Please Help my plants keep getting these spots then the leafs turn white or they Dry up and Die! I keep taking all the nasty dead leafs off but a few days later i see this starting all again its been like this for a month! i change the pots to a bigger container I Have 7 Plants! this are ok! and 2 Large ones the this are bad! I started with Foxfarm Dirt in 10/3/09 Grow Big (Fox farm nutes) I use R/O Water with Cal Mag I have 2 Fans I use A/C Room temps is at 76 day 60 Night Humidity 45 My whole room is PANDA FILM with fresh air threw filter! Why is this happening everytime i clean off all the leafs they start again! I had thrips when they were smaller is it a thrip dieses? its not heat stress! I need Help ! Please! P.S I Dont have any thrips Anymore!