5 Common Aquarium Fish Diseases and How to Treat Them

5 Common Aquarium Fish Diseases and How to Treat Them

In addition to the problem of choosing the right aquarium fish, the care and elimination of common diseases in aquarium fish are also of interest to many aquarists. So what are the common types of braids in aquarium fish and how to fix them, read our article below!

white spot disease

White spot disease is a parasitic infection that most aquarists deal with from time to time. White spot disease kills more fish than any other disease. This disease mainly occurs in aquarium fish due to close contact with other fish and the stress of living in the aquarium, unlike fish that live in open water. Ich disease can occur in both saltwater and freshwater tropical fish, requiring different methods to treat and manage the fish ecosystem and habitat.

The most obvious sign of white spot disease in the aquarium is the appearance of small white spots like salt particles, hence the name white spot disease. Common signs of white spot disease in aquarium fish are:

  • Excessive movement. Fish may rub against the plants or rocks of the tank more in an attempt to dislodge parasites or cause itchiness.
  • Closed fin. Fish always close their fins close to themselves instead of spreading freely.
  • Heavy breathing. If the fish come to the surface to grab a bite or often hang around the filter in the tank, they are probably suffering from a lack of oxygen. The ich parasite clings to the gills of fish, making it difficult for the fish to absorb oxygen in the water.
  • Anorexia. If the fish does not eat or spits out food, it is a sign of stress and illness.
  • Hidden behavior. Animals often hide when they feel sick and any change in behavior is often a sign of stress or illness. Fish may hide in decorative objects or may not be as active as usual.
  • White spots are present on the body and gills of the fish. These spots can clump together to form white spots. Sometimes white spots appear only on the gills of the fish.

You can find white spot treatments for fish at most fish stores. Use the medicine as indicated on the bottle, but do not pay attention to the cure time: there are always 2 life cycles of the parasite. Garlic is also believed to be a good preventive and curative measure. It should be noted that salt has little effect on parasites, but it can help increase the resistance of fish skin to parasites (increase the slime layer).

To treat fungal diseases in aquarium fish, you can bathe the fish with salt water or use an antifungal drug containing phenoxyethanol. In some cases, it is necessary to treat all of the fish in the tank, but if several individual fish are sick, those individuals can be removed for separate treatment. Using antifungal and antibacterial medicines containing gentian violet to apply to the fish fungus is also a good choice of treatment.

eye disease

Fish eye disease is one of the common diseases in aquarium fish. Protruding eye disease in fish in general and ornamental fish in particular is caused by the bacterium Steptococcus. This bacterium thrives in environments where the water temperature is 20 to 30 degrees Celsius.

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As for signs of illness, fish will show signs of disorientation while swimming. Eye damage such as eye inflammation, protrusion, eye bleeding. The appearance of sores around the eyes. The fish stopped eating. Polluted water environment due to poor filtration system. You should use an overflow filter to keep the water source cleaner. You are buying fish with pathogens from places that are not reputable or unknown, such as street peddling fish. You should choose to buy fish from reputable stores so that you can buy healthy fish that does not carry diseases.

The manifestation of aquarium fish with bulging eye disease is that they cannot keep their balance when swimming, often rolling over to the side, drifting downward, swimming with their head up or tail down. high. The fish bladder is a gas-containing organ, which helps fish swim and balance in water by regulating the air pressure inside. The cause of common bubble disease in aquarium fish can be: The internal organs of the fish are born with birth defects. Constipation (this disease will cause the gas bubbles to grow): due to the fact that the fish swallow air at the surface of the water when they eat or too much air in the pellets, especially floating kibble. Bacterial or parasitic infections can also be associated with bullous disease.

