Increase pH In Your Aquarium

6 Natural Ways To Increase pH In Your Aquarium (+ 4 Chemical Ways)

pH stands for “potential of hydrogen” and measures the acidity or basicity of a solution or water. pH is a scale that ranges from 0 to 14, with 7 being neutral, less than 7 being acidic, and greater than 7 being basic or alkaline.

The ideal pH value of normal water should be 7, i.e., neutral water. The pH level of fresh water is important for aquatic life because many fish, plants, and other aquatic organisms have specific pH requirements to survive. A change in pH levels, even a small one, can impact the health and well-being of the organisms living in the water.

In this article, we will share why maintaining the correct pH value of water in aquarium is important and how natural + chemical ways to increase pH in your aquarium.

Why Maintaining The Correct pH Value Of Water In Aquarium Is Important?

In an aquarium, replicating a natural habitat is important to make aquatic life thrive. And it requires healthy water parameters, i.e., correct pH level.

  • Fish health: Many species of fish have specific pH requirements, and changes in pH levels can impact their health and well-being, impacting fish respiration & making them more susceptible to disease and stress.
  • Stabilizes water quality: Maintaining the correct pH value of water in your Aquarium helps to stabilize water quality and prevents sudden shifts in pH levels.
  • Enhances biological filtration: The correct pH level is essential for the proper functioning of biological filtration. Biological filtration helps to break down the concentration of ammonia and nitrites, and having the right pH helps the bacteria do their job more efficiently.
  • Promotes plant growth: Aquarium plants need the right pH to grow and remain healthy. Too high or low pH levels will prevent plants from using the necessary nutrients to grow.
  • Prevents algae growth: High pH levels can cause algae growth in your Aquarium, which can be a nuisance. Keeping the pH levels at the correct value can help prevent this.

6 Natural Ways To Increase pH In Your Aquarium

Aquarium pH levels are a crucial factor in the health and well-being of aquatic life. Maintaining a stable pH range ensures a healthy environment for your fish and other aquatic species. If you notice that the pH levels are too low, you may need to raise them to provide a more suitable environment for your aquarium inhabitants.

There would be questions roaming in your mind as to how to increase pH without resorting to chemical products. Try the following 6 safe methods to naturally raise the pH level in your Aquarium.

  • Use crushed coral or aragonite sand: The crushed coral or aragonite sand will naturally buffer the water, which will help raise the pH. This is because the substrate absorbs acids and releases alkaline substances into the water, increasing the pH. The substrate can be purchased in aquarium shops or online and easily added to the bottom of the Aquarium.
Use Crushed Coral
  • Add aquarium-safe rocks: Adding rocks such as dolomite or limestone to the Aquarium will help to raise the pH. The rocks will dissolve over time and release minerals into the water, which will help to raise the pH. It is important to use rocks safe for aquarium use, as some rocks may contain harmful chemicals that can harm your fish and other aquatic life.
Aquarium Safe Rock
  • Increase aeration: Aeration helps to release carbon dioxide, which reduces the acidity of the water. By increasing the aeration in your Aquarium, you can help to raise the pH. This can be done by adding additional air stones or by increasing the power of your existing air pump.
Increase Aeration
  • Use live plants: Live plants can help to raise the pH by consuming carbon dioxide and raising oxygen levels in the water. This helps to reduce the acidic aquarium water and increase the pH. Plants also provide a natural source of oxygen for your fish, which can help to keep them healthy and thriving.
Use Live Plants
  • Change the water regularly: Regular water changes make clean water and reduce the buildup of organic compounds, which can lower the pH. When changing the water, it is important to use water similar in temperature and pH to the water in the Aquarium. This will help prevent sudden shifts in water chemistry, which can harm fish and other aquatic life. As a rule of thumb, you can change 50% water every other day until the water in the aquarium is in a good range.
  • Limit feeding: Overfeeding can lead to waste buildup, which can lower the pH. Limiting the amount of food you give to your fish can reduce the amount of waste produced, which will help keep the pH levels stable.
What Human Food Your Betta Fish Can Eat

In conclusion, these six natural ways to raise the pH levels can help to create a healthy, stable and perfect aquarium environment for your inhabitants.

