Here's why:
* Ideal pH range: The ideal pH range for most freshwater fish is 6.5 to 7.5.
* Potential issues with high pH: A pH of 7.6 is just outside the ideal range, and can cause problems for some fish. High pH can make it difficult for fish to absorb nutrients, can irritate their gills, and can make them more susceptible to disease.
What to do:
* Monitor the pH: Regularly test the pH of your tank water to ensure it stays within the ideal range.
* Adjust the pH: If the pH is consistently above 7.5, you can adjust it by adding a pH buffer or using a water conditioner that lowers pH.
Note: It's important to research the specific pH requirements of the fish you keep in your tank, as some species may tolerate slightly higher pH levels than others.