What do you use for mealworm bedding that they will not eat?

For mealworm bedding that they won't consume, you can use materials like oat bran, wheat bran, or rice flour, as these serve as a substrate for them to burrow into rather than a food source. Additionally, you can use shredded newspaper or cardboard, which provides a suitable environment without being a source of nutrition. It's important to ensure that the bedding is clean and dry to maintain a healthy habitat for the mealworms.