I have the same and I am not sure what to use on them. They are tiny black gnat looking flys. Looks like it's coming from the soil. They do fly. I have an indoor setup and also I got some mushrooms growing in the soil. I pulled them out. Don't know how that happened. This soil that I used was gurranteed to be bug free, the brand is (Kellog - Patio Plus indoor and outdoor potting soil). Is this stuff ok to use. I have been using it for 30 days now.