Look, don't use just any soil mix. I speak absolutely from experience and when you buy cheap crap you'll almost always have problems...I didn't wanna listen to this at first but then my plants started to have huge problems I switched soils and the problems immeadiately began to reside. I strongly recommend Fox Farm Ocean Forest. This soil has perlite in it already and you won't even need to fert your plants for 3-4 weeks. You can order it on-line or find a Hydroponics store near you that sells it (you can go to the Fox Farm website to find a place near you that sells it)
