Aquarium snails are popular additions to tanks due to their ability to help clean algae, uneaten food, and debris while adding visual interest. Common species include nerite snails, mystery snails, ramshorn snails, and Malaysian trumpet snails, each with unique behaviors and care requirements. Some snails, like nerites, do not reproduce in freshwater, preventing overpopulation, while others, like ramshorn and trumpet snails, can multiply quickly. They require proper water conditions, calcium for strong shells, and a balanced diet beyond algae. While beneficial, snails should be chosen carefully to prevent overpopulation and maintain a healthy tank environment.