Recognize and treat aquarium diseases

At any time, ornamental fish in your aquarium may become ill and need your help. A quick recognition of the disease patterns is of course indispensable for the treatment. One of the most common reasons for aquarium diseases in your tank is an inappropriate husbandry of the animals, be it through too high stocking, wrong water temperatures or not optimal water values. However, a monotonous diet that does not meet the needs of the fish can also weaken the immune system of your fish, making them easily susceptible to aquarium diseases. This article deals exclusively with the diseases that can affect your aquarium inhabitants. Do you struggle with cloudy aquarium water? My article on how to get rid of cloudiness in aquarium water can help you get rid of the problem.

In addition, new fish added to your tank can quickly introduce disease to your aquarium. When choosing your fish at the pet store, you should therefore always pay attention to the external integrity of the fish and their behavior. Once diseased fish have unintentionally entered your tank, conspecifics can quickly become infected.

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A number of diseases can be recognized early by clear symptoms of the fish. In the case of other aquarium diseases, the symptoms are unfortunately difficult to recognize, especially in the early stages, as they can be quickly overlooked on the surface. In addition, with some fish diseases, in addition to physical and external characteristics, one can also observe conspicuous behavioral changes.

White spot disease

Symptoms: In this disease, white spots no larger than 1.5 mm spread over the entire body of the fish. Similarly, increased violent breathing movements and, and the fish chafe on the substrate or decorative items in the aquarium.

The fish are infested with unicellular skin parasites.

In the pet shop there is a large selection of suitable Medication mostly based on malachite green oxalate. The dose specified in the manufacturer's instructions as well as the total duration of the therapy period must be adhered to in any case.

Fins rot

Symptoms: Fish suffering from fin rot have a frayed and ragged looking fish fin, some of which may even have bloody areas at the base of the fins.

Cause: The fin rot is a disease caused by bacteria.

TreatmentThe bacterial disease must be treated with a prescription antibiotic. Prescriptions for these aquarium diseases can be ied by any local veterinarian.

Hole disease

Recognize and treat aquarium diseases

A common aquarium disease: the hole disease

Symptoms: Small to large hole-like cavities on the body of the fish that give the appearance that the fish has been eaten.

Cause: White spot disease is a skin disease caused by unicellular parasites.

TreatmentAnimals infected with pitting disease are difficult to treat. In part, a vitamin-rich diet that is precisely tailored to the needs of the animals helps. The effectiveness of medications for these aquarium diseases is controversial.


Symptoms: Cotton wool-like coatings on the edges of the fins and on the wounds of the fish. The corners of the mouth of the fish are often affected. Also a very common aquarium disease in ornamental fish.

Cause: This disease is a bacterial fungal infection. Heavy breathing paired with strong swallowing movements. Frequent rubbing are typical for this disease. The fish also do not take any more food and become quickly thinner.

Cause: The fish are infested with very small microscopic worms invisible to the naked eye. The fish have protruding scales. A bloated belly. Sometimes there are also clearly protruding eyes and torn fins.

Cause: The fish tuberculosis is a serious bacterial infection.

TreatmentSick fish must be isolated directly from the other inhabitants of the aquarium. Although there is the possibility of treatment with a broad-spectrum antibiotic, the prospects of success are very low. If a fish in your aquarium has fish tuberculosis I would personally advise to put it out of its misery.

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