Fantail Goldfish Care: Tank Setup, Diet, Tank Mates, Diseases & More!

If you’re thinking about getting a fantail goldfish, you’re in for a treat. These beautiful fish are a joy to watch and can make great pets. But before you bring one home, it’s important to understand what it takes to care for them properly. In this article, we’ll cover everything you need to know about fantail goldfish care, from setting up their tank to feeding them the right diet.

Fantail Goldfish is a fancy variety of goldfish that requires a minimum tank size of 20 gallons. They prefer a pH range of 7.0-7.8 and moderate water flow. They are omnivorous and should be fed a varied diet of flakes, pellets, and live/frozen foods. Regular water changes and proper filtration are necessary for their well-being.

First of all, it’s important to understand that fantail goldfish require a bit more care than some other types of fish. They’re sensitive to changes in their environment, so you’ll need to make sure their tank is set up correctly and that the water is kept clean and at the right temperature. But don’t worry – with a little bit of effort, you’ll be able to create a healthy and happy home for your new pet.

One thing to keep in mind is that fantail goldfish can live for up to 10 years or more, so this is a long-term commitment. But if you’re willing to put in the time and effort, you’ll be rewarded with a beautiful and fascinating pet that will bring you joy for years to come. So let’s dive in and learn everything you need to know about caring for your fantail goldfish!

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Species Summary

If you’re considering a fantail goldfish as a pet, it’s important to know everything you can about this species. Here’s a breakdown of what you need to know:


Fantail goldfish are believed to have originated in China and were first bred for their ornamental value. They were later introduced to Japan and Europe, where they became popular as pets.


With proper care, fantail goldfish can live up to 10-15 years. However, their lifespan can be significantly shortened if they are not given the right environment and diet.


Fantail goldfish are easily recognizable by their round, plump bodies and double tails. They come in a variety of colors, including red, orange, white, and black.


Fantail goldfish can grow up to 6-8 inches in length, making them one of the larger breeds of goldfish.

Growth Rate

The growth rate of fantail goldfish can vary depending on their environment and diet. In optimal conditions, they can grow up to an inch per year.

Behavior & Temperament

Fantail goldfish are generally peaceful and get along well with other goldfish. They are also known for their playful and curious nature, making them a joy to watch.

Male vs Female

It can be difficult to tell the difference between male and female fantail goldfish, especially when they are young.

However, as they mature, males may develop small white bumps on their gill covers, while females may have a rounder body shape.

When I first got my fantail goldfish, I was amazed at how much personality he had. He would swim up to the glass to greet me every time I entered the room, and he loved to play with his toys.

I quickly learned that taking care of him was just as rewarding as watching him swim around his tank.

Tank Setup

If you’re planning on keeping fantail goldfish, you need to make sure you have the right tank setup. Here’s what you need to know:

Tank Size

The first thing you need to consider is the tank size. Fantail goldfish can grow up to 6 inches long, so you need to make sure your tank is big enough for them to swim around in.

A good rule of thumb is to have at least 20 gallons of water per fish. So, if you have two fantail goldfish, you’ll need a 40-gallon tank.


Lighting is also important for your fantail goldfish. They need a regular day and night cycle, so make sure you have a light on a timer.

You should aim for around 10-12 hours of light per day.

Filtration & Aeration

Filtration and aeration are essential for keeping your tank clean and healthy. You should aim for a filter that can handle at least twice the volume of your tank per hour.

For example, if you have a 40-gallon tank, you’ll need a filter that can handle at least 80 gallons per hour. Aeration is also important to keep the water oxygenated.


Fantail goldfish are coldwater fish, but they still need a stable temperature.

You should aim for a temperature between 65-75°F. Make sure you have a heater that can maintain this temperature.


The substrate is the material at the bottom of your tank. You can use gravel or sand, but make sure it’s not too fine or your filter may get clogged. You should also avoid sharp edges that could harm your fish.


Adding decorations to your tank can make it more visually appealing for you and your fish.

