Fantail goldfish are a type of fancy goldfish known for their elegant, flowing fins. They make a striking addition to any tank, and they're hardy and easy to care for, making them perfect for even a beginner fish keeper. They're peaceful, as well—you can pair them with other easygoing fish, as long as they can tolerate the Fantail's cooler waters. Ready to get started? From feeding to setting up the perfect tank, we're here to answer your questions about taking care of these gorgeous fish!

Question 2 of 12:

How do you prepare a tank for a goldfish?

  1. In general, goldfish create a lot of waste, so a filter is an absolute necessity for your fish tank. Otherwise, ammonia and nitrates will build up in the water, creating an unhealthy environment for your Fantail. If you're planning to include aquarium plants—or if you just want to illuminate your tank—add a lighting rig, as well. [2]
    • You don't have to include a pump or an air stone in your tank, but they do help provide more oxygen for your fish, so feel free to add one if you'd like. [3]
    • Be sure to place your tank somewhere that's out of direct sunlight, protected from kids and other pets, and away from the vibrations of appliances or loud speakers. [4]
  2. Fantails are delicate and they like to dig, so choose a soft substance like sand as your substrate. Rough grains or sharp gravel could easily scratch them, and those injuries could make your fish more susceptible to disease. [5]
    • Some people do use smooth gravel as a substrate for their Fantails, but in general, sand is the safest option.
  3. Fantails love to explore their environment, and they also need a place to hide if they get a little nervous. Live plants like Hornwort make the best decoration for their tank—you can either plant them in the substrate or let them float on top of the water, as long as you don't cover either the top or bottom of the tank completely. [6]
    • You can also add fake plants, smooth rocks, driftwood, or plastic decorations. However, only include items that are intended to be used in an aquarium. Otherwise, they could contain chemicals or bacteria that could make your fish sick. [7]
    • Don't use anything with sharp edges that could injure your fish.
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Question 3 of 12:

Can a goldfish live in tap water?

  1. Tap water is treated with chlorine to kill bacteria—and while it's safe for people, it's pretty dangerous to fish. Luckily, it's easy to treat. Just pick up some de-chlorinator at your local aquarium supply store or pet shop, then follow the directions on the label for how to use it. [8]
    • Typically, you just measure out the recommended amount of de-chlorinator and let it sit for 2-5 minutes before adding the water to the tank.
    • If you prefer not to use chemicals, let the water sit in an open container for 24-48 hours before you add it to the tank. If you're in a hurry, you can boil the water for 20-25 minutes first, but be sure to let the water cool all the way down to room temperature before you transfer it to the tank. [9]
Question 4 of 12:

Do Fantail goldfish need a heater?

  1. Goldfish are a cold-water fish—they thrive when the water is between 65–72 °F (18–22 °C). Conveniently, this is about room temperature in most homes. However, if you live somewhere where the temperature can suddenly drop dramatically, it might be a good idea to get an aquarium heater so you can keep the temperature steady year-round. [10]
    • Use a thermometer to monitor the temperature in your tank.
    • It's okay if your tank gets a little higher or lower than this, as long as it doesn't change by more than about 1–3 °F (1–2 °C) in a single day. Your fish may be able to tolerate temperatures as low as 40 °F (4 °C) as long as the shift is gradual. [11] However, avoid letting the water get 80 °F (27 °C).
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Question 6 of 12:

How often should I clean my fish tank?

  1. If you overfeed your fish, the uneaten food will dissolve in the tank. Not only can that release toxins into the tank, but it could also promote the growth of bacteria that could make your Fantail sick. To avoid that, use a net to scoop out any extra food at least once a day—although it's better to do it after every feeding. [13]
  2. Fantails might look elegant, but they have a tendency to be pretty messy. To keep the tank clean and your fish at their finest, take out about 20-25% of the water each week and replace it with clean water. Just remember to use de-chlorinating drops if you get the water from the tap. [14]
    • If you see any green algae growing on the sides of your tank, wipe it away with a clean cloth while you're changing the water.
    • Before you add the replacement water, let it sit at room temperature for about 15 minutes so it will be the same temperature as the water in the tank. [15]
    • Don't change all the water at once unless your vet tells you to—it will be really stressful for your Fantail.
  3. Use an aquarium test kit to keep an eye on the pH level of your aquarium—it should always stay between 6.0 and 8.0, although the closer to 7.0 (neutral), the better. Try testing the water about once a week to make sure it stays in that range. If it gets too high or low, it could make your fish sick. [16]
    • If the pH gets too low (acidic), change the water more often. If it gets too high (alkaline), add peat moss to your filter or place driftwood in the tank. [17]
    • Also, check the levels of ammonia and nitrate with a water testing kit—these should be undetectable. If they get too high, change the water more often.
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Question 7 of 12:

What do you feed Fantails?

