i misted them with plain water for their entire veg cycle and no brown spots. when i changed the light i changed to sparkling with co2 no brown spots until 'bout a week ago the top brown spots may be just heat spots from the 2 cfls i have up there. the spots on the bottom almost look dark greenish, black and they are only on the leaves that are dying off it almost looks like the green is sucked into the dots =green to yellowish-to dotted to dried. any good links to what and why to foliar feed