I raised a colony of dubias when my beardie was alive and it really is completely foolproof. It is very hard to kill a dubia...they are extremely hardy insects. I used a solid color tub approx. 18"Long x 10"Wide x 18"High with an Ultratherm heat pad (on a rheostat) with egg crates stacked vertically in about half of the tub. I stacked them vertically so the poo falls to the bottom of the tub rather than accumulating in the egg crate.
The nice thing about Dubia is they don't fly, they can't climb smooth surfaces, they don't smell, and they don't make any noise. If you keep the heat pad around 90-95 degrees and provide plenty of food, they will reproduce very quickly. My colony was established and breeding in about a month.
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