However, make sure you choose decorations that won’t harm your fish or affect the water quality. Avoid decorations with sharp edges or that can leach chemicals into the water.


Plants can provide your fish with hiding places and help improve water quality.

However, not all plants are suitable for goldfish. Make sure you choose plants that can handle the coldwater temperature and won’t be eaten by your fish.

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When setting up your tank, make sure you cycle it before adding your fish.

This means letting the tank run for a few weeks to establish a healthy ecosystem. I made the mistake of adding my fish too soon, and they got sick. Don’t make the same mistake I did!

Water Quality

When it comes to caring for your fantail goldfish, maintaining good water quality is crucial. Poor water quality can lead to stress, disease, and even death.

In this section, we’ll cover the key factors to consider in maintaining optimal water quality for your fantail goldfish.

Water Temperature

The ideal water temperature for fantail goldfish is between 65-75°F (18-24°C).

Any significant fluctuations in temperature can stress your fish, so it’s important to maintain a consistent temperature.

You can use a thermometer to monitor the water temperature and adjust your heater accordingly.

Water pH

Fantail goldfish prefer a pH range of 7.0-8.4. You can test your water’s pH using a pH test kit, which you can find at most pet stores. If the pH is too low, you can add a pH increaser.

If the pH is too high, you can add a pH decreaser. Be sure to make any adjustments gradually to avoid shocking your fish.

Water Hardness

Water hardness refers to the amount of dissolved minerals in the water. Fantail goldfish prefer slightly hard water, with a range of 150-300 ppm (parts per million).

You can test your water’s hardness using a water hardness test kit. If the water is too soft, you can add a water hardener. If the water is too hard, you can dilute it with distilled water.

Water Changes

Regular water changes are essential for maintaining good water quality. You should aim to change 20-25% of the water in your tank every week.

This will help remove any excess waste and debris, as well as replenish the water with fresh, clean water.

When performing water changes, be sure to use a water conditioner to remove any chlorine or chloramines from the tap water.

When it comes to maintaining good water quality for your fantail goldfish, it’s important to stay on top of these key factors.

By monitoring and adjusting the water temperature, pH, hardness, and performing regular water changes, you can help ensure that your fish stay healthy and happy.

Personally, I’ve found that keeping a consistent water change schedule has made a big difference in the overall health and happiness of my fantail goldfish. By making it a regular part of my routine, I can ensure that my fish always have clean, healthy water to swim in.

Tank Maintenance

Maintaining a clean and healthy tank is essential for the well-being of your fantail goldfish. Here are some tips to help you keep your tank in top condition:

First, you should perform regular water changes. This involves replacing a portion of the water in the tank with fresh, clean water.

It’s recommended that you change 20-25% of the water every week. This helps to remove waste and other harmful substances from the water, keeping it clean and healthy for your fish.

Second, you should clean the tank and its contents regularly. This includes removing any uneaten food, dead plant matter, and debris from the bottom of the tank.

You should also scrub the sides of the tank with a non-toxic aquarium cleaner to remove any algae buildup. Be sure to rinse everything thoroughly before putting it back in the tank.

Third, you should monitor the water temperature and pH levels regularly. Fantail goldfish prefer a water temperature between 65-72°F and a pH level between 7.0-7.8.

You can use a thermometer and pH testing kit to monitor these levels and make any necessary adjustments.

Finally, you should check the filter regularly to make sure it’s working properly.

A filter helps to remove waste and other harmful substances from the water, so it’s important to keep it in good working order. Follow the manufacturer’s instructions for cleaning and replacing the filter media.

Remember, a clean and healthy tank is essential for the health and happiness of your fantail goldfish. By following these tips, you can ensure that your fish thrive in their environment.

Personal anecdote: When I first started keeping fantail goldfish, I didn’t realize how important tank maintenance was. I neglected to perform regular water changes and clean the tank regularly, and as a result, my fish became sick and unhappy. Once I started following these maintenance tips, however, I noticed a significant improvement in their health and behavior. Now, I make sure to keep their tank clean and healthy at all times.

