Tropical Fish Diseases, FishTankWeb.Com – Just like on other fishes, tropical fish diseases attack the fishes with low body immune.

Being healthy and leading a peaceful life is the ideal environment for the fish.

However, newly bought fish in a big tank could cause commotion and develop a high level of stress.




Starting from this point, your fish are on the red zone of illnesses.

Tropical Fish Diseases and Symptoms

Tropical Fish Diseases Fungus

Image Photo of Bettas Tropical Fish Diseases Fungus PicturesThis malady cannot be spotted until it is in the dangerous stage. Fungus starts with bacterial infection named Saprolegnia.

It grows on the area with dead tissue. In the other words, fungus is the sign of very sick fish. You will see white or gray cotton-like thing growing on the skin.

Without treatment, the bacteria will continue to spread on the skin and eat the fish from the outside. It could also be found in the fin.

The whitish cotton appears in the injured area, commonly as the result of fighting. It is just as dangerous as the skin fungus: decaying the fin tissue.



Diseases Fungus Treatments:

To reduce the pathogen, you can change the water and raise the circulation. Saprolegnia grows well in water with no flow.

In several cases, improving the water quality eliminates all pathogens in the tank. Since this malady is contagious, you are recommended to isolate the sick fish.

In the pet store, you can easily find the fungus medication. The composition includes fungicide and antibiotics.

You can ask for further information to your vet about the suitable brand for your fish.



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Remove the filter carbon, as it neutralizes the drugs. One tablet should work for five gallons of water. Continue the treatment for at least five days.

Tropical Fish Diseases White Spot

Image Photo of Tropical Fish Diseases White Spot Problem PicturesAnother name of this disease is Ich. This is the most common problem for fish collector. You will see white spots on the body surface on the fish.

It is the sign of these pathogens: Ichthyophthirius multifiliis (FW) and Cryptocaryon irritans.

The affected fish will rub its body against the aquarium glass or have attached fin.




When the infection reaches the gills, the fish will gasp for air. The fish bought from the street vendor has high infection risk.

It has lived in a horrible surrounding for quite a long time: from the ocean, the seller, and then you.

The changing temperature and water pH in relatively short time may also be the problem.

White Spot Treatments:

Do not delay the treatment. If you notice the white sandy texture on the body, immediately isolate the affected fish.




In a week without treatment, the condition will be worse. Take off the filter carbon and all the decorations inside the aquarium. Change the water and vacuum the dirt every day.

Increase the temperature every several hours gradually to 86 degree Celsius at the maximum. Pair up the medication with aquarium salt to help the gill treatment. Repeat the process until all the spots disappear from the body.

Tropical Fish Eye Diseases

Image Photo of Tropical Fish Eye Diseases Cloudy Eye Preventing Pictures
cloudy eye

There are two popular eye diseases for fishes: popped eye and cloudy eye.

Both are caused by stress, bacterial infection and numerous unidentified organisms.

For popped eye, you will see that one or both eyes are protruded in an unfamiliar way.

Image Photo of Tropical Fish Eye Diseases Popped Eye Pictures
Popped Eye

The condition is called exopthalmos, as the result of liquid and fluid accumulation in the infected orbit. Your small pet will slowly lose the vision.

Cloudy eye relates to severe stress, old age and also the malnutrition.

There will be some kind of white or gray membrane, covering the fish’s eyes. It will lead to blindness.

Fish Eye Diseases Treatments:

The treatment attempt for cloudy eye and popped eye should include changing the water to make sure you have clean water.

Check again whether your fish gets proper nutrition. The condition should be better after changing the water.

If after a week your fish is not progressing well, consider to give antibiotics.

Both maladies are the side effects of ammonia, nitrites and nitrates concentration in the water.

These substances cause irritation to the eyes, which becomes worse and develop to further stage.

After the treatment session finished, keep changing the water frequently. There will always be chances for the infection to strikes back.

Swim Bladder Disease Tropical Fish

“Balloon” type fish such as Bettas and Goldfish are the most common victim of this malady.

However, the other species also hold similar chances of getting infected.

Image Photo of Swim Bladder Disease Tropical Fish Symptoms PicturesYou can identify the system when a fish cannot swim properly, struggling to keep its balance, and stay mostly on the bottom of the tank.

The belly is also bloated, as the result of growing internal organ.

As written in the name of the disease, the swim bladder cannot function properly. For balloon species, the cause is abnormal digestion or low fiber diet.

If the condition happens in other species, bacteria are the suspected cause. Careless handling might also be one of the reason.

Transferring the fish to new tank should be done slowly instead of sloppily.

Swim Bladder Disease Treatments

The way you cure this fish is varied, depending on the species. In some cases, isolation for a week on a tank with aquarium salt will make the aquatic pet better.

Some successful story shares that measuring high fiber diet also helps during the recovery period. For worst cases, vets suggest to take antibiotic.

It is good to know that this condition might also happen because of premature or early birth. If the body has unusual shape, then swim bladder cannot be cured.

Fin Rot Tropical Fish Diseases

Just like how you read it: the infected fish has shredded tail and fins. The scale color will not be bright and shiny.

Image Photo of Fin Rot Tropical Fish Diseases Treatments PicturesEspecially if you have multiple species of fishes in one tank, there will be one “target” of fin nibbling. It may also happen because of fish fighting.

The injured fin gets worse and lead to fin rot. Arranging the tank poorly makes the condition worse. For a solitary fish, the main reason is fungus infection or ich.

If your tiny fish get tuberculosis, fin rot will automatically follow. The sick fish will look very ill, swim less and make the bottom its home.

Fin Rot Treatments:

First recovery step to do is determining the cause of fin rot. Take a look at the water level. Make sure you put the appropriate water into your tank.

Too little water will make the fish stressed. If adjusting the water does not work, then try your luck with maintaining good nutrition proportion for your fish.

Proper amount is totally different from over feeding. The next option is to add the medication for bad organism such as bacteria.

Do not forget to add antibiotic like chloromycetin (chloramphenicol) or tetracycline. Mix this drug in the food.

Dropsy Tropical Fish Diseases

It is a condition where the fish scales are pointing outside, resembling a fighting rooster. You can observe this sign from top of the aquarium.

Image Photo of Dropsy Tropical Fish Diseases Symptoms PicturesThe body is also swollen, raising the drowsiness and less appetite.

The culprit is bacteria from dirty water in the aquarium and also internal organ dysfunction.

It infects the kidney, causing accumulated fluid inside the body.

In certain dropsy stadium, it also indicates internal organs failure. Sick and stressed fish are prone to this malady.

Even though it is not easily spread to the other fishes, secure isolation area is required.

Dropsy Treatments:

The best attempt to recover is by antibiotic consumption. Make your fish starve then feed them fish food mixed with antibiotic Maracyn-Two.

This way, the fish will eat the food before the drug dissolves into the water. If your fish refuses to eat, then put 10mg of antibiotic for 5 gallon of water.

Do not forget the aquarium salt: 1 tsp per water gallon. The treatment may last for weeks. During this period, change the water every day.

Some people prefer to do euthanasia to the fish before it spreads to its friends. Why? Because most of the time, the obvious symptoms say that the survival possibility is low.

Tropical Fish Diseases Diagnosis

New environment could make the fish stressed. They include water changing, new fish and also the pH level. For the sake of your loving pet, you need to monitor it every day.

Once you notice something wrong, you could prevent worse finish line. Learning about tropical fish diseases shows how much you care of it.


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