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"\n\nIf the pH level in your fish tank is too high, it can cause a variety of problems for both you and your fish. Too-high pH levels make the water more alkaline and can lead to an increase in dissolved solids such as carbonates and bicarbonates that can interfere with your fish&#x2019;s ability to effectively use oxygen. This lack of oxygen will harm their gills, eyes, fins and skin. In some cases, too-high pH levels can also encourage the growth of bacteria or fungi which are harmful to your fish&#x2019;s health. Additionally, if the pH level rises above 8.5 it could result in scales becoming loose on certain types of freshwater fishes like Goldfish or Koi carp due to a process known as osmotic shock. As such, it is important that you regularly check the acidity level (or &#x2018;pH balance&#x2019;) in your aquarium so that any issues arising from too-high pH levels can be quickly addressed before they become serious problems for your aquatic inhabitants!"
<https://aquariumia.com/how-to-lower-ph-in-aquarium/>