Problem On the Leafs of My Stealth Hydro Kit

Hey, I have a stealth Hydro kit going right now in a closet. Using Just some different wattage day-light CFLS. I'm about 3 weeks into grow and one of my plants has either some burn or something else on it's leaves.(see picture) The thing that boggles my mind is that it's only on one of the 6 plants, so it couldn't be nutrient burn if all plants are drinking the same water and not being affected. (could it?) I've been very careful with my nute dosages anyhow. But the problem has persisted for about the past week and a half. It couldn't be light burn either because the CFL's are pretty cool and they are a safe distance from them. Any ideas for help would be great!
 

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