Oxyshell

5.5 x 5.5cm 25g 1 Piece Cold water tropical Provides a long-lasting steady release of nutrients to help regulate pH levels Reduces the need for multiple water changes each month Keeps aquarium water biologically balanced Transform your aquarium into a tropical paradise with Oxyshell! This 5.5 x 5.5cm, 25g piece provides a steady release of nutrients to maintain pH levels and reduce the need for frequent water changes. Keep your aquarium biologically balanced and enjoy more time admiring your underwater world.