6 Guppy Fish Diseases their Symptoms, Causes, and Cures

6 Guppy Fish Diseases their Symptoms, Causes, and Cures

guppy fish diseases

Guppy fish is one of the most popular freshwater fish among the beginners as well as among the experienced aquarists. The probable reason behind this popularity is its glowing colors and, of course, its hardy nature – specifically, it’s tolerance of different water temperatures and pH.
Due to this, a few aquarists are often ignorant of the water parameters, and the cute looking Guppy may fall sick even after being a hardy fish.

Why Curing Is Mandatory?

These diseases not only affect the health of the fish but also the look of the fish too is affected much. You definitely do not want to see a dull-looking Guppy in your aquarium!
Most importantly, the germs of the diseased fish may impact the health of its tank mates. For example, a diseased Guppy may affect healthy Tetra, Molly, or Platy. So, curing is mandatory.

Common Guppy fish diseases and their Control

That’s why we are showing six commonest diseases of Guppy fish and their symptoms, causes, and remedy so that you can save your Guppy fish.

1. Ich/White Spot Disease

Ich is a parasitic disease that is commonly referred to as white spots which affect the gills of your fish to reduce respiratory function and intake of oxygen grom tank water.


  • Small to large white spots cover the body of Guppy fish.
  • Lack of/no appetite and Guppy will rub its body on the substrate or décor.
  • Overall uncomfortable movement is seen in the Guppy.


Ichthyophthirius Multifilis, protozoa, creates small white lumps in Guppy’s body. Whenever these fall in the water, a huge number of parasites come from them, which is a reason behind this disease. Poor quality water (mismatched temperature and pH) is also a reason as such parasites and protozoa grow in improper water.


  • Clean the tank to release the parasites.
  • Adjust the water parameters as per the requirements of Guppy.
  • Add aquarium salt (as per the advice of experts).
  • Use Formalin or Malachite Green to kill the parasites.

2. Dropsy

Dropsy is another disease which is caused due to fluids that build inside the body. It leads to the following things that are liver failure, parasitic or bacterial swear infection.


  • Swollen belly of Guppy.
  • The fish has no appetite at all.
  • Loose and unstructured scales.


Poor quality fish food and bacteria that grow in poor quality water are the reason behind this disease.


  • Separate the fish right after spotting the signs of dropsy and place the fish in a quarantine tank.
  • Get expert’s guidance immediately as dropsy is generally spotted at a late stage when it becomes much difficult to save the fish.

3. Swim Bladder

Swim Bladder is referred to as fish maw, air bladder, oxygen bladder or gas bladder in fish. It is most common in goldfish. The fish start floating on the surface of the water and unable to swim properly in water.


  • Guppy swims upside down or keeps tail high while swimming.
  • A curved structure of the spine, as well.


Low water temperature and over-eating is the main cause of swim bladder disorder in Guppies. Parasitic infection or other infection may intensify the problem.


  • Let the Guppy fish fast for three days and feed a boiled pea on the 4th day.
  • Reduce water flow and increase the temperature.
  • Add aquarium salt.

4. Fins or Tail Rot

Fins rot is a common disease in many freshwater or pond fishes like betta fish. It is caused by bacteria in most cases. In this disease, fish fins are rotten and damaged.


  • Parts of fin or tail of the Guppy may fall.
  • Fins or tail look discolored.
  • Clotted blood is seen in the edges of the fins.


Aggressive tankmates may nip the fin or tail, which is the main cause of this disease. Bacteria of low-quality water can worsen the situation.


  • Apply antibiotics (these are easily available).
  • Weekly water change is necessary.
  • Selecting compatible tank mates can solve the problem too.

5. Gill Flukes

Gills Flukes is the most common disease, especially in koi fish. It is happed due to Gill worm. It affects the gills of fish.


  • Fish swims in a very hurried manner.
  • Fish may rest on the substrates, keeping the gills opened.
  • Breathing trouble may occur in the Guppy.
  • Swollen and discolored/blood patched gills can also be seen.


Poor quality water or specifically chlorinated water is the reason behind gill flukes.


  • Dechlorinate the water.
  • Weekly change one-third or one-fourth water.
  • If these do not work, consult an expert and apply medications.

6. Fungus

Fish fungus or Saprolegnia fungus infects fish eggs or fish body especially internal parts and inner tissues. Also, It is observed in mollies, goldfish and more


  • White cottony growth is found on the fins of Guppy.
  • The discoloration of scales and fins and tail is an added sign.


Extremely cold water gives rise to the fungus, and it mainly attacks the weak or sick fish first.

Treatment: How to get rid of fish fungus?

  • Anti-fungal medicine can serve well, but be sure to get the guidance of the experts.
  • Replace two-third aquarium water with dechlorinated water as soon as possible.
  • Increase the temperature gradually to make the Guppy comfortable.
  • Adding some aquarium salt can help too.

Experts Suggestion:

Along with these curing tips, it is always advisable to

  • Get the experts’ guidance (especially before applying medications or making any major adjustments) to provide your aquatic buddy a longer life.
  • Be an extremely good observer so that you can understand the signs of diseases in the Guppy fish at an early stage to provide the proper treatment.
  • Place the fish in an uncrowded or less crowded tank temporarily to reduce their stress and help them to dazzle.

As you see, most of the diseases are caused by poor quality water and the bacteria or parasites of the poor quality water, and you have to maintain the water parameters. It’s definitely not that difficult to raise Guppy fish healthily, but a little care is needed to help this fish to shine even more brightly in your freshwater aquarium.

Interested in knowing more about guppies?

Flora is a Fish Parent & Enthusiast for over 10 Years. She has Deep Love & Affection for Fish Keeping. It's become her Passion to Help others. Stay Tuned with her Blog to Know more about Pet Care Tips, Product Reviews, and Guides. If you've anything Interesting to Share about your Fish. She'd Love to Know.