Waterlife Cuprazin is a Whitespot and Fungus treatment for seawater and brackish water aquaria. Cuprazin can be used to treat all newly purchased sea fishes except Sharks Rays Harlequin Tuskfish Invertebrates and other related species. Cuprazin should not be used in tanks which contain any invertebrates this includes crustaceans. Always read instructions carefully before use. - 60ml bottle (7 day treatment for 128 Litres). Also available in 120ml bottle 500ml professional size