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pH is the measure of acidity of water on a scale ranging from 0 to 14. A pH of 0 is the most acidic while a pH of 14 is the most alkaline. Different geographies have different tap water conditions with different pH levels while fish require a specific pH level to thrive. A pH of 7.0 is ideal when keeping a community aquarium containing a variety of tropical fish. Goldfish and livebearers prefer a pH of 7.5. Many Amazonian fish like angelfish and neon tetras prefer a pH of 6.5 to 6.8. Mollies and swordtails thrive at pH 7.2 to 7.5. API pH DOWN Freshwater Aquarium Water pH Reducing Solution lowers aquarium pH in freshwater aquariums to desired level. Safe for fish and plants. Use when setting up a new aquarium adjusting pH or changing water. pH in an aquarium can fluctuate due to fish waste uneaten food and addition of tap water. It is recommended to test water for pH weekly. With API Aquarium products it?s easy to keep a beautiful saltwater freshwater or reef aquarium. For over 50 years API has bee