I also notice that I had a couple black beetles in my roach colony. The thing is that I had / have alot (around 30 or so) worms. They kinda look like really small super worms but they are brown and black. I took out the roach chow that I had in there and there are still a few with my dubia colony but I have no idea what they are or how they got there. My chow is a mix that I made of cat food, dragon pellets, turtle pellets, and fish food. I will try to remove all the worms in a day or two but in the mean time I put all the old roach chow in a container to see if these worms will grow to figure out what they are. I had a dead adult male roach a couple days ago and another dead nymph today but I'm thinking that it was more chance then these mystery bugs.
My colony is not being feed from yet so I want to make sure that these bugs are not something that will harm it in the long run. I will try to get photos up soon to see if u guys can help identify them. Any info would be great b