Unfortunately, I have quite a lot of experience with this plague: thrips. I almost developed better eyesight looking for them, lol. They will puncture your leaves and leave small trails of bug poop everywhere. When they reach adulthood, they will be able to fly and infect more plants in your grow room. I battled them for one year without being able to kill all of them. They kept coming back. And that's because they will go down in the soil to pupate, then go back up. I used everything available with no results, but (im not marketing them... trust me. Im just a regular grower.) the only thing that worked for me was misting my plants over/under the leaves with Greendel pyrethrum, then watering the soil with pyrethrum aswell to get all the bugs killed. Then I used some diatomaceous earth near the stem to prevent them from going up. This is the only thing that worked for me. My plants look green and healthy again.