Answer: As long as the plants seem healthy I would not worry too much about a small amount of greenish growth on the surface of the soil. Very young seedlings may succumb to damping off and in that case mold may be a concern. This may occur due to the seedlings being too moist, overfertilizing, lack of air circulation, temperatures that are too high or too low, or simply as a result of something in the soil mix -- or even spores from the basement. Always start with clean tools and equipment and a relatively sterile soil mix. Your plants need light for 14 to 16 hours a day, and should be kept close to the bulbs, within just a few inches.
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