One of my African Bullfrog tanks (10 gallon aquarium) seems to be the breeding ground for these little black flies. I have also found these flies in the soil of some of my houseplants. I'm treating the houseplants with a spray, but I was wondering if there was a safe way to treat them in my frogs' enclosure? I plan on taking her out and giving her fresh soil, but is there any way to treat such an infestation that is safe for my frog but deadly for the flies?? Thanks in advance!