Clones - curling brown/yellow edges, need a plan - a good one :)

hard24get;2476504 said:

Strain Candyland (Sative-dominant)
# of Plants 50 (5 to 7 affected)
Age 12 Days since we picked up the clones
Grow Type soil
Grow Stage Vegetative
Bucket Size 1 Gallon (transplanted from small cups 3 days ago)
Lights 4 Florescent indoor, sunshine outdoor during the day
Nutrients None yet
Medium Cocoa (Coco Loco - Fox Farms)
PH 6.5 to 7.0
RH About 30% to 50%
Room Temp 70 t0 72 indoors, about the same outdoors (we put the plants outside for a few hours/day
Room Size 10' x 10'
Pests None visible to eye or under microscope

Problem: My leaves are turning brown/yellow along the edges. The new growth is curling up (see photos). When the discoloration began we sprayed the affected plants with a fungicide. Its active ingredient is (quoting the package) "Clarlified Hydrophobic Extract of Neem Oil" So about 10% of the crop has been affected. We would appreciate your thoughts on what our problem is and what we might do to contain it and/or cure it. Thanks.

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