1. Insufficient light: The soft shell of Brazilian tortoise may be caused by soft nail disease, and the main reason for soft nail disease of Brazilian tortoise is insufficient light. Many breeders keep Brazilian tortoises indoors, and most of the time they don't see the sun. Brazilian tortoises mainly rely on sunlight to synthesize vitamin D3. If they can't see sunlight, their synthesis rate of vitamin D3 will slow down a lot.

2. Calcium deficiency: In addition, it may be caused by improper feeding. If the food fed to them by breeders contains less calcium, they are also prone to soft nail disease.

The soft shell of Brazilian tortoise needs to be adjusted according to specific conditions. If it is due to lack of sunlight, the breeder needs to transfer the container outdoors, and it is best to give them sunshine every day. However, the time to bask in the sun should not be too long, and it is best to control it within 1-2 hours. When basking in the sun, we should also avoid the fierce sunshine at noon to avoid other discomfort.

If it is due to calcium deficiency, breeders need to feed them more foods with high calcium content, so that their carapace can become hard. Foods suitable for them are small fish, shrimp and so on. You can also feed some cuttlefish bone meal, calcium powder, shell powder, etc. regularly, which is also beneficial to restore the hardness of their carapace.