Fantail Goldfish 101: Care, Size, Lifespan & Tank Mates DONE

By: Asher Stone
Updated: February 26, 2026

If you're looking to add some color and personality to your tank, Fantail Goldfish might be the perfect choice for you! They're a beginner-friendly species but still require specific care to keep them healthy and happy.

In this guide, we'll provide you with all the details you need to know about their care, size, lifespan, and tank mates.

Fantail Goldfish: Species Summary

These popular fish are adored for their egg-shaped body and double-tail fins and are a favorite among pet owners.

Fantail Goldfish Species Summary

To learn more about the care, size, lifespan, and tank mates of Fantail Goldfish, refer to the table below.

Scientific Name:Carassius auratus
Common Names:Fantail Goldfish, veil tail
Max Size:6-8 inches
Aquarium Compatibility:10-gallon min.
Water pH level:6.0 to 8.0
Water hardness:4 to 20 dKH
Appearance:Deep and thick
Water temperature range:65° - 80°F.
Breeding:Prolific breeders
Ease of Care:Very easy
Lifespan:5-10 years
Origin:Asia

Fantail Goldfish Appearance and Characteristics

You can expect your fantail goldfish to have an egg-shaped body with double tail fins, a double anal fin, and a singular dorsal fin, and they come in various colors.

Fantail Goldfish Appearance

Fantails may also possess:

  • Metallic or nacreous scales
  • Telescoping eyes after six months
  • Expansive fins for their size
  • A peaceful and mellow temperament
  • Social behaviors with tank mates.

Fantail Goldfish Origin and Distribution

Fantail goldfish aren't found in the wild and have been created through selective breeding techniques. This species is popular in the pet trade and available at most pet stores. They're a result of careful selection and come in various colors, with metallic or nacreous scales. They have an egg-shaped body, a double anal fin, and a single dorsal fin.

Their double tail fins split into four lobes, and their eyes may even telescope after six months of age. This species is the perfect addition to any home, providing a sense of belonging and companionship.

Also Read: Why Is My Goldfish Turning Black? Causes With Treatment

Fantail Goldfish Lifespan

The average lifespan of a Fantail is five to ten years with proper care. Providing them with top-notch care can help them reach the upper end of the range. Regular monitoring and prevention of diseases are important for their well-being, and water parameters should be kept within specific ranges.

Diet is also important; stick to high-quality, easily digestible foods and include high-fiber plant-based foods. With the right care, Fantails can live for several years, bringing joy to their owners.

Don't forget to keep the tank size and temperature suitable and create a stress-free environment with compatible tank mates. You can create an enjoyable living space for your Fantail that will ensure they live a long and healthy life.

Fantail Goldfish Behavior and Temperament

Fantail goldfish are peaceful and mellow, swimming around the tank, interacting with others, and exploring. They're social without needing to shoal, so aggression isn't an issue. Plus, they're easy to care for, and you can enjoy their company for up to 10 years.

Fantail Goldfish Behavior and Temperament

When choosing tank mates, make sure they're compatible and calm so the Fantails don't get stressed. Aggressive or fin-nipping species should be avoided, as they can damage the Fantail's fins.

Breeding them is also possible and should be done in a separate tank with similar conditions. Finally, make sure to remove the parents after spawning, or they may eat the eggs.

Fantail Goldfish Care Guide

Proper care is essential for a healthy and happy Fantail goldfish.

Fantail Goldfish Care Guide

Food and Diet

Feeding your fantail goldfish is essential for its health and longevity. To give your fish the nutrition it needs, provide a variety of food types that include:

  • Live or frozen foods
  • High-quality, easily digestible foods
  • High-fiber plant-based foods
  • Sinking pellets
  • Flake food.

Diet and Nutrition in Captivity

You need to provide your fantail goldfish with a balanced diet that includes both protein and fiber. Stick to high-quality, easily digestible foods like brine shrimp, bloodworms and plant-based options like lettuce and peas.

Variety is important, as it will help ensure your pet is getting the essential nutrients. Feeding once or twice a day in small portions will help prevent digestive issues.

Feeding Frequency

Regularly monitoring the amount of food you give your pet is important for their health. Fantail goldfish should be fed two to three times per day with a pinch of food for each meal. Overfeeding can lead to digestive problems, so make sure not to overdo it.

It's best to feed your goldfish in the morning and evening and avoid late-night feedings. You can provide occasional treats like live or frozen food but don't forget to remove any uneaten food after a few minutes.

