Ok this is my first time growing. I am growing Haze x skunk 1 under a digital switchable hps/mh 250w 24 hours of light. they are just over 3 weeks old and the leaves are curling up word and I am starting to get a yellow spot on one of my plants. I have not yet started to use any fertlizer yet cause I am not sure when to start cause I am using miracle grow soil I thought it would be a good soil but I have been told otherwise but I do not know. Thanks for your help