Tank Mates

If you’re considering adding fantail goldfish to your aquarium, it’s important to choose the right tank mates.

Here are some things to keep in mind when selecting compatible fish species:

Compatible Fish Species

When it comes to choosing tank mates for your fantail goldfish, you’ll want to look for fish that are peaceful and won’t nip at their fins. Some good options include:

  • Other types of goldfish, such as common or comet goldfish
  • White cloud mountain minnows
  • Zebra danios
  • Corydoras catfish

Incompatible Fish Species

On the other hand, there are some fish species that should be avoided as tank mates for fantail goldfish. These fish are known to be aggressive and could harm your goldfish:

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  • Cichlids
  • Tetras
  • Barbs
  • Guppies

How Many Fantail Goldfish Can I Have?

When it comes to stocking your aquarium, it’s important to consider the size of your tank and how many fish it can comfortably accommodate.

As a general rule of thumb, you should have no more than one inch of fish per gallon of water. This means that for a 20-gallon tank, you could comfortably have two to three fantail goldfish.

Personally, I have found that my fantail goldfish do best when they have plenty of space to swim and play. I keep them in a 30-gallon tank with a few other peaceful fish species, and they seem to be thriving.


When it comes to taking care of your fantail goldfish, one of the most important things to consider is their diet.

Feeding your fish the right foods in the right amounts can help keep them healthy and happy.

What To Feed

Goldfish are omnivores, which means they eat both plants and animals. A good diet for your fantail goldfish should include a mix of both.

You can feed them commercial fish food, which is available in flakes, pellets, or freeze-dried form.

Look for a food that is specifically formulated for goldfish, as this will provide them with the nutrients they need.

You can also feed your fish fresh or frozen foods, such as brine shrimp, bloodworms, or daphnia.

These foods can be found at most pet stores and can provide your fish with a varied and nutritious diet.


It’s important to feed your fantail goldfish the right amount of food, but not too much. Overfeeding can lead to health problems and poor water quality in your aquarium.

A good rule of thumb is to feed your fish twice a day, only giving them as much food as they can eat in a few minutes.

If there is any uneaten food after a few minutes, remove it from the tank.


Here are a few tips to keep in mind when it comes to feeding your fantail goldfish:

  • Offer a variety of foods to keep their diet interesting and nutritious.
  • Avoid feeding your fish human food or anything that is not specifically formulated for fish.
  • Monitor your fish’s weight and adjust their feeding amount as needed.
  • Consider using a feeding ring or target feeding to make sure all your fish get enough to eat.

Personally, I’ve found that my fantail goldfish are particularly fond of freeze-dried bloodworms. They go crazy for them! Just remember to feed your fish a balanced diet and they’ll reward you with their vibrant colors and playful personalities.

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Common Diseases


Fantail goldfish are prone to several diseases that can be caused by poor water quality, overfeeding, or introduction of new fish.

Some common diseases include:

  • Ich: A parasitic disease that causes white spots on the fish’s body.
  • Fin Rot: A bacterial infection that causes the fins to fray and deteriorate.
  • Dropsy: A symptom of an underlying disease that causes the fish to swell and have a pinecone-like appearance.


It’s important to keep a close eye on your fantail goldfish for any signs of illness. Some common symptoms of disease include:

  1. Loss of appetite
  2. Clamped fins
  3. Erratic swimming
  4. Discoloration or spots on the body


If you suspect your fantail goldfish is sick, it’s important to isolate them from other fish and seek treatment immediately.

Some common treatments include:

  • Medications: There are several medications available to treat different types of diseases. Consult with a veterinarian or pet store specialist for the best treatment option.
  • Water changes: Regular water changes can help improve water quality and prevent the spread of disease.


Preventing disease is key to keeping your fantail goldfish healthy. Here are some tips for preventing disease:

  • Maintain good water quality: Regularly test the water and perform water changes as needed.
  • Quarantine new fish: Always quarantine new fish for at least two weeks before introducing them to your main tank.
  • Feed in moderation: Overfeeding can lead to poor water quality and disease.

