While it's possible to keep multiple snail species together, it's essential to research their compatibility first. Some species, like assassin snails, prey on other snails and can quickly decimate their populations. Others, like apple snails and mystery snails, may compete for resources or even breed with each other, leading to hybrid offspring. To maintain a balanced and harmonious tank, stick to species that have similar requirements and won't interfere with each other's well-being.