Answer: It sounds like you have fungus gnats in the plants. These can be treated with insecticidal soap or with Gnatrol used as a soil drench according to the label instructions. They breed in soil that is always moist, so it may be that you are overwatering your plants somewhat. The surface should be allowed to dry out between watering. Another tip is to sprinkle a layer of sand or gravel atop the potting soil. This layer drains fast and will quickly become completely dry thus making an inhospitable environment for the gnats.
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