What to do if my betta fish tank is cloudy?

In this post, we will answer the question “What to do if my betta fish tank is cloudy?”. We will also discuss some causes and symptoms you should check before treating the water.

What to do if my betta fish tank is cloudy?

There are two types of cloudy water to be careful of: the first is white/grey in color and seems foggy in appearance, making it difficult to see in the tank at times. The second type of cloudy water is yellow in color and appears hazy in appearance. Green is the other variety. There is a common symptom in both situations. 

– Leaving things alone 

– Increase the number of healthy microorganisms in your system. 

– Don’t overstock your tank 

– Change the water regularly 

– Keep your filter in place 

– Reduce the quantity of light that enters the room 

Cloudy water, believe it or not, can have more than one symptom. By carefully studying the signs, you will be able to choose the best course of action for the tank. If you group everything, you risk mistreating the water. This could aggravate the situation and make it more difficult to view your betta. 

Rapid appearance and disappearance 

The speed with which foggy betta tank water forms and then vanishes is one of the most typical symptoms. You could go to sleep with a clear tank one night and wake up to misted water the next. Then you may go back to sleeping with cloudy water and waking up to crystal clear water. 

Various colours 

The hue of cloudy water in a betta tank will vary based on what is causing it. It will be either white/grey or green. Both have different causes, which you will learn about soon. And they’ll need to be treated differently. 

Visibility at various levels 

Finally, varying amounts of visibility can be expected. It may occasionally be nothing more than a light haze that you may see right through. In some cases, though, it may be difficult to see through the cloud at all. This may make you feel anxious, but don’t get too worked up over it just yet! 

What causes fish tanks to become cloudy? 

You should now be aware of the most prevalent ways that cloudiness can influence your betta tank, as well as the causes. Consequently, you will not be able to exert complete control over them. However, there is generally something you can do to avoid them.

A number of variables contribute to the cloudiness that appears white or grey in color. Green cloudiness is less common than white and grey cloudiness. In this case, there are several aspects that play a role. Here are a few of the most typical reasons why this happens.

Filthy gravel 

If you’ve recently added fresh gravel to your tank and notice that the water is cloudy, it’s most likely due to the gravel. This happens in new tanks because the gravel hasn’t been thoroughly cleansed. 

After having your gravel in the tank for an extended period of time and moving it about excessively, the same thing might happen. As your tank gets older, a lot of little particles will settle to the bottom. When you disrupt the gravel, it releases all of the silt that has accumulated in the tank. 

Bacterial bloom

One of the most prevalent causes of cloudy water in a betta tank is overcrowding. However, not all bacteria are hazardous. This form of cloud does not appear instantaneously; in fact, it can take months for the bacteria to flourish to the point where the water becomes cloudy. 

They don’t rule out bacterial blooms, though, if it happens soon. They can also happen quickly when you first fill your tank with water. 

Changes in water quality 

It is possible for the water in your tank to get foggy when the water parameters in your tank change. This is due to bacteria in your tank once again. As the bacteria in the tank begins to multiply again, it may become cloudy and white. 

Cloudiness in the colour green 

If your tank has turned a cloudy green colour, you’ve probably figured out what’s causing it. seaweed This can happen even if there aren’t any algae on the tank glass. If you’re seeing green cloudiness produced by algae, these are a few of the most typical causes. 

In the tank, there is too much light. 

Light is something that algae adore. If your light is excessively bright or you leave it on too long, it may be creating more algae development than typical in your tank. It isn’t even necessary for it to be the aquarium light. If your tank is placed next to a window or if the lighting in the house are left on, algae can begin to bloom.

Phosphates in excess 

This is another prerequisite for algae to thrive. It is possible for phosphorus to infiltrate your tank through a multitude of means. The most prevalent cause is the decomposition of food and garbage. The other source is straight from the water you’re drinking. If you have a suspicion that this is the case, it is worthwhile to put your hypothesis to the test. It’s also possible to purchase bottled water that is specifically designed for bettas.

So what can I do if the water in my betta aquarium is cloudy?

It’s not difficult to clear cloudy water in a betta aquarium. Moreover, if you follow the instructions to the letter, you’ll be greeted with an immaculately clean tank. Here are a few ideas for how to go about it. 

Leaving it alone 

The greatest thing you can do in most circumstances is to be patient and wait for the problem to go away on its own. You can use a variety of cleaners and medicines, but in many situations, they will simply make the situation worse. It’s sometimes preferable to just sit and wait. 

Cloudiness is a common sign that a tank is establishing itself. Only when it persists for weeks at a time should you explore an alternative strategy. 

