About This

• Lowers pH levels in freshwater aquariums with a 16 oz bottle of API pH Down to help fish thrive.
• Raises pH levels in freshwater tanks with a 4 oz bottle of phosphate-free API pH Up to promote fish health.
• Both pH adjuster solutions are safe for use with fish, plants and can be used when setting up a new aquarium.
• Weekly pH testing is recommended to maintain ideal freshwater aquarium water acidity for your fish.
• Over 50 years of API aquarium research and products for easy fishkeeping and water quality maintenance.