How to Raise the pH in Fish Tanks

Fish tanks need to be kept under very specific conditions in order to provide a proper environment for the fish. Water content, temperature and pH level all affect the ecosystem and drastically affect which kinds of fish can inhabit a fish tank. The pH level is a measure of either the acidity or the alkalinity in the water. A water pH less than 7 is considered acidic while a number between 7 and 10 is alkaline, or base. A 7 pH is neutral, which is where pure water is on the scale. You may need to raise the pH level of a tank occasionally.

Things You'll Need

  • Seashells
  • Crushed coral
  • pH-increasing chemical
  • Water test kit
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Instructions

    • 1

      Place seashells or coral into the tank to naturally raise the pH slowly over time. This will gradually release alkaline elements into your water that will raise the pH level. Crushed coral also provides a natural buffer for your water that will make it retain an increased pH level more easily. Adding 1 kg of crushed coral for every 40 liters, about 11 gallons, of water is standard to maintain an elevated pH of 7.6.

    • 2

      Add a pH increaser to your aquarium water. There are multiple chemicals on the market specifically designed for fish tanks. Follow all instructions, since proper application varies depending on the specific product you are using and the size of your tank.

    • 3

      Test the pH level with a water-testing kit to verify that the pH level is where you want it. Pet shops sell pH strips and other kits that can give you a pH reading quickly after being submerged in the tank.