Cocoblox have worked very well for me. No fungus gnats, no wood mites. Very, very rarely get mold, and only if they make a huge mess from soaking and spilling tons of water and I didn't catch it fast enough to pull some of the wet chunks out to dry under better ventilation.
I do however get fungus gnats in my bedroom from my houseplants on occasion and apple cider vinegar with a drop of dawn in a jar seems to work pretty well.
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