Nutrafin Aqua Plus Tap Water Conditioner. Nutrafin AquaPlus Water Conditioner makes tap water safe by neutralizing chlorine, chloramine and undesirable metals, which are toxic to fish. Formulated with pure herbal extracts, it also reduces fish stress and protects scales and fins from minor scrapes and cuts. Aqua Plus is a complete tap water conditioner that improves aquatic environments for tropical fish. Available Sizes: 30 mL (1 fl. oz) / 120 mL (4 fl. oz) / 250 mL (8.5 fl. oz) / 500 mL (16.9 fl. oz) / 2 L (2.1 qt)