Hi, Miracle Grow isn't the best nute for mmj I ruined my first grow with it. I hope they are next to you a/c unit just for picture taking cause they won't like all the hot air it puts out while running. I have a seedling that's about the same age as yours outside. Cold isn't the only problem the shrinking daylight is too. I am experimenting with my seedling by using a light to trick it into thinking we are still getting 14 hours of sunlight I only need it on for a little more then a hour so I have a timer set on it to turn on a little before sunrise.