We just started flowering in the closet about a week ago, switching from 400w MH to 400w HPS, 12 on 12 off. I have identified 3 of the plants as female, 2 as male. They have recently developed a strange problem in the lowest leaves. Certain small areas have turned kind of greenish brown and wilted in larger areas. Before long they become dry, crisp, and brittle. It also seems like it may be carrying over from one leaf to another where they touch. I tried clipping off the infected leaves, but more just get infected. I am worried that it will spread to the buds before they can be harvested! This could be unrelated, but it may be important. During finals, I neglected watering the plants for a couple of days and while I was at school they all (5) wilted down pretty badly. They went from like a 120 degree upreaching angle to a very acute 30 degrees or so. I immediately watered them and they perked back up within a few hours, but I think that may be about the time the problem started. Usually I water because one of the plants starts to wilt downward a little and I check its soil and it is mostly dry, but still somewhat damp at the bottom. I usually water anyway since I don't want the plant to wilt down any more. Am I overwatering? Are there any other possible explanations?