Temp is rarely over 85 where the plants are under the lights. The air moving around is around 70-75 at night it can get down in the 60s. I know it can't be a heat problem. I have a fan blowing on them while the lights are on. Also have a CPU fan 35cfm at top of box for exhuast running 24/7 and a passive intake down at the bottom. I am using CFL's, but I keep them within 1" or so. Not sure of humidity. No I did not flush the soil when I transplanted although I watered them fairly heavy after the transplant as Mr. Cervantes suggested. Also I think the MG perlite has some nutes in it, but a fairly small amount. Its seems to be spreading. I will check them tomorrow to see if it has gotten worse. Thanks everyone for your input.