Fungus gnats (Sciarids), also called dark-winged fungus gnats, are small, dark, delicate-looking flies that infest soil, potting mixes, container media and sources of organic decomposition.. Adult fungus gnats have light gray to clear wings and slender legs with segmented antennae that are longer than their head. Females lay tiny eggs in moist organic debris or potting soil.
Shore fly
Shore flies (Ephydridae) are minute flies ranging from black to gray in color, that prefer moist environments. Adults and larvae feed on algae and decaying organic matter in planting substrate.