Why is the shell on my turtle's ass soft? Are you sick?

I agree with you. Your description does not seem to be a symptom of calcium deficiency. Calcium deficiency should be caused by soft turtle shell. You may be too worried. Let's take another look!

But I can give you some experience of raising turtles:

First of all, it is normal for newly bought turtles not to eat. First of all, during transportation and storage, turtles will lose their appetite due to incorrect feeding methods. In this case, turtles usually provide a comfortable living environment after buying it back, and they can adapt to it after a period of time. Secondly, because the artificially bred turtles live in groups, they don't want to eat when they buy them home because of loneliness and environmental changes, which requires an adaptation process.

Moreover, even if it doesn't eat for months, it won't starve to death. If it is hungry, it will eat naturally. The most suitable feeding period for the Brazilian tortoise is from Grain Rain to autumnal equinox in the 24 solar terms every year, which is its favorite feeding stage and its vigorous growth period.

You can feed it with a toothpick in lean meat the size of a grain of rice (once a day) and rub it in front of its nose to eat, but some turtles are slow to respond, so you have to be patient.

Please note that the Brazilian tortoise must eat in the water!