How to treat cloudy eyes in betta fish?

In this post, we will answer the question “How to treat cloudy eye in betta fish?”. We will also discuss some cloudy eyes possible causes and how to prevent them.  

How to treat cloudy eyes in betta fish?

There are some treatments you can try to use before taking your betta fish to the veterinarian, they are:

• Check your water quality and, if necessary, enhance it. 

• Examine your fish’s surroundings for sources of trauma, such as physical injuries, and try to heal them. 

• Provide a healthy, well-balanced diet. 

Betta fish are sensitive to water conditions and stress, but even when given the finest possible care by their owners, they might become ill. 

Betta fish are prone to a condition known as the cloudy eye. That’s terrifying for you, and it’s also upsetting for your cat. Cloudy eyes in bettas are discussed in detail in this thorough guide, including the causes, treatments, and how to avoid the condition in the first place. 

What is a cloudy eye?

Cloudy Eye is a sickness that causes the lens in your betta’s eye to become opaque, resulting in a cloudy appearance in your pet’s eyes, hence the name. Cloudy Eye in your pet is often treatable, and your fish should make a full recovery, depending on the cause. 

However, because the ailment can have a variety of reasons, it’s critical to figure out what’s causing the problem to discover the most effective treatment.

Is it contagious to have cloudy eyes? 

The cloudy eye isn’t usually communicable to other fish in a community setting, although it depends on the source of the disease. If your betta has congenital cataracts, for example, none of the other fish in the group will be harmed. 

If, on the other hand, the issue is poor water quality or malnutrition, you must move swiftly to address the situation, using the steps outlined above. Also, if you find a lot of fish with wide eyes in a group, it could be a sign of parasites or another condition that you should cure with over-the-counter medication.

How to treat cloudy eyes?

First and foremost, if your betta fish is kept in a tank with other fish, it should be moved to a quarantine tank. 

Once your fish has been moved to the quarantine tank, add a little amount of aquarium salt that has been dissolved in a small amount of tank water. One spoonful of salt per five litres of water is required. Add some stress coat water conditioner as directed by the manufacturer to help your pet relax and build up its slime coat. When doing partial water changes, remember to replenish the stress coat and salt. 

Carry out some partial water changes on your main tank while your betta is in the hospital tank. The more space you have in your aquarium, the less water you’ll have to replace. So, if your betta tank is 5 gallons, change half of the water every three to four days. Only change 25% of the water every three to four days if the tank is 10-gallons.

Causes of cloudy eye

Internal parasites

Internal parasites, such as flukes and protozoa, can attack your betta at any time. These parasites are most commonly seen in wild fish, but they can be introduced to your home aquarium by hitching a ride on plants or with live food. As a result, you should always wash whatever you add to your aquarium in an antibacterial and antiparasitic solution before putting it in. 

Infected fish acquire clouded, enlarged eyes, which can sometimes include microscopic worms. Affected fish typically lose vision in one eye and may develop a cataract in that eye. 

Unfortunately, while the parasites can be killed by treating the aquarium water, your betta cannot be healed once the harm has been done, and Hite will stay blind.


Fish, like humans and other pets, can get cataracts. Cataracts are a common eye ailment that causes the lens of the eye to become opaque and cloudy, especially in older bettas. 

Parasites (see above), hereditary causes, or improper diet can all induce cataracts. Cataracts in fish do not respond to treatment.

Bacterial infection

Your betta’s tank must be free of sharp or abrasive things. Tank decorations should be smooth, and if you don’t want to use actual plants, soft silk plants are preferable to plastic ones. For your curious betta, everything pointy is a potential source of injury. 

Injuries to the eyes are a common entry route for bacteria, which can produce an infection, which can result in permanent eye damage, vision loss, and cloudiness. If you catch the injury early enough, you might be able to salvage your betta’s sight. To heal the infection, place your injured betta fish in a quarantine tank and treat the water with a unique antibiotic.

Nutritional deficiencies

If you want your betta to stay healthy, vibrant, and thriving, it needs to eat well-balanced food. Any nutritional inadequacies, such as a deficiency in vitamin A, can harm the health of your fish’s eyes. 

As a result, make sure your betta is eating a well-balanced diet that includes high-quality tropical flakes, betta micro pellets, frozen meaty snacks, and rehydrated freeze-dried bloodworms.

Poor water quality

Poor water quality is by far the most prevalent cause of Cloudy Eye in aquarium-kept fish, especially when the pH falls too low. 

Even one betta fish in a tiny betta tank or bowl produces a lot of waste, and acids are one of the by-products of biological filtration. Acidity causes the pH of the water to drop over time, which can create health issues in your pet, including Cloudy Eye. 

