DISCUS VITAMINS AZOO PLUS Discus Vitamins is a Premium Vitamin complex for Discus Fish that provides essential vitamins for healthy growth and ß-Glucan, which notably strengthens the fish’s immune system. It contains important vitamins that are not always provided to our fish with dry food, such as the B complex (B1, B2, B6), vitamin A, D, E, among others. Uses of Product. 1. 1ml of product treats 10 liters of water in your aquarium. 2. For regular use, add 10ml for every 100 liters of water in your aquarium weekly. 3. For use during disease treatment, add 10ml for every 100 liters daily.