you may want to lower temp to like 75F or like 23.5C that would be optimal and the brown on the leaves will never turn green so dont worry. The new growth should come in green and then that little brown spot will hardly matter. The plant can really never have too much light but the heat from the light should be a concern. Never have a fan blow directly on your seedling, it will stress the fragile plant. Just keep the light about 8 to 12" if its a florescent and if its HPS or MH then keep it like 3 or 4 feet away. They are much too intense for the little seedlings. Keep them watered but not soggy and keep dont really use any nuts until you see nice pointy leaves in about the second week. Then use a 25% to 50% of what they tell you. keep it less than 500ppm but 400ppm is pretty good. If you keep up the good habits, it will grow. They dont call it weed for nothing lol.:rastasmoke: