I've been growing these plants for about 1 week, maybe a week and a half. for the past few days they have been growing slower than usual. and with one of them the tips have started to curl slightly. I'll post pics, and their are a few slight yellowish spots. I use 2 2150 lummen bulbs, water usually once every day at the end of the day, 20hrs of light, 4 of dark. id like to make my babies growth explode in a fast amount of time. any advice on my slow growth, yellowish spots, and tips curling?