Live insects and finely chopped lettuce are often favorite treats. Mealworms, crickets, dubia roaches are good, although the blind one might not be able to catch the fast ones. Millet, sorghum, hulled sunflower seeds, really any small seed or grain will also be popular. They will need grit to digest all of these safely, so make sure you are also providing a bowl of chick sized grit, “chick grit” is a good small size for them.
Dust baths are also good enrichment. Peat moss, potting soil (without fertilizer pellets or perlite), or just dry soil from a clean area will work. For indoor quail I get a decently tall plastic tub, fill it about an inch or two deep and then put the quail in. They’ll start fluffing around soon enough and if the tub is deep enough the dirt spray won’t carry too far, if you moisten the soil slightly they’ll actually prefer that and there’s less dust that gets everywhere.
