API Proper pH 7.5 Freshwater Aquarium Water pH StabilizerAPI Proper pH 7. 5 Freshwater Aquarium Water pH Stabilizer is a specialized formula designed to quickly and safely adjust the pH level of freshwater aquariums to a neutral level of 7. 5. This pH stabilizer is ideal for use in community aquariums where a stable pH level is essential for the health and well being of fish and other aquatic inhabitants. The unique buffering agent in API Proper pH 7. 5 helps to prevent pH swings and maintains a consistent