Thank you! The earthworms are normal sized, and he seems to love them. I'm in the process of doing some improvisational changes to the enclosure, to make it a little more habitable for him until I can get to the store tomorrow. I removed the river rocks and am putting down moist paper towels wadded up, to act as temporary substrate. I'm putting in a shallow bowl for water, as opposed to just having a small amount of water in the bottom of the tank. I'm leaving the 3 large rocks that I have because he seems to like them, and for now, I covered 3 sides of the tank with hand towels. Anything else to suggest?