FTCG
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To stop the cycle..spread a layer of sand or perlite on top of the medium to prevent the larvae from burrowing down.I have a lot of experience treating for fungus gnats.i,v tried many things to kill or control em.nothing worked as good as fungus gnat nematodes and some sticky yellow traps.its cheap and very very effective.from the look of that coffee cup you have a really bad infestation and at that level they can kill your plants .
If your in the uk let me know and I can give u a number for a distributer of the nematodes.