Answer: If the tips of the leaves are turning brown I'd suspect fertilizer burn or lack of humidity. I fertilize my seedlings every time I water, using a quarter-strength dilution of liquid fertilizer in place of plain water. This method provides a constant source of nutrients without the potential for overloading the soil and burning the plants. If you're using regular incandenscent lights, the bulbs may be too close to the plants, excessively drying the air and radiating too much heat. The affected leaves may or may not fall off. Either way, it shouldn't cause problems with your peppers and tomatoes. Young, vigorous plants will replace lost leaves.
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