Providing your pet with a varied diet and adhering to a proper feeding schedule is essential for them to stay healthy.

Feeding Methods

To ensure their health, make sure you feed your pet the right amount of food in the right way. Fantail goldfish benefit from regular meals that are tailored to their size and age. Avoid overfeeding, as this can lead to health complications. You should feed them twice a day, but opt for smaller meals if they're young.

Offer a mix of high-quality, easily digestible foods, such as live or frozen brine shrimp and bloodworms. Include some high-fiber plant-based foods, like lettuce and peas. Be sure to keep a close eye on feeding times and amounts, and never feed your fish more than they can consume in a few minutes.

Also Read: A Complete Detailed Goldfish Feeding Guide

Tank Size

You'll need a tank of at least 10-20 gallons per Fantail goldfish. When choosing a tank for your Fantails, remember that bigger is always better. A larger tank will provide more room for your fish to swim and explore, reducing stress and improving their overall health.

It's also important to make sure the tank has a soft sand substrate and simple decorations. Make sure you provide the right environment for your fish and don't overcrowd the tank!

A filter and heater are also necessary, as Fantails prefer cooler temperatures. With the right care and maintenance, your fish will live a long and happy life.

Water Quality

To ensure their well-being, you need to maintain the water quality of their tank within specific parameters. These parameters include a pH level between 6.5 and 8.0, a hardness of 10 to 20 dGH, and a temperature of 65 to 75 degrees Fahrenheit.

Having a filter and a heater in the tank can help keep the water conditions stable. It's also important to change 25%-50% of the water every week to prevent toxins from building up. Regular water tests should be conducted to make sure the water parameters are within the safe range.

Furthermore, adding aquarium salt to the tank can reduce stress and prevent disease. Finally, keep an eye out for any signs of distress or disease and address them immediately.

Water Changes

Regularly changing 25%-50% of your aquarium's water is essential for maintaining the health of your fish. Doing so will help to keep the water parameters stable and free of toxins, ensuring that your fish have a safe and healthy environment to live in.

This should be done at least once a week, and it's important to use a water conditioner to remove chlorine and other impurities from the water before you add it to the tank. Make sure to match the temperature and pH levels of the new water to those of the aquarium before adding it.

Doing water changes also helps to remove excess food and waste, reducing the risk of disease and maintaining water clarity. To make the process easier, use a gravel vacuum to remove debris from the substrate.

Water Conditioner

Using a water conditioner is an important part of keeping your fish healthy. It removes chlorine and other impurities from the water for a safe environment. A good water conditioner:

  • Creates a safe haven for your fish by removing toxic materials
  • It helps maintain a healthy pH balance.
  • Offers essential minerals and trace elements
  • Neutralizes harmful chemicals
  • Detoxifies ammonia and nitrite levels.

By creating a safe environment with a water conditioner, you're offering your fish a place to thrive and grow. It's a simple yet powerful way to show your fish that you care.

Cleaning the Tank

Keeping your tank sparkling clean is essential for your fish's health and wellbeing. Cleaning the tank should be done on a regular basis to maintain water quality and keep your fish healthy.

It's important to use the right tools for the job, like a siphon or a gravel vacuum. The siphon vacuum is used to remove debris and uneaten food from the substrate. It should be used with caution to avoid disturbing the delicate balance of the tank.

A gravel vacuum is necessary to remove excess waste and debris from the substrate. It should be used with care to avoid disturbing the beneficial bacteria living on the substrate.

Gravel Vacuuming

Cleaning out your tank's gravel with a vacuum is an important part of maintaining your fish's health. Vacuuming the gravel helps remove organic debris and uneaten food, keeping the water clean and free from build-up. The vacuum should be used every two weeks, and it's best to do it when performing a water change.

Make sure to use the lowest vacuum setting so as not to disturb the gravel too much. When vacuuming, start by sucking up the debris in the corners and then move in a sweeping motion to the center of the tank. Aim the vacuum away from the plants and decorations so they aren't disturbed.

Algae Scraper

To maintain a clean and healthy tank, you should regularly scrape away any algae buildup. An algae scraper is an essential tool for this, helping to remove any unwanted growth and preventing it from spreading.

To use it, you should submerge the scraper in the tank and move it along the walls and surfaces. You can also use it on decorations, rocks, and other items. Be sure to rinse the scraper off after each use and to replace it regularly to avoid spreading any bacteria.

