Guppy Poop: Why Pink?

why does my guppy have pink poop

Guppies are a popular choice for fish enthusiasts, but even the most experienced owners may be surprised to see their guppy producing pink faeces. While it can be alarming, pink poop is usually not a cause for concern and is often the result of diet. If your guppy's food contains red or pink dyes, it may cause their waste to take on a pinkish hue. This is harmless and simply an indication of what they've been eating. However, if you notice any other behavioural changes or if the pink stool persists even after a diet change, it's best to consult a veterinarian to rule out any potential health issues.

Characteristics Values
Guppy poop colour Pinkish-red
Possible causes Parasite, constipation, food colouring
Treatment Quarantine, feed peas, change food


Guppy food colouring

Guppies are omnivores and will eat almost anything, including meat-based and plant-based foods. Their diet can include a variety of live foods, such as brine shrimp, bloodworms, mosquito larvae, and small crustaceans. Guppies will also eat vegetables, such as cucumbers and zucchinis, but the soft parts that can come apart in the water should be removed first.

Commercial guppy food is available in a wide range of options, including flakes, pellets, wafers, and granules. Some commercial foods are colour-enhancing and contain carotenoid pigments that contribute to red, orange, and yellow coloration in guppies. For example, spirulina tablets contain natural carotenoid pigments, which will enhance your fish’s natural colours.

If you want more control over the ingredients in your guppy’s food, you can make your own fish food at home. Homemade fish food can be made by combining fish liver oil, vitamins, spirulina, vegetables, daphnia, fish meal, and bone meal in a food processor and baking the resulting paste in the oven.

If you are concerned about your guppy's pink poop, it may be caused by the colour of its food. If the fish food you're using has red in it, it may be the cause of the pink poop. You can experiment with different foods to see if the colour of the poop changes.



Guppies are susceptible to a wide range of diseases and parasites. The most common parasites found in guppies include:

  • Ich or Ick: This ectoparasite (ciliate protozoan Ichthyophthirius multifiliis) causes white spots on the skin and fins of infected guppies. Treatment involves slowly raising the water temperature to 80°F, adding medication or aquarium salt, and performing a large partial water change.
  • Velvet: This disease is similar to Ich but less common in hobby aquariums. It is characterised by tiny gold-coloured dots covering the body of the fish. Copper medication is typically used for treatment.
  • Protozoan: This tiny parasite attaches to the fish's skin and enters the body through the muscle until it reaches the bloodstream. It is commonly found in unheated tanks with poor water quality. Treatment includes adding a heater to maintain stable water temperature and using medications such as Malachite Green or Formalin in early stages, and copper medicine in more advanced stages.
  • Columnaris and Mouth Fungus: Despite its appearance, this infection is caused by bacteria rather than fungus. It typically forms a large white splash on the fish's mouth or middle body area, causing swimming difficulties and loss of appetite. Treatment options include antibiotics such as Maracyn or Formalin, adding aquarium salt, and potassium permanganate baths.
  • Camallanus Internal Worm: Camallanus is a common parasite in guppies that can reach up to 0.8 inches in length and is visible sticking out from the anus of the fish. It is typically treated with Levamisole for at least 5 days, followed by substrate vacuuming, filter cleaning, and large water changes.
  • Hexamitiasis: This rare parasitic disease in guppies is caused by the protozoan parasite Hexamitia. Infected guppies exhibit pale colours, loss of appetite, and produce white, stringy faeces. Treatment involves using metronidazole (commercially known as Flagyl) through medicated food or applying it directly to the water.

To prevent and manage parasites in guppies, it is important to maintain optimal water parameters, provide a stress-reducing environment, perform regular water changes and tank maintenance, and quarantine new fish before introducing them to the main tank.



Guppies can develop constipation due to a variety of factors, including an improper diet, overfeeding, or a lack of exercise. If left untreated, constipation can lead to swim bladder disease, loss of appetite, and, in severe cases, death.

Causes of Constipation in Guppies:

  • Improper Diet: An inadequate diet, such as feeding guppies bread or low-quality food, can lead to constipation. Guppies should be fed a high-quality diet with a variety of foods, including flake food, daphnia, brine shrimp, and mosquito larvae.
  • Overfeeding: Guppies will continue to eat even if they are not hungry. It is important to feed them the recommended amount and avoid overfeeding. Bloodworms, for example, should be treated as an occasional treat rather than a main meal.
  • Lack of Exercise: Insufficient exercise can contribute to constipation. Guppies require a sufficiently large tank to swim and maintain their activity levels. Additionally, maintaining the water temperature between 72-82 °F (22-28 °C) is essential to ensure optimal guppy activity.
  • Food Allergy: In some cases, guppies may have an allergy to the food they are being fed. Try changing brands or offering a variety of foods to determine if this is the cause.

