Zevo 2 Flying Insect Traps & 4 Refill Cartridges - Plug in Fly Trap & Indoor Bug Catcher for Gnats, House & Fruit Flies - Blue & UV Light Technology, Mess-Free Alternative to Bug Zapper

the water you use could be mixed with mosquito bits (works for gnats) or the liquid version ( https://a.co/d/0hWXK034 ). can take a week or so to see results but it works. fruit fly traps ( here also help, put these around your bins. Zero Flying Insect Traps seem to catch a good amount for us as well. when making ventilation holes you should either get plug ins with fine mesh ventilation or cut a sheet of sieve cloth, cheese cloth, something like that to prevent gnats going in and out. letting the top layer of substrate to dry just a bit more should help without hurting the isopods too, at least until things get better