She does pick at the rock, and I'm not worried about her starving, but at some point the rock won't be able to provide enough food. The store I bought her from said they feed Formula 2. I don't have this food, and I have so much other food that I don't want to buy more. Is there something in this food? She had been there for 4 weeks and looked very healty. She must have been eating. I put food right in front of her, and she just ignores it, go figure. Must be watching her weight. : )