Symptoms of Constipation in Guppies:

  • Bloated Belly: A distended abdomen is a common sign of constipation. However, it could also indicate other issues such as dropsy or swim bladder disease, especially if the scales are sticking out (pine coning).
  • Lack of Appetite: Constipated guppies may ignore food or spit it out.
  • Lethargy and Reduced Swimming: Constipation can cause guppies to become less active and experience difficulty swimming due to their bloated bellies.

Treating Constipation in Guppies:

  • Fasting: Start by fasting your guppy for 2-3 days to allow any food in the stomach to pass completely.
  • High-Fiber Diet: Introduce high-fiber foods such as blanched peas (with the outer skin removed) to help regulate their digestive tract. Feed the blanched peas for a day, and if there is no improvement, try two more times before moving on to the next step.
  • Epsom Salt: If constipation persists, move your guppy to a quarantine tank and add Epsom salt at a dosage of 1/8 teaspoon per 5 gallons of water. Always follow the instructions on the package and dissolve the salt in tank water before adding it to the tank.
  • Increase Water Temperature: Guppies are cold-blooded, so warmer water can help speed up their digestion. Gradually raise the temperature by a couple of degrees over a few hours.
  • Water Change: Replace 25% of the water in the tank, as poor water quality may be contributing to constipation or other health issues.

Preventing Constipation in Guppies:

  • Review Diet: Ensure you are feeding your guppies a recommended diet specifically formulated for them. Include high-fiber foods and a variety of live foods such as shrimp.
  • Avoid Overfeeding: Guppies will eat continuously, so it is important to feed them only the recommended amount.
  • Provide Adequate Exercise: Guppies need a sufficiently large tank to get enough exercise. As a general rule, provide one gallon of tank water for every inch of fish.
  • Maintain Water Temperature: Keep the water temperature within the optimal range of 72-82 °F (22-28 °C) to ensure your guppies remain active and their metabolism functions properly.



Guppies sometimes experience prolapse, a condition in which a red swelling or protrusion emerges from the anus. This can be caused by constipation, which can occur if the guppy is not fed enough or frequently enough. Constipation can also be caused by the size of the food pellets, which may be too large for the guppy to digest comfortably.

In some cases, the colour of the guppy's faeces may be indicative of a prolapse. For example, if the faeces are pink, it could be a sign that the guppy is constipated and that a prolapse may occur or is occurring. However, pink faeces can also be caused by red or pink food colouring in the guppy's food.

If you suspect your guppy is experiencing prolapse, it is important to isolate the fish and seek veterinary advice. Prolapse can cause infections, so it is important to act quickly to prevent further health complications. In some cases, the prolapse may go away on its own, but it is still important to monitor the fish closely and provide any necessary treatment to prevent infections or other issues.

To treat constipation in guppies, you can feed them shelled peas or flakes/pellets without added colour. Isolating the sick fish and treating with internal bacteria medication and anti-parasitic medication may also be necessary to prevent infections and manage any underlying causes, such as parasites.

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Guppies are typically low-maintenance fish, but like any other pet, they can experience health issues. One common concern among guppy owners is pink-coloured faeces. While this can be alarming, it is often not a cause for worry and may be due to several factors, one of which is stress.

Additionally, water quality plays a significant role in the health and stress levels of guppies. Poor water quality, such as high levels of ammonia or nitrates, can lead to stress and health issues. Regular water changes and proper filtration are crucial to maintaining good water quality. The temperature and pH levels of the water should also be stable and within the optimal range for guppies. Fluctuations in water parameters can cause stress, so regular testing and maintenance are essential.

Another potential source of stress for guppies is overfeeding. Guppies are often eager eaters, and overfeeding can lead to digestive issues and stress. It is important to feed them a varied and nutritious diet in small amounts a few times a day rather than a large amount at once. Overfeeding can also lead to an excess of food debris in the tank, which can contribute to poor water quality and further stress.

Finally, guppies can experience transport shock when introduced to a new tank. This can cause stress, and pink faeces may be a symptom. To minimise transport shock, ensure you properly acclimate your guppies when introducing them to a new environment. This includes slowly matching the temperature and pH of the transport water to that of the new tank and gradually introducing them to the new water over a period of time.

In summary, while pink faeces in guppies can be alarming, it is often not a cause for immediate worry. Stress is a common issue in captive fish, and there are several steps you can take to mitigate it. By providing a suitable environment, maintaining good water quality, ensuring a proper diet, and taking care when introducing new guppies to your tank, you can help reduce stress levels and promote the overall health and well-being of your guppy.

Frequently asked questions

The most likely reason for this is that your guppy has been eating food with red dye in it. This is not something to worry about, but if you are concerned, you can switch to a different type of food.

If your guppy is constipated, you can try feeding it shelled peas to help with the constipation.

If your guppy's poop is hanging out, it could be a sign of constipation. Try feeding your guppy shelled peas to help with this issue.

If you think your guppy has a parasite, you should remove it from the tank and place it in a quarantine tank. You can also try treating the tank with medication or increasing the water temperature to help get rid of the parasite.

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