Tortoises can eat biscuits, but they can't feed salty ones, and they have to be crushed. It is an omnivorous animal, and there are many acceptable foods. Biscuits are not harmful to its health, so they can be used for feeding, but they cannot be used as staple food, just feed once in a while. The reason why salty turtles can't be used is that turtles have poor metabolism of salt. If they consume too much salt, their bodies will be swollen.

1. Animal feed: Tortoise usually takes animal feed as its staple food, as long as a small part likes to eat plants. There are many kinds of animal feed, such as small fish, shrimp, snail mussels, earthworms and aquatic insects, etc. These foods are more popular for turtles and have high protein content, which is very helpful for their growth.

2. Plant feed: Plant feed mainly supplements various nutrients, so that it can develop healthier. Common feeds are mainly grains, bean cakes, vegetables, fruits and aquatic plants, etc. Because of the low amino acid content, it cannot be used as the main food, so it must be matched with animal feed.

3. Artificial feed: Artificial feed is usually made of a variety of ingredients, and its own nutrition is rich. Although it is beneficial to the growth of turtles, its taste is average, so turtles don't like it very much, and they need other feeds to improve their appetite.