Here's why:
* Predatory nature: Bettas are natural predators and will often attack and eat anything that fits in their mouths.
* Territorial behavior: Bettas are highly territorial, and they may see snails as a threat to their space, even if the snail is not actively competing for resources.
* Aggressive temperament: Some betta fish are naturally more aggressive than others, and these individuals are more likely to attack snails.
However, there are some exceptions:
* Small snails: Bettas may not bother very small snails, as they may not be seen as a threat.
* Well-fed bettas: A betta that is well-fed and happy may be less likely to attack snails.
* Snail species: Some snail species are more likely to be eaten by bettas than others. For example, mystery snails are known to be relatively safe from bettas.
It's important to note that even if a betta doesn't kill a snail, it may stress it out, leading to health problems and even death.
If you are considering keeping snails with a betta, it is important to do your research and choose a snail species that is known to be relatively safe. You should also observe your betta's behavior carefully and be prepared to remove the snails if necessary.