anyway, tell us more about it. What soil? What are you watering with? Did you happen to maybe get water on the leaf during a feeding? This would burn the leaf. However, your situation looks more like a deficiency or burn from a chemical.
Its about 10 days old I water it with tap water, the dirt is old miracle gro from a bunch of potted plants I mixed up, and there's a 26w cfl in a reptile lamp right above it.
