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hey how bout introducing the fungus gnats predator?
from: http://www.reefermanseeds.com/forums/showthread.php?t=1568
"There are two that you can introduce that offer long term control. Specifically, Steinernema Feltiae and another one called Hypoaspis Miles(mite) which work well against many invertebrates including thrip and fungus gnat larvae. These critters actively search out the larvae as they are their main food source. They do not harm plants, animals or humans."
or
another one is using predator nematodes that are not your typical parasites.
or use vectoBac..
some actually use mantis (provided that your cham didn't eat them first )