Reccomendation: do not keep millipedes with roaches in General Blattodea Discussions Posted March 24 Yeah, but not very many. Definitely not enough to mob the millipede. It could have easily escaped superworms. I also went through and moved any superworms I could find to my vermicomposting system. The dubia just don't seem like they're interested in live prey to have been the issue. The millipede seemed fine until this happened. Death from stress is the only thing that makes sense to me. I suppose there could have been an underlying issue I didn't know about and the stress caused it to kill it of course.