If you don't have an algae scraper, you can use a nylon brush or even a cloth. Just be sure to rinse any materials thoroughly afterward.

Sponge

Having a sponge in your tank is a great way to help keep it clean and healthy. It's a great way to supplement your tank's filtration system and remove excess debris from the water. A sponge is a natural, affordable, and easy-to-maintain solution for any tank.

Sponges come in a variety of textures and shapes and can be found in most pet stores. When buying, make sure to purchase one that's suitable for your tank's size and inhabitants. Sponges are also great for removing algae and other unwanted particles from the tank. They can even help to keep the water oxygenated.

Place the sponge in an area with good circulation and make sure to regularly clean it to prevent it from clogging. Sponges are a great addition to any aquarium and can help keep your tank clean and healthy.

Transportation and Handling

When transporting and handling your Fantail Goldfish, always use caution to prevent injury and stress. Use two hands and a supportive, wet surface when transferring the fish from its tank to a container. Make sure the container is clean, and the water temperature is the same as the tank water.

When introducing the fish to the container, do it slowly and steadily. Please don't move the fish too quickly or startle it. When transporting the fish to a new location, use a secure container and make sure the water temperature is consistent. Provide adequate aeration, and don't keep the container in direct sunlight.

Also Read: PearlScale Goldfish Care Guide 101: Size, Diet & All

Lighting and Heating

You'll need to provide your Fantail Goldfish with appropriate lighting and heating to keep them healthy and comfortable.

A good quality aquarium light should have a full-spectrum output to promote natural behaviors. The tank should have a light cycle of 10 to 12 hours a day. You can also add a low-level night light to allow them to rest properly.

As for heating, choose a reliable heater that's sized for the tank and keep the temperature constant. The ideal temperature range for Fantail goldfish is between 65°and 72°F. Monitor the tank's temperature and adjust the heater accordingly.

Filtration

To ensure your fish's health, filtration is necessary to keep the water clean and stable. A good filtration system removes waste, harmful chemicals, and uneaten food while also providing oxygen and circulation.

It's important to select a filter that's the right size for your tank and the number of fish you have. A canister filter is the most effective option, as it's hidden from view and keeps the water clean and clear. An air-powered filter or power filter is another option and is easier to maintain but may not be as effective.

Aquarium Decor and Plants

Adding aquarium decor and plants to your tank helps create a natural environment for your fish to explore and hide in. The tank should have a soft sand substrate with simple decorations like rocks, driftwood, and artificial plants.

The plants should be soft and delicate so they don't damage the fins of your fantail goldfish. Live plants provide extra oxygen to the water and can help create a more natural environment in the tank. You can also include fine-leaf plants for the eggs if you plan on breeding your fish.

Also Read: Ryukin Goldfish Care, Lifespan, Behaviour, Diet & All

Substrate and Gravel

Substrate and gravel should be soft and gentle to avoid damaging the delicate fins of your fish. Sand is a great choice, as it won't damage the fins or cause harm to the fish. A mixture of fine gravel and sand is also an option, as it will allow for some plants to be rooted in the substrate.

The substrate should be at least two inches deep to provide enough space for the fish to swim and explore. You should also try to match the colors of the substrate and gravel to the color of your fish. This will create an aesthetically pleasing look for your tank. Avoid using sharp-edged gravel, as this can cause harm to the fish's fins and scales.

Ammonia and Nitrate level

Monitoring and maintaining ammonia and nitrate levels is important for keeping Fantail goldfish healthy. You need to make sure that the tank isn't overloaded with fish and that water changes are done regularly.

Ammonia levels should be kept as low as possible, ideally at 0 ppm (parts per million). Nitrate levels should be kept at around 20 ppm or less. If the levels are higher than this, you should do a large water change to reduce them.

Regular water testing is essential to make sure the levels are stable and aren't fluctuating. If you're unsure of how to do this, there are helpful resources available online.

Tank Mates & Breeding

When considering tank mates for Fantail goldfish, choose peaceful companions who won't damage or nip their fins. Some of them are:

Breeding

Fantail goldfish are prolific breeders, and you'll need to provide a separate breeding tank with similar conditions for them. It should be equipped with fine-leaf plants or spawning mops, and breeding should start at a lower temperature and then gradually raise. The parents should be removed after spawning to prevent them from eating the eggs.

Fantail Goldfish Breeding And Propagation

To ensure a successful breeding experience:

  • Monitor water parameters and perform regular water changes
  • Ensure temperatures are within the ideal range
  • Feed a nutritious and varied diet
  • Provide plenty of hiding places for the eggs
  • Make sure the tank is well-filtered and oxygenated.

