yeah but only the biological one works. First thing is thinking holistically about gnats, you want to catch their eggs in the soil, just let it dry out completely, the dry breaks the eggs down : no eggs, no gnats. next thing is the larvae and the adults, try bacillus thuringiensis or bt israelis , these are nematodes that will kill these off by paraciting their brain ... plus they protect against mold for even after the chop. Hope this helps growmie ! 🚀