Aquatic Arts 3 Cuttlebone Pieces for Aquarium Use Provides necessary minerals for healthy shell growth in snails, and healthy carapace in crustaceans Helps prevent shell breakages, cracks, and subpar growth in aquatic snail shells Can be added directly to aquarium filter, or boiled and added to aquarium for grazing Will float unless boiled or soaked for 10 or more days in water One cuttlebone lasts over a year in most aquariums