For ornamental fish with protruding eyes, attention should be paid to regular cleaning of the aquarium. When buying fish, before restocking, you need to bathe in 2-3% salt water for 5-15 minutes. Should be stored with moderate density. When buying fish, before restocking, you need to bathe in 2-3% salt water for 5-15 minutes. When disease occurs, part or all of the fish food should be cut off. Prepare a healing aquarium (which is an aquarium with a volume of about 15-20 liters of water). Drain the water from the main tank to the healing tank. 10 drops of methylene blue, 1 tetra (antibiotic) tablet, effervescent cap, 1% salt. Everyone, multiply the medicine by the ratio of water. The next day, change 2/3 of the water and use the medicine until the swelling subsides, then stop.


Fungi are one of the most common diseases in tropical aquarium fish. Because fungal spores are found in aquariums, it is these spores that enter fish and cause disease when fish are stressed, injured, or sick. Poor water quality can also be the cause of increased fungal infections of fish in the tank. Some types of fish are susceptible to fungi such as grouper, koi, neon fish, etc., which need to be taken care of.

The cause of fungal diseases may be fish carrying pathogens from outside the aquarium shop, because the aquarium is not clean, or because the fish is injured or suffers from other diseases… Most fish keepers recognize the outward signs of fungal infection. Most fish infected with fungal diseases are white in color (called white fungal disease in aquarium fish). These fungal cells attach themselves to the skin of the fish and gradually spread to the adjacent skin. If left untreated, the fish will either stop eating or eat without digestion, without stress…. When a severe fungal infection is left untreated, the fish weakens and dies. When the water source in the tank is infected with fungal cells, you can easily see that the water is cloudy, there are brown and white fungal scales that look like moss clinging to the tank glass or plants grown in the tank. In addition to white fungal disease, there is also red fungal disease in aquarium fish.

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Intestinal diseases

When fish have intestinal problems or white stools, bloating, fish often hide in a corner and refuse to eat. The belly of the fish swells for 5-6 hours without collapsing, and there are white threads extending from the anal opening. There are many common causes of intestinal disease in aquarium fish, the most common being rancid food left too long. either because the food was not thawed, or because the sudden change in the water environment caused the fish to electrocute.

This aquarium fish disease is very difficult to treat because the parasite that causes the disease has 3 life cycles. During the larval and adult stages of the parasites, fish slime and their mucus in turn protect them. The only curable stage of aquarium fish disease is the follicular stage (they are free-swimming in water). You must treat the fish for 4 weeks or for their 2 complete life cycles.

Increase the temperature to promote their life cycle and reduce the healing time of aquarium fish. Copper sulfate (0.15 – 0.20 ppm) can be used to treat and prevent flare-ups. Medicines for ornamental fish are malachite green, formalin and methylene blue. If using Malachite Green and Methylene Blue, use as directed.

Intestinal diseases in ornamental fish should be cured, not cured immediately, and should use the correct method and the correct medicine. First, turn on the oxygen heater to support the fish’s respiration, then use Metronidazol under form of tablets, one tablet for aquarium fish is used with 15 liters of water. After 24 hours, do a 30% water change and add 1 capsule. During this time, absolutely do not feed the fish because the stomach of the fish is still very weak, which can easily worsen its condition.

bubble disease

To cure your aquarium fish with bubble disease, stop feeding the fish for 2-3 days. Then increase the water temperature and make it easier for the fish to swim by lowering the water level. The increase in water temperature will aid digestion and help avoid constipation. Use commercially available antibiotics if necessary. You can find a wide variety of antibiotics for cystitis here.

If the condition of the fish does not improve, the problem is not with the bladder of the fish but with another part or the infected fish. At this point, what you need to do is call the fish doctor for timely advice and treatment support. To prevent bubble disease, keep the tank clean and follow a regular schedule of aquarium water changes. Also, you should pound and soak the food before feeding it and avoid overfeeding it.

Above is some information about aquarium fish diseases that aquarists often encounter. With this article, Cacannhho.com hopes to provide useful information to help you know and prevent fish diseases. Aquarium fish diseases won’t be hard to deal with if you really care. To find a reputable fishmonger, come see us. With 10 years of industry experience, we guarantee to bring you the best product and service value.