I once had a fantail goldfish that developed fin rot. I noticed the fins were fraying and deteriorating, so I immediately sought treatment and isolated the fish. With medication and regular water changes, the fish made a full recovery. It’s important to keep a close eye on your fish and seek treatment at the first sign of illness.

Signs of a Healthy Fantail Goldfish

Your fantail goldfish is a beautiful and beloved pet that you want to keep healthy and happy. Here are some signs that your fantail goldfish is in good health:

  1. Bright and Clear Eyes: If your goldfish has bright and clear eyes, it is a sign of good health. Cloudy or dull eyes can be a sign of an infection or disease.
  2. Active and Alert: A healthy goldfish will be active and alert, swimming around and exploring its environment. If your goldfish is lethargic or not moving much, it could be a sign of illness.
  3. Smooth Scales: Your goldfish’s scales should be smooth and shiny. If you notice any bumps, discoloration, or missing scales, it could be a sign of a fungal or bacterial infection.
  4. Good Appetite: A healthy goldfish will have a good appetite and eagerly eat its food. If your goldfish is not eating or seems to have lost its appetite, it could be a sign of illness.
  5. Clean and Clear Fins: Your goldfish’s fins should be clean and clear, without any signs of discoloration, fraying, or tearing. If you notice any of these signs, it could be a sign of an infection or injury.

I remember when I first got my fantail goldfish, I was so worried about keeping it healthy. But with a little bit of research and care, my goldfish has been thriving for years. By keeping an eye out for these signs of good health, you can ensure that your goldfish stays healthy and happy for years to come.

Signs Your Fantail Goldfish is Sick

If you’re a new owner of a fantail goldfish, it’s important to know the signs that your fish may be sick. While goldfish are generally hardy fish, they can still fall ill from time to time.

Here are some things to look out for:

  1. Loss of appetite or refusing to eat
  2. Swimming upside down or sideways
  3. Gasping at the surface of the water
  4. Clamped fins or fins that are frayed or torn
  5. White spots or other unusual markings on the body
  6. Red or inflamed gills
  7. Cloudy or discolored eyes

If you notice any of these symptoms, it’s important to take action quickly to help your fish recover.

One thing to keep in mind is that goldfish are social creatures and may become stressed if they’re kept alone. Make sure your fish have plenty of space and companionship to prevent stress-related illnesses.

When I first got my fantail goldfish, I had no idea what to look out for when it came to illness.

However, after doing some research and learning about the signs of sickness, I was able to catch a problem early and get my fish the help it needed.

By being observant and proactive, you can help ensure that your goldfish stays healthy and happy.


Breeding fantail goldfish can be a rewarding experience for any fish enthusiast.

However, it requires some preparation and knowledge to ensure a successful outcome.

In this section, we will cover the basics of breeding fantail goldfish to help you get started.

Breeding Setup

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Before breeding, you need to ensure that your fantail goldfish are healthy and ready to breed. It is recommended to have a separate breeding tank that is at least 20 gallons in size.

The tank should be equipped with a sponge filter, a heater, and a spawning mop. The water temperature should be around 68-74°F and the pH level should be between 7.0-7.5.

How To Breed

To start breeding, you need to introduce a male and female fantail goldfish into the breeding tank.

The male will start chasing the female around the tank, and when he is ready to spawn, he will start nudging her belly.

The female will then release her eggs, and the male will fertilize them. You can tell if the breeding was successful if you see small white eggs scattered around the spawning mop.


After spawning, it is important to remove the adult fish from the breeding tank to prevent them from eating the eggs.

The eggs will hatch in 3-5 days, and the fry will start swimming freely after 2-3 days. At this point, you can start feeding them baby brine shrimp or crushed flakes.

It is important to keep the water clean and well-aerated to ensure the fry’s survival. I remember the first time I bred my fantail goldfish.

