How Often Should You Change Betta Fish Tank Water?

How Often Should You Change Betta Fish Tank Water?

Keeping your bettas for sale happy and healthy requires a lot of work. Each time you clean their fish tank, you need to thoroughly sterilize every surface to avoid bacteria growth. This means soaking everything in bleach for at least five minutes to kill unwanted microorganisms. To ensure the health and safety of your fish, you’ll need to change their water regularly. As a general rule of thumb, betta fish need a fresh supply of water once every two days. However, many different factors can influence this frequency—so you must understand why and how often you should be changing their water tank.

What You Need To Know Before Changing Tank Water

Betta fish are tropical fish, which means they prefer warm, humid conditions. To achieve this, they live in a small amount of water that is between 78 and 80 degrees Fahrenheit. This means that you’ll need to change the water in your betta’s tank more often than other aquatic animals. If you don’t, it’s likely to become polluted with harmful bacteria and other pathogens. When changing your fish tank water, there are a few things to consider.

For example, how often you’ll need to do so will depend on the size of the tank, the number of fish, and even the season. It’s also important to note that water quality is just as important as the frequency of your changes. If your water isn’t clean, your betta’s health will suffer. So, as well as changing the water, you’ll also need to be cleaning it.

Deciding How Often To Change The Water

As we’ve seen, the first decision you’ll need to make is how often to change the water. To make this decision, you must know the condition of your current water. If your water is crystal clear, you can probably wait a couple of days longer before you need to ensure a clean supply for your betta. However, if it’s murky and dirty, you’ll need to change the water more regularly.

Betta Fish Tank Water Changes: Why And How

In addition to appearance, you should also be looking out for a drop in water temperature. This will indicate that the water has become warmer and is likely to grow harmful bacteria. Why do you need to change your betta fish tank water? There are a few key reasons.

  1. Temperature – As we’ve seen, betta fish prefer warm water. If your water is too cold, you risk harming your fish and making them sick.
  2. PH – The water in your fish tank will have a pH balance. This could change over time, so to avoid harming your betta, you’ll need to adjust it by changing the water.
  3. Filtration – The bacteria that grow in your tank water naturally act as a filtration system. However, if it builds up into harmful colonies, you’ll need to remove it by changing the water.
  4. Safety – Bacteria in your fish tank water can be harmful to your betta. If your water has a high level of bacteria, you’ll need to change it as soon as possible.

Tips For Successful Changes

It can be a daunting task, but if you follow our tips, you’ll find that changing your fish tank water is very straightforward.

  1. Prepare your tank – Before you get started, you must prepare your tank. Clean the tank, remove any decorations and fishnets, and fill the tank with fresh water.
  2. Change the water – Now you can change the water. Although you can use tap water, filtered water is the best choice.
  3. Clean the tank – After changing the water, you’ll need to thoroughly clean the tank. Use a soft bristle brush or sponge to remove any bacteria and other particles from the tank walls.
  4. Sterilize the tank – Thoroughly sterilizing the tank will ensure that no harmful pathogens can grow in it. You can sterilize the tank using bleach and water.
  5. Change the filter – Your filter should be cleaned whenever you clean your tank. If it’s clogged with dirt, it’s not going to be effective.
  6. Change the water temperature – After a change, you must adjust the water temperature.
  7. Replace the water – Now that the tank has been thoroughly cleaned, you can replace the water with fresh water.


As you can see, changing your betta fish tank water is an important part of their care. By doing so, you’re able to keep the water clean and prevent harmful bacteria from growing. You should be changing your betta fish tank water every two days. To do this, prepare your tank, change the water, clean the tank, sterilize the tank, and replace the water. And remember, as well as changing the water, you also need to be cleaning it to ensure that it remains safe for your fish.


Leave a Reply

Your email address will not be published. Required fields are marked *