I should have added, just because they are getting enough calcium doesn't mean that they are absorbing it. Without vitamin D the calcium is passed straight through the body and not absorbed. That's why UVB( the sun or artificial is so important). There's also Vit D in some foods, but I don't know the correct diet for stars.
Also if you feed to many foods high in oxalates it binds to the calcium and passes through the body. An example of high oxalate food is spinach. It's ok to feed redfoots from time to time but not every day.
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