The thing you will need is fresh fruit and give it not only to the adults but small amounts likely to the larvae depending on the species you get. But when they rotting wood it is full on rotting oak chips, and the best way to do that is make fermented kinshi because in a short time nothing else would be made regularly. They eat a large amount, and you can't allow the grubs to get over crowded or else they will cannibalize each other.