4 Chemical Ways To Increase pH In Your Aquarium

Chemical solutions are often used to quickly increase the fish tank pH levels when too low. However, it’s important to be cautious when using chemical solutions, as they can adversely affect the healthy aquarium environment if used improperly. Here are some commonly used chemical solutions to increase pH:

  • Sodium bicarbonate (baking soda): Sodium bicarbonate is a common solution to increase an aquarium’s pH. It is added to the water in small increments until the desired pH level is reached. It is important to use baking soda specifically, as other forms of sodium bicarbonate may contain harmful chemicals that can harm the natural environment of your aquatic life.
Desire Baking Soda Jar 1 Kg
  • Multi-purpose: Desire Baking Soda is a versatile product that can be used for baking, cleaning, and personal care.
  • Natural and safe: Made with 100% pure and natural sodium bicarbonate, our baking soda is free from harmful chemicals and additives, making it safe for you and your family.
  • Sodium carbonate (soda ash): Sodium Carbonate is the disodium salt of carbonic acid with alkalinizing properties & is used to increase the pH in an aquarium. It is a more potent solution than baking soda and should be used cautiously, as overuse can quickly raise the pH to dangerous levels.
Purenso Select – Soda Ash (Sodium Carbonate) I Washing Soda, Tie Die, pH Increaser, and More, 200g
  • 🧼 Washing Soda, also known as Soda Ash, Sodium Carbonate, Soda Crystal, or “Soda Ash Activator” has been in use since 3500 BC. It is commonly used as a household cleaner, in tie-dying, making powdered soaps, softening water, and balancing water’s PH. Also used to make non-powdered-soaps, paper, and glass.
  • 🧼 It is a great all-around cleaner. It excels at cleaning silver, laundry, grout, sinks, stoves, and anything with a hard water stain, “stripping towels” or other laundry. Simply add a scoop to your laundry detergent to give it a boost.
  • Calcium carbonate: Calcium carbonate is a natural solution that can raise the pH levels in an aquarium. It is available as a powder and is used for changing the nature of acidic water to alkaline water. It can be added to the water in small increments until the desired pH level is reached.
NOW Foods Calcium Carbonate Powder — 12 oz
  • 100 Tablets Oyster Shell 500mg
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  • pH-adjusting Solutions: pH-adjusting solutions are specifically designed to increase the pH in an aquarium. They are often more potent than other chemical solutions and should be used cautiously, as overuse can quickly raise the pH to dangerous levels.
Qpets® 50pcs Water PH Testing Strips, 7 in 1 Water Qulity Test Strips Water Testing Kit Freshwater Saltwater Aquarium Water Test Kit for PH Nitrite Nitrate Chlorine Carbonate Hardness
  • 7 IN 1 AQUARIUM WATER TEST STRIPS: Combining the test for 7 important indicators of water quality testing, this chlorine test kit can tell you 7 different indicators of liquid, Nitrate, Nitrite, General Hardness, Free Chlorine, PH, Carbonate, Total Alkalinity. Suitable for drinking water, aquariums, swimming pools and spas, industrial water, ponds, spa water
  • ACCURATE TEST RESULT: Made of PET material, not easy to oxidize, with great anti-VC interference characters, so it can provides more accurate data under complex water quality and environment situation .

Using a High-range pH test kit to measure the pH levels before and after using the chemical solution is important. These test kits are based on strip tests based on color coding. Usually, pH test kits come in Aquarium test kits available online.

Also read: The 8 Surprising Truth About What Human Food Your Betta Fish Can Eat

Reasons For Low pH Levels In Aquariums

A low pH level in an aquarium can be caused by several factors, including:

  • Uncycled or New Tank: When setting up a new aquarium, the tank is usually not cycled and has little to no beneficial bacteria. This can lead to a low pH, as nothing can naturally buffer the water.
  • High Nitrate Levels: Nitrate-rich water can lead to a low pH, as nitrates are acidic. This is why it’s important to maintain good aquarium maintenance and keep nitrate levels in check.
  • Overstocking: Overstocking can lead to a low pH level, as more waste is produced than the beneficial bacteria can break down. This leads to an overload of waste, which can cause the pH to drop.
  • Decomposing Organic Matter: Decomposing organic matter such as leaves, fish waste, and uneaten food can lead to a low pH, as the decaying matter produces acids.
  • Tap Water: Tap water can contain additives such as chlorine and chloramine to lower the pH. It is important to treat tap water before adding it to the Aquarium.
  • Overfeeding: Overfeeding can lead to a low pH, as the extra food will decay and cause an overload of waste in the Aquarium.
  • Improper Water Changes: Not doing regular partial water changes can lead to a low pH. Frequent water changes help to remove built-up waste and toxins in the fish tank water, which can cause the pH to drop.

