Shore fly
greenhouses, adults feed on algae and their larvae on algae and decaying organic matter on planting substrate. Growers consider shore flies to be mostly a nuisance [...] stages of shore fly feed primarily on microscopic algae, bacteria and other unicellular organisms, they do not cause any direct damage to plant production [...] close to breeding sites. They breed in algae growing on soil, pots, benches, and other surfaces and the female disperses her tiny (0.1 mm) eggs on the surface