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Pond snails are usually met as hitchhikers, but bought deliberately they are a genuinely useful clean-up crew — grazing algae, biofilm and decaying leaves, and breeding fast enough to serve as live food for pufferfish and loaches.
They are entirely shrimp-safe and will not damage healthy plants, though they will finish off dying leaves. Population size tracks feeding: overfeed and they multiply, cut back and numbers fall.
Keep GH above 6 to protect shells.