Well I had the same problem plus the browning of leaf tips. I don't know if it might be the same thing and unless youpost pics its hard to tell. But the soil i was using had caused problems (dang mg working for everyone but me lol). I went out and got some Fox Farm Ocean Forest and replanted them in there after rinsing off the roots and everything and they have done a complete 180. Well hopefully you figure it out! Good luck and good growing man.