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"\n\nIn order to lower the pH in your aquarium without lowering alkalinity, it is important to understand a few things about pH and alkalinity. Firstly, you should know that these two elements are related; alkalinity helps to buffer the water, preventing drastic swings in pH levels. Secondly, you need to understand what substances can be used to lower the pH of your tank while maintaining its alkalinity level. The most common way of achieving this is through adding an acid such as phosphoric or nitric acid into the water column; however, caution must be taken when doing so as there can be adverse effects on fish and plants if done incorrectly. Additionally, certain buffering agents like sodium bicarbonate can also be used for lowering pH without affecting alkalinity levels but again proper research needs to be done before using these products in your tank. Finally, an often overlooked method for controlling aquarium chemistry is simply by manipulating water changes &#x2013; frequent small water changes with slightly acidic RO/DI (reverse osmosis/deionized) water can help reduce overall pH without significantly impacting other chemical parameters in your tank such as hardness and carbonate hardness (alkalinity)."
<https://aquariumia.com/how-to-lower-ph-in-aquarium/>