[SailingSperm]

For the fungus gnats -- Try 'Mosquito Bits' a biological way, using bacteria, of killing them while they're larvae in the soil-- Bti(Bacillus thuringiensis israelensis) produces toxins which are effective in killing various species of mosquitoes, fungus gnats, and blackflies, while having almost no effect on other organisms. They're very effective.

Interestingly, it was first found in a stagnant pool of water in the Negev Desert. (perhaps the only place found to naturally occur)

https://en.wikipedia.org/wiki/Bacillus_thuringiensis_israele...