It is important to regularly monitor pH levels in an aquarium and address any changes promptly to maintain a healthy environment for aquatic life.

How Does Incorrect pH Level Impact Fishes In Aquariums?

Incorrect pH levels in an aquarium can significantly impact the health and well-being of the fish living in the environment.

  • Stress: This is the most common symptom. A sudden change in pH levels can cause fish stress, weakening their immune system and making them more susceptible to fish disease.
  • Disease: Incorrect pH levels can also lead to the growth of harmful bacteria, which can cause disease and infection in fish.
  • Difficulty breathing: Fish rely on a delicate balance of ions in their gills to extract oxygen from the water. When pH levels are incorrect, it can make it difficult for fish to extract enough oxygen, leading to stress and even death.
  • Reproductive issues: In some species, incorrect pH levels can also impact their reproduction ability. This can lead to population decline and the eventual extinction of certain species in the Aquarium.
  • Poor growth: Incorrect pH levels can also impact the growth and development of young fish, leading to stunted growth and developmental problems.

Maintaining the correct pH of fish levels in an aquarium is important to provide a healthy environment for fish. Regular monitoring of pH levels and promptly addressing any changes can help prevent incorrect pH levels’ negative impacts. In addition, proper filtration, water changes, and avoiding overstocking can also help maintain correct pH levels and ensure the health of the fish in the Aquarium.

How To Test The pH Level Of Your Aquarium?

Testing is essential to maintaining the perfect pH level in your Aquarium. There are several methods for testing the pH level of an aquarium:

  • Test strips: pH test strips are a simple and quick method for testing pH levels. These are the manual test kits in which you have to dip the strip into the aquarium water, wait for the recommended time, and then compare the color of the strip to a color chart to determine the pH level.
  • Liquid test kits: Liquid test kits use a dropper to add a solution to a small aquarium water sample. The resulting color change is then compared to a color chart to determine the pH level.
  • Electronic testers: Electronic testers use electrodes to measure the pH level in the water. These testers are typically more accurate than other methods but can be more expensive.

Regardless of the method used, it is important to test the pH level regularly, at least once a week, to ensure that it remains within the appropriate range for the fish species in the Aquarium. Regular testing can also help to detect any changes in pH levels early, allowing you to take corrective action before any negative impacts occur.


In conclusion, raising the pH level in the Aquarium is important for the health and well-being of fish and other aquatic life. Both natural and chemical methods can be used to increase the pH levels, but it’s important to use caution and follow instructions carefully when using chemical solutions.

Regularly monitoring the pH levels using a pH test kit is also crucial to ensure the pH is within a safe range. Ultimately, the goal is to create a stable and healthy environment for your aquarium inhabitants, and adjusting the pH levels is an important step in achieving that goal.

Frequently Asked Questions

  1. Why is my aquarium pH so low?

    A low pH in an aquarium can be caused by several factors, including high levels of organic waste, low aeration, low water hardness, high carbon dioxide levels, and overpopulation of fish. These factors can lead to a build-up of acids in the water, lowering the pH levels and creating an environment harmful to fish and other aquatic life.

  2. What is the best way to raise the pH in water?

    The best way to adjust pH in water depends on the specific situation, but some common methods include adding a chemical solution such as sodium bicarbonate or sodium carbonate, increasing aeration, adding crushed coral to the substrate, or using a pH-adjusting solution.

  3. Can low pH hurt fish?

    Yes, low pH for fish tanks can harm fish. A low pH can create a toxic environment for fish, causing stress, disease, and even death. A pH that is too low can interfere with the fish’s ability to absorb nutrients and oxygen, leading to poor health and decreased survival rates.



Meet me, your dedicated author and fish aficionado. With a deep-rooted passion for all things aquatic, I bring a wealth of knowledge, experience, and enthusiasm to this fish and aquarium website. As an avid fishkeeper myself, I understand the joys and challenges that come with creating a thriving underwater world. Through my articles, guides, and recommendations, I strive to provide you with accurate, reliable, and engaging content that will enhance your fishkeeping journey. Join me as we dive into the fascinating realm of fish and aquariums, and together, let's make your aquatic dreams a reality.

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