Why Is My Guppies Poop White?

There are several behavioural changes that you should look out for in guppies. White poop in guppies can mean a lot of things and it can be a sign that you should consider. However, you don’t have to feel too bad about white poop from your guppies, it might be due to several reasons.

Why Is My Guppies Poop White? The most likely reason is old age. If your guppy is older than 2 years its poop is usually white. If the guppy is not old, white stringy poop is a usually a sign of parasite (or internal worm) or bacterial infection.

Guppies Poop White

It is good to notice the early signs and pay attention to the white poops before it is too late and fish loses its appetite.

Identifying White Poop Disease

The only noticeable symptoms of white poop disease are the stringy white poop. Even when the guppy is already affected with white poop disease, they can still be active and feed well. This makes it difficult to tell the major root cause of the problem.  It could be internal or external, protozoa and bacteria.

If white poop is seen in older guppies that have lived more than 2 years, it is safe to assume it is a sign of ageing. The best that can be done in this case is to provide the most favourable conditions for the affected fish.  The disease can also be caused by parasites (internal worm) or bacterial infection.

It is difficult to tell the exact types of bacteria or parasite that is responsible for white poop disease. But the best way to identify the guppy affected with white poop disease is from their poop.

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Treating White Poop Disease

This disease can be prevented by ensuring the general cleanliness of the aquarium tank. Concerning ageing guppies with white poop, it is best to improve the water parameters to best suit them.

For cases caused by parasites and bacteria, the first step is to isolate the affected fish. This is because the disease can spread from one fish and affect other members of the aquarium.  However, there is no reason to be scared or panic. Some medicines can cure most diseases of fish and perform general functions.

Even if it is one fish that is affected by white poop disease, it is advisable to treat the entire tank to avoid other fish in the tank developing the symptoms. If medicine used to treat water in the tank does not cure the disease, then the infection is internal. You should try the internal treatment.

It is important to be careful while administering drugs to the aquarium to avoid adverse effects.


It is good enough that the symptom of white poop is easily noticeable. If the white poop is not as a result of ageing, then it is as a result of internal parasite or bacteria which could be internal or external. The treatment is quite easy and there is usually no reason to panic.