The only time you should resist just leaving it is if you know what’s causing it. It’s important to wipe up any spills immediately if you feel they are caused by the gravel or other decorations. 

Make a conscious effort to increase the amount of beneficial bacteria in your system 

Another excellent step is to increase the number of bacteria in the tank. Various approaches can be used to accomplish this. It is possible to start with an existing biological sponge from another filter to get things going. In addition, you may purchase pre-made bacteria cultures to add to the tank for a little fee. Adding this beneficial bacteria to your tank will assist to balance it out. 

Make sure your tank isn’t overflowing 

Make sure you’re not stocking your tank with too many fish at once. As a general rule, one inch of fish per gallon of water is the recommendation. When you think of tropical fish in nature, you won’t see them all jammed into one small place. As a result, you should refrain from doing so in your tank as well. 

Nonetheless, if you’re keeping your Betta alone, this shouldn’t be a problem; however, you shouldn’t keep your Betta any smaller than a 5-gallon tank.

It’s also crucial not to overfeed your fish, in addition to not overstocking your tank. Any food that isn’t consumed in the tank will encourage the growth of germs. 

And don’t be concerned about the fish becoming overly hungry. Fish, unlike humans, do not require three meals per day. Some experts recommend that you fast your betta once a week to keep him healthy.

Change the water regularly

In addition, you should replace the water on a regular basis. The amount of change you make is determined by the size of your tank.For those who aren’t sure how much they should change, 10-15 per cent every week is a good spot to start experimenting.

By removing some of the germs in your tank, changing your water regularly will benefit your filter and your tank. Furthermore, it will dilute any hazardous bacteria and phosphate accumulations! 

Keep your filter in place 

Last but not least, ensure sure your filter is up to date. It may be time to clean it if you discover it isn’t working as well as it once did. 

You should also clean the filter media regularly to ensure that nothing bad has accumulated. 

Reduce the amount of light that is available in the area 

If your tank has cloudy, green water, you should limit the quantity of light it receives. In the presence of light, algae grows rapidly, and if you have too much of it in your tank, it will quickly overrun the limitations of its container.

If required, you may need to cover your tank with a towel for a day or two to ensure that no light gets into the tank. 

Is it dangerous to have foggy aquarium water? 

Thankfully, murky aquarium water is rarely dangerous. If the problem persists after 10 days, you should take a sample of the water to your local aquatic store. 

It is the sort of water that is cloudy and green that you should be most cautious about. While the algae are not dangerous in and of themselves, the underlying issues may be.


In this post, we answered the question “What to do if my betta fish tank is cloudy?”. We also discussed some causes and symptoms you should check before treating the water.

If you have any questions or concerns, please let us know in the comments section below!

Frequently Asked Questions (FAQs): What to do if my betta fish tank is cloudy?

What is causing the cloudiness in the water in my fish tank?

It’s fairly uncommon for a new aquarium to become foggy after it’s been set up. This is due to the colonization of beneficial nitrogen-converting bacteria that oxidize ammonia and nitrites. Fish waste, rotting plant debris, and unconsumed food are all broken down into ammonia by these bacteria. 

What can I do if the water in my betta fish tank is cloudy?

It’s usually preferable to just wait for cloudy water in a betta tank to clear up on its own. To keep the tank balanced, add more beneficial bacteria, make sure you’re not overstocking it, and conduct frequent water changes. You should also keep your filter clean, vacuum the gravel, and decrease the amount of light coming into the tank. 

How long does it take for a foggy fish tank to get clear?

Beneficial bacteria accumulate throughout this process to eat the ammonia produced, resulting in milky water. This cloudiness is caused by free-floating helpful bacteria that are not hazardous to your fish and should clear up after they settle down, which normally takes 1-2 days. 

What exactly is the problem with my foggy water? 

Generally speaking, aerated water is the most common source of murky water. A minute or so later, if the foggy water in your glass is caused by trapped air, it will naturally clear. As the microscopic micro air bubbles rise to the surface of the water, the cloudiness will gradually dissipate from the bottom up.

How often should Betta water be changed? 

In general, you should replace the water in your Betta’s tank once a week to ensure that it is healthy. Despite the fact that betta fish can tolerate lower oxygen levels in the water than other fish, there are several other reasons to change the water. Betta fish prefers a pH of 7.0, which is considered “neutral.”


Cloudy Water In a Betta Tank – www.bettacarefishguide.com/cloudy-water-in-a-betta-tank-full-guide/

Cloudy Aquarium Water – www.petco.com/content/petco/PetcoStore/en_US/pet-services/resource-center/health-wellness/why-is-my-fish-tank-water-cloudy.html