How Many Fantail Goldfish Can Be Kept in One Tank

It's recommended to keep no more than two Fantail goldfish in one tank. This is due to their size and habit of producing a large amount of waste, which can be difficult to keep up with in a single tank.

A 10 to 20-gallon tank is ideal for two Fantail goldfish to maintain a healthy environment. A larger tank may be needed if you plan to add more fish.

It's important to keep in mind that the more fish there are, the higher the chance of ammonia and nitrate levels increasing, leading to water quality issues.

Also Read: Goldfish Tank Mates List ( ): Friends & Enemies

Fantail Goldfish Potential Fish Diseases & Medication

  • Cloudy Eye: If a goldfish's eye is cloudy, it has a sick body, and you should separate it from the other so they don't get too ill. You can treat goldfish with clouded eyes by putting them in a quarantine tank with clean water about 5 degrees cooler than their tank at home.
  • Fin Rot: If a fish's fins start to look like they're deteriorating and becoming discolored, it has fin rot, and you should immediately treat it with an aquarium salt medication.
  • Anchor Worms And Fish Lice: If a goldfish has red or white worms sticking out of its body, it has anchor worms, and you should immediately treat it with an aquarium salt treatment. If you don't, the fish will die from a lack of oxygen because the worms attach themselves to their gills.
  • Ich: Ich is a disease that makes a fish's body look like it has white powder growing on it. It's best to raise the temperature in your tank to 86 degrees and add aquarium salt so the ich can die off.
  • Constipation: Constipation occurs when food gets stuck inside a goldfish and blocks its digestive system.
  • Dropsy: Dropsy causes a goldfish's scales to look like they're sticking out of its body, and you can recognize it by looking at your fish's eyes.
  • Cotton Wool Disease: The cotton wool disease occurs when a goldfish's skin starts getting thicker and forming fibers. Treating cotton wool disease is best by raising the water temperature and adding aquarium salt.
  • Tail/Fin Rot: Tail/fin rot is caused when a fish's tail or fins stop growing back after they get smaller, so you should quickly treat it with an aquarium salt treatment before it spreads to other parts of its body.
  • Mouth Rot: Mouth rot occurs when a fish's mouth gets darker, and its teeth will soon fall out. To treat mouth rot, feed your fish quality fish food with vitamins in it instead of living foods like bloodworms because it might have an infection if you do that.

Also, give your fish marigold petals and rainforest leaves to make its body healthier.

Swim bladder disease is when a goldfish can't control how buoyant it is in the water because something is wrong with its swim bladder. To treat these issues, feed your fish quality food w

Advantages of Having Fantail Goldfish in Your Tank

Having a Fantail goldfish in your tank is a great way to add beauty and activity to your aquarium while also providing hours of entertainment. With their interesting shapes and vibrant colors, they're sure to be a hit.

These fish are also peaceful creatures and can live harmoniously with other tank mates. They can also provide a great learning experience, as they're relatively easy to care for. With a proper diet and clean water, your Fantail goldfish should thrive and give you many years of enjoyment.

Disadvantages of Having Fantail Goldfish in Your Tank

As with any pet, there are some disadvantages to owning a Fantail which you should consider. Fantails are sensitive to water parameters, so maintaining the proper environment is essential. If water parameters become too high or low, this can lead to stress and illness in your fish.

It can be difficult to provide the right diet for your Fantail, and they can be prone to digestive issues such as swim bladder disorder. Additionally, Fantails have a shorter lifespan than other species, so you should be prepared for the potential of premature death.

Lastly, Fantail goldfish can be prone to bullying from other tankmates, so it's important to choose tankmates carefully. With proper care, however, a Fantail can be a beautiful and loving addition to your home.

Conclusion

Fantail Goldfish are very hardy fish, which makes them too hard to take care of. They usually don't live long enough to make it worth your while.

If you want to get yourself a pet that's less likely to cause problems and more likely to be able to reproduce quickly, you should probably try getting another type of goldfish instead.

Disclaimer

AquaMarinePower.com does not intend to provide veterinary advice. We go to great lengths to help users better understand their aquatic friends. However, the content on this blog is not a substitute for veterinary guidance. For more information, please read our disclaimer.

Amazon Associates Program

AquaMarinePower.com is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to Amazon.com.

Copyright © 2023 AMP
cross