Yes.
Yes.
Try drying it out some, if necessary replace soil. Sounds like fungus gnats from overwatering
Fungus gnats can be a nuisance to some people. They can be eliminated by the use of a common insect repellent.
Maybe
Spider plants themselves do not produce gnats. However, the moist soil and high humidity that spider plants thrive in can attract fungus gnats, which are small flying insects that feed on organic matter in the soil. Proper watering practices and good plant care can help prevent fungus gnats from becoming a problem.
They are just fungus gnats from over watering. Set it outside & dry it out some & they will disappear.
Bugs that attack cilantro plants are fungus gnats.
Vinegar won't get rid of them, only trap some adults keeping them down. If you have small flies breeding indoors it is keyed to moisture- leak in a wall, overwatered plants, drains, etc. Find that source and dry it out and they will die out. If it's fungus gnats from a plant, Take it outside.
No, gnat infestations generally do not kill indoor apple tree saplings. They are just fungus gnats from the soil as a result of overwatering. Cutting back on watering amounts and times should make the fungus gnats die off.
Yes, there is an insect that controls fungus gnat larvae. The insect in question is the rove beetle (Athleta cariaria). The rove beetle also preys upon the egg and pupal stages of fungus gnats.
Those insects are likely early instar fungus gnats. They are small, black, and tend to gather in swarms resembling a dark moldy patch. Fungus gnats are attracted to fungi and decaying organic matter, which is why they might be mistaken for mold when they swarm.