manufacturer recommends for vegetative phase. I dropped humidity down 5% this week to 65rh. I also added a USB powered CO2 monitor, which revealed my PPM was too high at about 1300. To bring CO2 level below 1000, I increased the speed of my intake fan - I love easy fixes.π