Here's why:
* Goldfish are messy eaters: They produce a lot of waste, which pollutes the water quickly. Snails are very sensitive to water quality and will die in polluted water.
* Goldfish are aggressive: While goldfish are not typically aggressive towards other fish, they can be towards snails. They may try to eat them, or injure them with their fins.
* Different water parameters: Goldfish prefer slightly cooler water than snails, and their ideal water parameters are not always the same. This can make it difficult to maintain a healthy environment for both species.
Instead of keeping snails with goldfish, consider:
* Choosing a different tank mate for your goldfish: There are many peaceful and compatible fish species for goldfish, like other cold-water fish, some types of loaches, and certain bottom feeders.
* Keeping your goldfish in a species-specific tank: This will allow you to better control the water parameters and ensure a healthy environment for your goldfish.
* Setting up a separate snail tank: Snails can be fascinating creatures to observe, and they can thrive in a well-maintained aquarium.
Remember, responsible pet ownership involves providing the best possible living conditions for your animals. Mixing incompatible species can lead to stress and even death.