How to Regulate pH Levels in an Aquarium

The pH level in an aquarium is a measure of the tank's acidity. Most fish do best with a pH ranging from 6.5 to 7.5, but many aquarium keepers have difficulty maintaining these levels. With careful tank management, however, you can maintain the pH at a healthy level.

Things You'll Need

  • Kit to test pH
  • Objects to buffer pH, such as coral or limestone decorations
  • Commercial pH-altering chemicals
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Instructions

    • 1

      Test the water's pH using a pH testing kit. These can be found at pet and pond stores. Follow the directions that come with the package. If the pH is within a healthy range, or very close to it, you do not need to do anything else. Aquariums tend to self-regulate and stay at their current pH level.

    • 2

      Use pH buffers in your tank. Aquarium decorations made of coral or limestone are particularly good choices. These items can help to prevent your water's pH from changing to an unhealthy level.

    • 3

      Change the water. Dirty water, chemicals and overfeeding can all contribute to improper pH levels. Completely change the water and make sure your filters are clean. After changing the water, wait at least two weeks before attempting to alter the pH levels by any other means. Aquariums are mini ecosystems and will tend to gravitate toward healthy pH if everything else is healthy.

    • 4

      Use a commercial pH-altering chemical. These should be used very sparingly, since some can be hard on your fish. Consul experts to find one that is gentle enough for your fish.