I know a lot of people are wondering when their dubia feed. The answer is, at night when you aren't bothering them. I listed a couple videos of them feeding. Pretty neat IMO.
I'm currently in the last phases of grain mite removal, and the roaches are finally getting fed every day so they'll come out for food even when the light's on. I'll dump a large capful of crushed cat food in there at night, and it's hilarious to see a tiny nymph either curl around a piece of the cat food and go to town on it, or try to drag off under the egg crates a piece almost as big as itself.