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Natural Ways to Increase pH in an Aquarium

by Rahim Mohamed 06 Jun 2024

Maintaining the optimal pH level in an aquarium is crucial for the health and well-being of aquatic life. While commercial pH adjusters are available, several natural methods can safely and effectively increase the pH in an aquarium.

1. Crushed Coral or Limestone

  • Method:
    • Add crushed coral or limestone to the aquarium filter or substrate.
    • These materials release calcium carbonate into the water, gradually increasing the pH.
  • Tips:
    • Start with small amounts and monitor the pH regularly to avoid overshooting the target range.

2. Baking Soda

  • Method:
    • Dissolve baking soda in a separate container of aquarium water.
    • Gradually add the solution to the main tank while monitoring the pH.
  • Tips:
    • Use small doses and be cautious, as baking soda can increase the pH rapidly.

3. Eggshells

  • Method:
    • Crush eggshells and place them in a mesh bag or nylon stocking.
    • Submerge the bag in the aquarium filter or attach it to a decoration.
  • Tips:
    • Eggshells release calcium and magnesium ions, which help buffer the pH.

4. Indian Almond Leaves

  • Method:
    • Add Indian almond leaves to the aquarium.
  • Benefits:
    • These leaves contain tannins, which lower acidity and increase pH.
    • They also provide antibacterial and antifungal benefits.

5. Sea Shells

  • Method:
    • Place sea shells in the aquarium.
  • Tips:
    • Similar to crushed coral, sea shells release calcium carbonate and gradually increase the pH.

6. Live Plants

  • Method:
    • Add live plants to the aquarium.
  • Benefits:
    • Live plants consume carbon dioxide during photosynthesis, which raises the pH.
  • Suggestions:
    • Choose plants known for their pH-adjusting properties, such as Java fern, Anubias, and Amazon sword.

7. Aeration

  • Method:
    • Increase aeration in the aquarium.
  • Benefits:
    • This helps remove carbon dioxide from the water, which results in a higher pH.


  • Testing:
    • Always test the pH before making any adjustments.
  • Gradual Changes:
    • Make changes gradually to avoid shocking the aquatic life.
  • Regular Monitoring:
    • Monitor the pH regularly and adjust as needed.
  • Avoid Chemicals:
    • Avoid using chemicals or sudden pH changes, as these can harm fish and other aquatic creatures.

By implementing these natural methods, aquarium owners can safely and effectively increase the pH in their tanks, ensuring a healthy and balanced environment for their aquatic inhabitants.

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