Why do you got fungus gnats?
I found that for some reason when ever i start a pot with happyfrog I get fungus gnats and normally i keep my nematodes wet for the first 3 days or more and I wasnt home for 36 hours and they dried out and i got a few from it. There is only like 2 or 3 in there. Alot of it is cause the moisture in the pots. Once you can dry the pots out some in between watering I never had a problem. Or if I kept up better pest management.