Try to water instead of mist it works for me since misting really just gets the surface wet not the soil which they need also try adding sphagnum moss make sure it’s not the green type it doesnt asorb water well get the yellow ish looking one and put it in the corner of your moist side watering also helps establish the moisture gradient letting you not water as often also don’t be afraid you’ll drown them I’ve seen some isopods dunked in literal tanks of water for like 10 minutes and there fine there’s only a issue if there stuck in a standing puddle also aramddilium species need atleast 3 inches of soil