The lesser meal beetle is what I use to keep the roach bins from getting sour from dead roaches. They quickly converge on the dead and devour it with enthusiasm. I acquired these by accident in an order I received at some point and have been using them for more than 10 years. The worms, which are essentially tiny meal worms, are great feeders for smaller animals. I used them for small spiderlings with results similar to roaches. When the numbers become to great in the roach colony, they can be sifted out with 1/8th” screen. The order comes mixed with worms and beetles. If you need the worms for feeders, there are times when I have quantities of them , so let me know if feeders is your intention.