Bugs!!

Very easy to avoid since they need they soil surface for laying eggs. Best solution is to cover the top of the soil with a layer of something that reduces access to the soil, it can be LECA, perlite, etc but the best is Diatomaceous Earth since its microscopic jagged edges rips open insect carapace, it's what old school kitty litter is made from but most kitty litter contains perfume so it's best to acquire the Diatomaceous Earth from someone working in mechanics or similar where the pure Diatomaceous Earth is used to clean up oil spills, I bought a bag from a plumbers' wholesaler a while back.

I mix apple vinegar with water and add one!!!! drop of dish soap. It attracts them, and thanks to the dish soap, they drown in it immediately.

Bti - use it preemptively whether you have a problem or not, then you never have a gnat problem... Can stop using it 2-3 weeks after getting the medium wet -- that timer resets with any transplant (new medium added) in north america the common brand is "Mosquito Bits" or "Mosquito Dunks" - whether you top dress or pit some in a reservoir matter of choice. it's a bacterica that kills the larva. It or a variation of it has been used on food crops for 100+ years? A very long time. It's safe. Bacillus thuringenisis (israelis subspecies) -- i probably spelled that wrong. Google can fix the spelling. Doesn't have to be 'mosquito bits' brand. This stuff often comes from the store in the soil... nothing you can really do about that. Find a store that doesn't put stock outside, but even then it can get infested during transportation to that store. If you use it mid-infestation rather than from day 1, it will take 2-3 weeks to clear up the problem. Adult gnats are annoying and obviously reproduce, but they aren't the stage of life that is damaging your plants.. the larva eat the roots. Midinfestation - kill with bti and sticky traps... kill from both ends of life cycle. If you use it from day 1, it'll kill anything before it starts... if you don't see gnats after ~3-4 weeks, you can cease using the BTI. If you had an infestation, i'd continue to use it until the end of the grow as that is a different set of circumstances. gnats can be avoided ~100% ... and it's cheap to do so.

I prefer prevention over treatment. Good airflow, sticky traps to monitor flying pests, and keeping the soil from staying too wet can make a big difference. For fungus gnats, beneficial nematodes (Steinernema feltiae) are a great natural option. No harsh chemicals, just a clean and healthy grow!

Hi Bud... Sprinkle some cinnamon around the surface of the soil and water in Cinnamon will kill the fungus that the gnats feed on and they will starve. 1/2 tsp for solo cups and 2 tbs for larger pots like 3 to 5 gallon pots. It won't hurt the plant unless you use way too much. Give it a few days to work. Fungus Gnats are a sign of not letting your pots dry out enough between waterings. Try Lavender essential oil for the flies... Mix 10 to 15 drops of it to about 16 floz. of water in a spray bottle and spray around the house and your tent. Won't hurt your plant if it's sprayed a bit. Repeat when the smell is gone, so you can spray up to 6 times a day. If you have a lot of fruit flies in the house, they are living off something in the house. Check that your compost buckets are sealed and there is no soft or going bad fruit around the house, or anything that they can get substance from. There you go 2 natural solutions for you. Good Luck.