Well, today I am going to be talking to my parents about starting a dubia roach colony for the bearded dragon I'm getting soon. I've gotten quite used to them just by seeing pictures of them and watching youtube videos on colonies. About how many adult dubias will I need to start a colony for one bearded dragon?
The more you start with the merrier. I would get a mix of adults and nymphs to give you a wide variety of starting sizes. I started out with a couple hundred adults with several hundred babies/nymphs. You could always get what your budget allows for and slowly add more down the road if you need more.