I know this might be far-fetched, but i notice in my room that some of my plants that take the brunt of my occilating fans get "burnt" leaves. They start dry out and fall off. The plant's dont seem to bothered by it, except for the leaves that fall off. I lose maybe a leaf every 4 to 6 days but they keep growing. I have my fans to the lowest setting possible. My question is could this be wind burn or a nute deficiency?