I was so excited to see the eggs hatch and watch the fry grow. It was a lot of work, but it was worth it in the end. With the right setup and care, you too can experience the joy of breeding fantail goldfish.

Product recommendations for Fantail Goldfish:

  1. Hikari Goldfish Gold  – This is a high-quality fish food that is perfect for Fantail Goldfish. It contains all the essential nutrients that your fish need to stay healthy and vibrant.
  2. API Aquarium Water Test Kit – It is important to keep an eye on the water quality in your aquarium, and this test kit makes it easy to do so. It includes tests for ammonia, nitrite, nitrate, and pH.
  3. Seachem Prime – This is a water conditioner that helps to detoxify ammonia, nitrite, and nitrate in your aquarium. It is safe for use with Fantail Goldfish and other freshwater fish.
  4. CaribSea Eco-Complete Planted Aquarium Substrate – This substrate is perfect for creating a natural environment for your Fantail Goldfish. It contains live bacteria and is easy to maintain.
  5. AquaClear Power Filter – This filter is highly effective at removing debris and maintaining water quality in your aquarium. It is also very quiet and easy to maintain.
  6. Aqueon Aquarium Water Changer  – This device makes it easy to perform regular water changes in your aquarium. It is designed to be safe and easy to use, and can help to keep your Fantail Goldfish healthy.
  7. NICREW ClassicLED Aquarium Light – This LED light is perfect for illuminating your aquarium and showcasing your Fantail Goldfish. It is energy-efficient and easy to install.
  8. Seachem Flourish Excel – This is a liquid carbon supplement that is perfect for promoting healthy plant growth in your aquarium. It is safe for use with Fantail Goldfish and other freshwater fish.
  9. Coralife BioCube Protein Skimmer – This protein skimmer is perfect for removing organic waste from your aquarium. It is easy to install and maintain, and will keep the water in your aquarium clean and healthy.


Now that you have learned everything you need to know about fantail goldfish care, you are ready to become a responsible and caring fish owner. Remember to provide your goldfish with a suitable tank, healthy food, and a clean environment.

By following the tips and guidelines provided in this article, you can ensure that your fantail goldfish lives a happy and healthy life. Remember to monitor your fish’s behavior and health regularly, and seek professional help if you notice any signs of illness or distress.

It is important to remember that owning a pet is a big responsibility, and you should always be willing to put in the time and effort required to provide your fish with the best care possible.

Personally, I have found that owning a fantail goldfish has been a rewarding experience. Watching my fish swim around and interact with their environment brings me joy and relaxation. I hope that you too will find joy in owning a fantail goldfish and providing them with the care they deserve.


As you begin to care for your fantail goldfish, you may have some questions. Here are some common questions and answers to help you out:

What should I feed my fantail goldfish?

You should feed your fantail goldfish a balanced diet of both flakes and pellets. You can also supplement their diet with frozen or live foods like brine shrimp and bloodworms. It’s important to not overfeed your fish and to only give them as much as they can eat in a few minutes.

How often should I clean my tank?

You should clean your tank once a week. This includes changing out 10-20% of the water, cleaning the gravel, and wiping down the sides of the tank. It’s important to not clean your tank too often or too thoroughly, as this can disrupt the beneficial bacteria that live in the tank and help keep it clean.

What should I do if my fish gets sick?

If your fish gets sick, it’s important to take action quickly. You should isolate the sick fish in a separate tank and treat it with medication. You should also test the water in your main tank to make sure the water quality is good and make any necessary adjustments.

Personally, I had a scare when one of my fantail goldfish got sick. I quickly isolated him and treated him with medication, and he made a full recovery. It’s important to keep a close eye on your fish and take action if you notice any signs of illness.

Reference: Wikipedia.


Hi there! My name is Jacob, and I'm the founder of this Pet people blog that talks all about aquarium and fishkeeping. I've been passionate about fish and aquatic life since I was a kid, and I've spent countless hours learning about different species, their habitats, and how to create the perfect environment for them to thrive in.

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