This is what I used as well, took about 2-3 wks until I didn't see any though. The first time I ever saw these little bastards(fungus gnat) I took the advice of the dro shop and bought some shit called caterpiller killer in a tiny green bottle, then I learned about Ivory soap getting the larvae washed out bout the same, it did the next time I got them. If I remember correctly, I think the little pecker gnats are A-sex so they all lay many eggs in soil, larvae hatches and goes staight to snack n' on your root hairs. I cant remember the amount of soap per gal(I'll re-post if I find it) but try it and the strips together. Should wipe them out.