I have the same problem (septoria). However, I can't seem to stop it. I've used Bacillus Pumilis (which smells like ass), and neem oil. I have also drenched the entire room with bleach. Yet each day I look more leaves are infected. One plant is looking dire. It has almost no sun leaves left, and still each day more of its leaves are infected. I am about 2 weeks into flowering. Is there any hope? What concentration did you use for your neem oil? I am removing leaves at the first speck of infection is that the right thing to do? Any help would be appreciated. P.S. for the record I am not certain it is not a Ca difficency.