The Biodiversity Fungus Gnat Eradicator (Rove Beetle, Predatory Mites)Always FREE Standard Shipping! One of the biggest complaints when building a brand new Bioactive Living Soil Isopod substrate is the fact that fungus gnats are almost guaranteed to appear. Even seasoned Isopod breeders are sure to come across these at some point or another they are almost inevitable. Suppose you choose NOT to be proactive in your Integrated Pest Management (IPM) protocols; the perfect temperature and humidity levels for Isopods are