For superworms, I personally keep them in a bran and rice infant cereal mix and add in collard greens, mustard green, dandelion greens, sweet potato, squash.. what ever i am using to gut load crickets with. They eat it up. Just be sure that if the dry bedding (bran/cereal) that they are in gets damp AT ALL that you change it to remove the risk of mold or bacteria buildup.