Betta Fish Internal Parasites: Causes, Symptoms & Treatments

Betta fish, which are tiny and vibrant, are well-liked as pets. They may be simple and frequently maintained in small tanks.

Nevertheless, Bettas are susceptible to parasites like other fish are. Parasitic bacteria may impact several different species in different ways.

Therefore, it’s best to learn about Betta fish internal parasites before introducing this species to your tank.

Let’s scroll down to get into details!

Betta Fish Internal Parasites: Causes, Symptoms, Treatments

This post will discuss the common causes, signs, and treatments for internal parasites in your Bettas. Let’s take a closer look!


Since there are no apparent sickness symptoms, internal parasites can be highly cunning.

Your Betta may get internal parasitic infections if you give it live foodstuffs.

That’s why experts always recommend purchasing food from a reliable supplier and adhering to recommended storage procedures.


Watching your Betta may be the best way to identify this issue before everything is too late.

Pay attention to your Betta’s everyday activities. You’ll discover that they have habits and personalities.

Keep an eye on their weight if anything changes significantly in their routines and if they start acting differently.

Your fish will often eat normally but start to appear slimmer. However, this is not always the case.

Examine your pets for parasitic infections if they start losing weight without apparent cause and don’t have much to lose.

White, stringy stools are another typical sign of internal parasitic bacteria in this species.


If you keep your fish in a tiny container, it’s better to start by performing a total water change.

If you can’t change 100 percent of tank water, performing 25 to 50 percent of water for your larger tank is acceptable.

Maracyn-Two, which may be taken internally, is the medication most frequently prescribed for Betta internal parasites.

Another often recommended way of therapy for these parasites is medicated food. It must have anti-protozoa components like Metronidazole.

If your fish dies, thoroughly clean and sterilize the tank, they were in to stop the parasitic bacteria from infecting a new species.

Never treat your pets for a condition you’re not entirely sure of the cause with medicine.

If you’re unsure whether their symptoms correspond to a particular ailment, consult with an aquatic vet.

dark blue betta

How To Get Rid Of Betta Fish Internal Parasites?

Your tank will always harbor internal parasites. Consider the following methods to get rid of them!

Maintain Water Quality

These parasitic bacteria are opportunistic, which means they flourish under favorable circumstances.

Catalysts for parasitic infections include anything that compromises your fish’s health or raises the level of stress.

Poor water conditions and the incorrect dechlorination for the Bettas you keep are examples.

You must ensure that the nitrite and ammonia levels in the tank are at 0 ppm and the nitrate levels are under 20 ppm.

Also, it’s best to clean the tank, perform a regular water change, install a sound filtration system, and condition your tank.

Regarding water chemistry, make sure to monitor trace minerals as well as metals to make sure nothing that might hurt your pets enters the tank.

Additionally, it would be best to keep phosphates, chlorine, copper, and iron at minimal levels. The water’s GH and KH should be optimal for your Bettas.

Maintain water quality

Consider Dietary Requirement

Some fleshy meals, like the beef heart or bloodworms, often have parasites that can spread to your Bettas.

If you’re not careful, the most dangerous germs and bacteria can immediately transfer to your pets.

It’s essential to remember that live foods don’t survive as long as their dry counterparts, like flakes and pellets.

Therefore, learn about your Betta’s dietary needs and only give them well-cultured living foods.

If you are unsure how to feed your pets, you can watch this video:

Quarantine New Species

When new species enter a tank after coming from contaminated water, they are renowned for spreading parasitic bacteria.

Therefore, it is wise to quarantine newcomers for two to four weeks before adding them to the main tank.

During that time, keep an eye out for any illnesses and apply treatments while giving them preventative medicine.

Treat Ailments

As mentioned earlier, stressed fish are more vulnerable to parasites than healthier ones.

As a result, if a primary illness is not treated correctly, a sick Betta with a compromised immune system will be vulnerable to secondary infection.

Even if you are sure that the illness is no longer present, it is preferable to continue treating your Bettas for an extra one or two weeks.

This way, your pets will be safer as it can prevent opportunistic illnesses from attacking them.

If you don’t take this precaution and the fish has poor immunity and gets stressed out, you can have difficulty getting rid of parasitic bacteria.

Treating ailments


How Do Betta Fish Get Parasites?

Introducing the new species to the main tank without quarantine is always the most common cause of parasites in these aquatic creatures.

How Do You Know If A Fish Has Parasites?

Check if your pet is listless, has clouded eyes, has white scars, or is struggling for oxygen.

What Temperature Kills Parasites In Fish?

It would be best if you increased the water temperature in the tank to 90°F when you find parasitic bacteria. Parasites will perish due to the heat.

Don’t worry! Most fish can withstand this temperature increase for several days.

What Removes Parasites From Fish?

You can apply specific treatments depending on the type of parasitic infections your pets get.

You can use natural therapy or medications. Be careful as the former method may harm certain species.

What Is The White Stuff In My Betta Fish Tank?

The white cotton-like substance in your aquarium is mold or bacteria developing on decaying organic waste.

Poor water parameters, overfeeding, fish waste, or wooden decorations can be the primary causes of this problem.

The Bottom Line

This article eventually showed all the essential information about Betta fish internal parasites, including symptoms, causes, and treatments.

Hopefully, you will successfully eliminate these parasitic bacteria from your tank to ensure your pets are healthy and happy.

Thanks for taking the time to read this post!