  1. As long as you choose a high-quality goldfish food, flakes and granules will both provide the nutrition your Fantail needs to stay healthy. However, granules float on the top of the water and dissolve more slowly than flakes, so it's easier to remove any uneaten food. That, in turn, helps keep your tank cleaner. [18]
    • Choose pellets that are 25%-50% the width of your fish's mouth. If you can't find pellets that are small enough for your fish, it's fine to feed them flakes. [19]
  2. A few times a week, supplement your Fantail's diet with a treat like frozen or freeze-dried brine shrimp, daphnia, or blood worms. Goldfish also like to nibble on plants, so try offering them tiny bits of veggies like lettuce, blanched peas, duck weed, or zucchini. [20]
    • If you're offering them a freeze-dried food, soak it in a little water for 10-15 minutes to soften it before you give it to your fish.
    • Give your fish these snacks in place of one of their normal meals. These treats provide good nutrition, so you can offer them as often as you like. [21]
    • Some pet shops offer live food for goldfish. However, live foods might have parasites or bacteria that could make your Fantails sick, so it's safer to stick to the frozen or freeze-dried versions. [22]
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Question 8 of 12:

How many times a day should I feed my Fantail goldfish?

Question 11 of 12:

What other fish can live with Fantail goldfish?

Question 12 of 12:

How do I know if my Fantail is sick or unhealthy?

  1. Because of their compact organs, Fantails are especially susceptible to swim bladder disease. If your fish has this, you'll notice them floating on top of the water, laying on the bottom of the tank, or swimming upside-down. Usually, the cause of this is constipation, so if you think swim bladder disease might be to blame, stop feeding your fish for about 24 hours. [28]
    • When you feed your fish again, give them a high-fiber snack like lettuce or zucchini. [29]
  2. These can indicate a bacterial or fungal issue in their tank. If you notice anything like that, immediately clean the tank, and move the sick fish to a quarantine tank until it's healthy again. You can usually treat problems like this with over-the-counter antibiotics or antifungals, but it's best to consult a fish veterinarian to be sure. [30]
    • Also, consult your vet if you see any ulcers, unusual growths, or if your fish is gasping at the surface of the water or rubbing against objects in the tank. [31]
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Community Q&A

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  • Question
    Why is my fish sinking to the bottom of the tank?
    Community Answer
    If your fish goes to the bottom of the tank only for a few seconds, it may be scavenging for food. If your fish does this for longer periods of time, it may have a swim bladder disorder. Visit your local fish tank store and pet store, and see if you can find medication for it. Some fish tank stores may also offer to treat your fish for you.
  • Question
    What is the life span of a Fantail Goldfish?
    Community Answer
    It really depends. Some goldfish live only a few years, while others can live up to 10 years.
  • Question
    How can you tell if your fish is pregnant?
    Community Answer
    The female will look plumper, and the male often will try to chase the female, or he will push his head against the female's head.
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      1. https://www.aquariumsource.com/fantail-goldfish/
      2. https://animal-world.com/encyclo/fresh/goldfish/FantailGoldfish.php
      3. https://www.pdsa.org.uk/taking-care-of-your-pet/looking-after-your-pet/birds-fish-and-other-pets/caring-for-your-goldfish
      4. https://www.fishkeepingworld.com/fantail-goldfish/
      5. https://www.aquariumsource.com/fantail-goldfish/
      6. https://www.pdsa.org.uk/taking-care-of-your-pet/looking-after-your-pet/birds-fish-and-other-pets/caring-for-your-goldfish
      7. https://www.fishkeepingworld.com/fantail-goldfish/
      8. https://www.ratemyfishtank.com/blog/properly-maintaining-the-ph-in-a-freshwater-aquarium
      9. https://kb.rspca.org.au/knowledge-base/what-should-i-feed-my-pet-goldfish/
      10. https://thefishsite.com/articles/how-big-are-your-fish-pellets
      11. https://www.fishkeepingworld.com/fantail-goldfish/
      12. https://kb.rspca.org.au/knowledge-base/what-should-i-feed-my-pet-goldfish/
      13. https://animal-world.com/encyclo/fresh/goldfish/FantailGoldfish.php
      14. https://www.fishkeepingworld.com/fantail-goldfish/
      15. https://animal-world.com/encyclo/fresh/goldfish/FantailGoldfish.php
      16. https://www.fishkeepingworld.com/fantail-goldfish/
      17. https://www.aquariumsource.com/fantail-goldfish/
      18. https://www.fishkeepingworld.com/fantail-goldfish/
      19. https://www.aquariumsource.com/fantail-goldfish/
      20. https://www.fishkeepingworld.com/fantail-goldfish/
      21. https://www.fishkeepingworld.com/fantail-goldfish/
      22. https://www.pdsa.org.uk/taking-care-of-your-pet/looking-after-your-pet/birds-fish-and-other-pets/caring-for-your-goldfish

      About this article

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      Fantail goldfish are a great pet if you're new to owning fish since they're so easy to care for. To keep your fantail goldfish happy and healthy, place it in a tank that holds at least 10-20 gallons of water per fish in it. The tank should also have a heater and a filter. Feed your goldfish a high-quality fish food once a day, making sure to follow the directions on the packaging so you don't overfeed it. You should also place some tender aquarium plants in your fish tank, which will supplement its regular food. Clean the tank whenever it gets dirty, or at least once a week. Make sure to scrape any algae away from the bottom of the tank and replace 10-15 percent of the water. To learn how to deal with territorial goldfish, read more from our Veterinary co-author!

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