advice from rusty n' stinky will mos def serve you right. the shit i have learned from reading there posts is priceless.

I agree that at first it looks like overwatering, I had and have a similar problem. around the six week of flower my plants take a serious turn towards death. At first I thought it was normal which it kinda is. However, my grow space is a small concrete crawl space with one bathroom fan bringing in air from outside. At first I was growing just a plant or two, now that I am growing between 5-6 plants my problem is a bit worse. leaves start to curl down, yellow/browning of leaves, crispy deadness sort of texture. I figured the problem was now I have 5 or 6 plants fighting for the same air that was seemingly barely enough for 2. Unfortunately i can't add more air intake without getting completely obvious, so I will just grow around 4 or so plants and open up the door a couple times a day to give more fresh air (and releave the heat) and just deal with it until I can get a bigger space.

Also I don't know the scientific facts on this but I figure the bigger the buds get, the more air your plant need. So the air that was sufficient when they were just starting to produce will not neccessarily be sufficient when they are fullgrown women. Does anyone concur?