These burnt patched have developed over a matter of 2-3 days. Here are some pics of a couple plants showing some leaf spotting, almost looks like the leaves have chicken pox. Most of the plants are doing fine, but its only after i fed them some MG bloom booster flower food(15-30-15)that 4-5 plants have developed these yellowish/brownish spots on its leaves, and upward leaf curling, and seems like its spreading to the rest of the plants. This morning I also noticed these small slow moving dark flies flying around the plants(some sort of gnat?)...could it be that the gnat droppings are causing these burn patches on the leaves? Any help would be appreciated thanks....