I had the same problem. I co2 the crap out of the place 4 times over 3 days and it stopped. It also helped muh plants. But I also had the same problem on a tomatilla or however you spell it.. Noticed that they were coming from the ground.. My grow inside was affected by my outdoor grow.
But relax. There are many things you can do about this. But start with a dandelion spray. Dandelions have remarkable bug removing properties. Simply pick some, boil them (stem, leaves, everything) in a hot kettle with very little water, drain water into a spray bottle after its cooled down. Spray your plants....