How to Change Water for Tetras?

If you are keeping Tetras, you surely know that regular water changes are crucial for their health. Changing the water frequently helps to keep the tank clean, fresh, and free of harmful bacteria.

However, if you are new to this, you might be wondering how to do it properly. Don’t worry. We have got you covered. In this article, we will take you through the steps of changing your Tetras’ water to make sure everything goes smoothly. Here’s what you need to do.

How to Change Water for Tetras

Table of Contents

Changing fish tank Water for Tetras

So, before you start changing the water in your Tetras’ fish tank, there are a few things you should know.

First, there are different types of bacteria in the tank, some of which are good, while others are harmful.

The good bacteria will help keep the water clean by consuming ammonia and nitrates produced by fish waste and decaying matter.

These bacteria are found throughout the tank, including in the filter, so it’s not a good idea to sterilize the tank’s equipment.

Changing fish tank Water for Tetra

Now, let’s get to the steps for changing the water in the tank:

01. Disconnect and remove fish tank electronic devices

If you are planning to change your Tetras’ tank water, you should start by disconnecting all the aquarium equipment.

This will prevent any accidents and protect the equipment from damage during the process. It’s also important to unplug everything carefully to avoid any electrical hazards.

Make sure to move the equipment to a safe location where it won’t get in the way. This includes the lighting and heating equipment, filter, and any other gear you might have in the tank. The specific equipment you will need to remove will depend on your tank setup.

02. Drain the tetra fish tank water

Time for some waterworks, Let’s start to change the water. Here are the steps.

Before you start draining, don’t forget to unplug all the equipment and move it somewhere safe. You don’t want to mix water and electricity, trust me.

Depending on your tank’s size, you’ll need to drain a certain percentage of water. For small tanks, 15% to 20% is enough, but larger ones may require 25% to 60%. If you have a lot of Tetras (more than 1 per 2 gallons of water), you might need to do more frequent water changes to keep the tank clean.

While you’re draining the water, take the opportunity to clean the gravel too. A great tool for the job is the Laifoo Aquarium Siphon Vacuum Cleaner. It’s durable, has a 5-feet hose, and won’t disturb your fish while you are sucking out the water and debris.

By using a vacuum cleaner, you can save time and energy during the cleaning process. Plus, it ensures maximum efficiency and thoroughness.

03. Get the fresh water ready

As a Tetra keeper, you would probably use tap water to change your aquarium water. But do you know that tap water contains harmful chemicals like chlorine and chloramines? These chemicals can make your Tetras sick or even kill them.

So, it would be best if you used a water conditioner to neutralize these chemicals before adding water to your tank.

It’s also crucial to check the water temperature to make sure it’s safe for your Tetras. The ideal temperature for Tetras is between 72 to 82 degrees Fahrenheit.

You can use a thermometer to measure the temperature of both the new water and the tank water to make sure they match. But don’t worry if there’s a slight difference. It won’t hurt your Tetras.

Once you’ve added the water conditioner and stabilized the water temperature, the new water is ready for your Tetras.

04. Time to add fresh water

It’s the final step, time to add fresh water to your Tetras’ tank! But wait, don’t just dump it in there like it’s no big deal. It would be best if you were gentle and cautious with this step, or you might damage your tank’s environment.

If you pour the water too fast, you could disturb the decorations and gravel and even hurt your fish and plants. So, it’s best to slowly add water to the tank using a smaller container or pour it in with care straight from the bucket.

Remember, it’s important to be mindful of your Tetras’ living space to keep them healthy and happy.

05. Reconnect the aquarium devices

Now that you have changed the water, it’s time to put everything back in place. Make sure you are gentle and don’t disturb your fishy friends too much. Also, be careful around any electrical equipment, and only handle it with dry hands.

It’s a good idea to keep track of when you last changed the water so you know when to do it again. Setting up a schedule for weekly water changes will help keep your Tetras healthy and happy. So, mark it on your calendar and get ready for the next round of water change.

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How Often to Change Water for Tetras?

When it comes to changing the water for your Tetras, there are a few factors to consider. The size of your tank and how many fish you have can impact the frequency and amount of water changes needed.

How Often to Change Water for Tetras

Smaller tanks and overcrowded environments may require more frequent and extensive water changes due to higher waste production.

In general, it’s recommended to perform weekly water changes, replacing around 15% to 30% of the water each time. However, certain situations may require more drastic measures.

For instance, if you have a hospital tank for sick Tetras treated with medication, you may need to change 50% to 70% of the water. Keeping track of your water change schedule can help maintain a healthy and stable environment for your Tetras.

Is Tap Water Good for Tetras?

Yes. Tap water can be used for Tetras, but it needs to be treated before being it to the tank. It’s important to note that tap water contains chemicals like chlorine, chloramines, lead, and mercury that can harm the fish.

Therefore, a water conditioner is needed to neutralize these substances and make the water safe for Tetras.

Many products are available on the market, and it’s essential to choose one with good reviews. Failure to treat tap water can lead to serious health problems and even death for your Tetras.

Can You Use Rain Water for Tetras?

Well, it’s not exactly a yes or no answer. Rainwater is definitely better than tap water since it doesn’t have any chlorine, which is great for your Tetras. Plus, in the wild, Tetras often swim in rainwater since they live in tropical areas where it rains a lot.

But there’s a problem. Rainwater can be polluted, especially in cities where the air is dirty. That pollution can harm your fish in the long run. And even if the rainwater is clean, it might not have all the minerals your Tetras need to stay healthy.

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So, if you really want to use rainwater for your Tetras, you’ll need to treat it and test it to make sure it’s safe.

But honestly, it’s probably better to stick with tap water and use a conditioner to get rid of the chlorine. That way, you know your Tetras are getting the right balance of minerals and won’t be harmed by any pollutants in the water.


In conclusion, changing the water in your tank is super important to keep your fish happy and healthy. It helps keep their home clean and full of oxygen. As long as you don’t have too many fish in your tank, you only need to change the water once a week.

If you have any questions about how to change the water, just follow the steps we’ve provided in this article and feel free to leave a message if you still need help.

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