m0useanswered grow question a year ago They are fungus gnats.
BTi works great, I also love beneficial nematodes. one application and they are gone within a week.
Product I used is called pot popers. I break open the tea bag and sprinkel the little pods on the medium of the plants I want to incoulate. The adults will die off easy enough from fans and lights. Sticky traps are not a good solution for eliminating them, but do work wonders as a monitoring tool to see if any are getting in to you grow.
Good Luck!