The answer to the problem is simple: test the water in your aquarium regularly. If the pH falls below 6.8, make more regular water changes and test the water every day for a few days to ensure the pH stays stable. You should also test your tap water before adding it to your tank, as you may need to add a pH buffer treatment as well as a dichlorinator. 

Your fish’s eye problem should clear up without any further intervention or irreversible harm once the low water quality issue has been remedied.

How do I prevent cloudy eyes?

The easiest technique to prevent cloudy eyes in your betta is to ensure that the water quality in your tank is good. The key to bettering water quality is to keep ammonia and nitrite levels at 0 ppm and nitrate levels below 20 ppm.

How do betta’s eyes work?

Let’s learn more about how the fish’s eyes operate before we discuss the reasons for cloudy eyes and what you can do to treat them. 

Often, your betta will become unwell for no apparent reason, and you will be unaware of the situation until it is too late. The early warning indications of fish diseases, on the other hand, can often be seen in your betta’s eyes, particularly if the shape, clarity, or colour of the eyes changes. Many early indicators of sickness appear more clearly on the transparent tissue of the eyes than on the creature’s body, and aquarists can benefit greatly from learning how these optical changes can be utilized to recognize and diagnose illness in their bettas.

How does your betta use its eyes?

The eyes of your betta friend work similarly to the eyes of most creatures: 

–       Light enters the eye

–       The pupil focuses it;

–       The light falls onto a receiver, which generates a picture;

–       The image is interpreted by the fish’s brain. 

The specific gravity of water differs from the specific gravity of air. As a result of its adaptation to living underwater, a fish cannot see clearly outside of the water. The betta’s eyes are located on the sides of its head, allowing it to look to each side of its body, as well as practically straight behind and in front of it. However, the fish’s inability to understand two independent images at the same time indicates that it lacks depth perception. The majority of fish species, including bettas, lack eyelids. This might cause injury to their eyes, which is one of the main reasons why you should never put sharp objects in your betta’s aquarium. 

Predatory fish, like bettas, require a certain level of depth awareness to see their prey. To compensate, the betta’s eyes are positioned somewhat further forward on its head. Using two nets and coming from two separate directions at the same time, you can take advantage of the fish’s poor depth perception. 

Blindness in wild bettas is a death sentence for the fish, as they will be unable to search and locate food. This does not apply to your betta in a tank, though you may need to hand-feed it to ensure it gets enough food.


In this post, we answered the question “How to treat cloudy eye in betta fish?”. We also discussed some cloudy eyes possible causes and how to prevent them.  

If you have any thoughts or doubts, feel free to drop us in a comment below!

Frequently Asked Questions (FAQs): How to treat cloudy eye in betta fish?

What causes fish to have cloudy eyes? 

Poor fish eye health may be caused by dietary inadequacies, such as a lack of vitamin A. Poor water quality appears to be the most prevalent cause of cloudy eyes in aquarium fish, especially when the pH level in the aquarium water dips too low. 

What is the best way to deal with cloudy eyes? 

A cataract-clouded lens can only be treated by surgery to remove the lens and replace it with an artificial lens. If the cataract is not treated, it will worsen and finally cause blindness in the eye. 

How can I determine if my Betta is blind?

It’s conceivable that your betta is getting blind if a grey or opaque film is covering its eye. Mucus is also likely to build up when your body tries to fight whatever infection it is fighting. As a result, you’ll notice that its vision is hampered, and it’ll have difficulty swimming and finding food. 

Is it possible for fish eyes to regrow? 

The nerve is irreversibly damaged, and visual loss is irreversible. Fish, on the other hand, can rebuild their optic nerve in as little as 12 days and regain their vision in as little as 80 days following an injury. 

Is it possible for a fish to go blind? 

Cataracts: Cataracts, a common eye illness in which the eye lens becomes opaque, can also affect fish. The fish will usually go blind in the diseased eye and may also acquire a cataract. Eye flukes, unfortunately, do not have a treatment. 

What should I do if one of my fish’s eyes is becoming cloudy? 

Cloudy eyes can be caused by a variety of factors. Pinkeye or bacterial infections are two common causes of clouded eyes in fish. Other causes include parasites from another pet coming into contact with the tank water, too much light for certain species, ichthyosis or hypersensitivity from overeating or overstocking that leads to exposure to ammonia and nitrate toxicity, fungus (Atrichophyton sp. ), organ failure/swelling due to anemia caused by a variety of factors, including medications like ethoxyquin and chloroquine – conditions that promote other problems like.


Betta Cloudy Eye Guide – (Cure Your Betta)

Fish Cloudy Eyes.

 Song, M. (2006). Caring for Betta Fish. Lulu. com.