I feed them everything and anything I possibly can LOL. I don't produce the full amount. What I do is take some of used cannabis soil from indoor grows and use it to seed a new bin. And then from there is all food scraps minus dairy and meats, all my cannabis leaves that get pruned, coffee grounds, ground up egg shells, shredded paper scraps, some hard wood leaves during the fall season (though most that goes toward the outdoor compost). Oddly I find worms absolutely love cooked oatmeal LOL. They flock to that before any other food source I put in there. Over the course of a year, the soil I started with will essentially increase by about 25%-40% in volume. I feed each bin of vermi compost about once a week to 10 days.I've thought about vermicomposting but I'm not sure if the effort to collect compostables would be worth it? My current system is to layer whatever is around in cylindrical stock wire bins four feet high. I just let them do their thing for a couple of years, then sift the compost into a wheelbarrow.
What are you feeding to get so much soil?