Mystery snails are freshwater snails, and adding salt to their tank will create a saltwater environment, which they are not adapted to.
Here's why salt can be harmful:
* Osmosis: Freshwater snails are designed to live in environments where the water concentration inside their bodies is higher than the surrounding water. Adding salt to their tank disrupts this balance, causing water to rush out of their bodies. This can lead to dehydration and even death.
* Stress: Salt can stress the snails and make them more susceptible to disease.
If you're looking to add minerals to your mystery snail's tank, you can use a dechlorinator with added minerals. This will provide the necessary nutrients without harming the snails.
Always research the specific needs of your pets before introducing anything new to their environment.