Dermestids and Isopods make good clean up crews. Isopods are what I would prefer have never tried dermestids. I don't know if dermestids will eat live insects or not if nothing else is available, but I do know that isopods eat all left over food (even molding food), some frass and usually dead bugs. Isopods do not eat living creatures and produce quite well under the right conditions, though to keep them producing you need to have soil, and leaf litter.