Beneficial Nematodes or Steinernema feltiae for gnat comtrol

I am trying to get rid of gnats in a gecko tank and seeing if anyone else has tried either of the above or may have a solution. Also they may go in a amphibian tank as well. thanks

I have tried neither but don't think there would be a problem with them in either situation. I think I would go with a sundew or butterwort if conditions allowed for them before trying it if it were me...