also i heard apple cider vinagar works too anybody know
No, it won't help. And it's strongly acidic, like "pH down."

I did try diatomaceous earth toward the end of a grow, and it did seem to help. Not sure what'd be like dealing with it long term, though. It tended to form a crust on top, AND get washed into, the medium (I was using coco).

No-pest strips work, too. Turn off your ventilation and hang one in there over your night cycle. Store it in a zip-lock between uses. :thumbsup:

Try the advanced search function -- we've discussed this a lot already. ("Fungus gnats")