I've had 2 bins(none other for some reason) under assault. I'm only finding phorids on dead adults, which made me think the harmless, but annoying type. Now I'm wondering, could they be going after freshly molted roaches? I'm not seeing as many tiny nymphs in those bins so I'm worried they might be killing off my roaches molting into adulthood. Maybe they're just dying from old age too?