I use Fox Farm Ocean Forest Soil with Fox Farm Organic Big Bloom at the rate of 1/2 cup per gallon of water every other watering. Shes been on 12/12 for almost three weeks and everyday when the lights come on more of my leafs look like this. Mainly black in the center, or brown, and more greenish yellow around the edges. My worry is that the upper leafs are starting to do this. Any help would be much appriciated. Merry Christmas to all.Its a Fem purpple haze plant if that helps