I have an organic inside grow. Lately I have noticed small, winged, dark insects in the soil. They look like very small gnats. I have not noticed them on any plants. I do not see any effects on the leaves, buds, or stalk. They are in the soil. They are not affids, or spider mites. They leave no residue that I can see anywhere on the plants. The plants are healthy. Most of the remedies I have read here involve spraying the foliage but not applying to the soil. I have used systemic remedies in my house plants but I don't know how this would affect my mj in taste and health concerns. Could these bugs come into my system via locally available composted chicken manure or any of the commercially composted mushrooms or cow manure products? Any suggestions would be greatly appreciated.