Fantail Goldfish Size: Species Overview and Tank Requirements

The fantail goldfish is a small fish that can reach between six and eight inches. They have large, buoyant tails and are generally yellow or orange. Fantail goldfish live in small groups and feed on insects and other tiny prey.

Choosing the Right Fantail Goldfish Size for Aquarium

Fantail goldfish is one of the most popular aquarium fish, and for a good reason – they’re adorable and easy to care for. However, as with all fish, remember to keep an eye on their health and size. If you’re unsure whether a fantail goldfish is a suitable size for your aquarium, measure the length of its tail. 

Typically, they are between 6 and 8 inches in size, so make sure you choose one that fits within that range before buying. So, in addition to keeping your fantail goldfish healthy and size in check, make sure to perform regular water changes and add fresh food every couple of days.

Fantail Goldfish: Species Overview

A fantail goldfish is a tropical fish known for its vibrant colors and exciting tail. These fish make great pets because they’re docile, interactive, and fun to watch. They’re also easy to care for – add fresh water and some food daily, and you’re good to go. So if you’re interested in owning one of these quirky little fishes, research the best species before making a purchase. But, as with all fish, keep them healthy and tank size when selecting a fantail goldfish as a pet.


The fantail goldfish can live between five to 10 years. In addition, they are prone to contracting diseases, so make sure you take steps to keep their water quality high and monitor them closely for any indicators of illness.

Behavior & Temperament

The fantail goldfish are generally calm and peaceful fish, but they can become agitated if their environment is changed too abruptly or they feel threatened. Make sure you provide them with plenty of hiding spots and exciting objects to keep them stimulated and entertained.

Fantail Goldfish Care and Tank Requirements

A fantail goldfish tank should be around 10 to 20 gallons or smaller. They do well in a simple, tropical set up with plenty of plants and rocks for hiding. Make sure to add water conditioner and some live food as a staple diet – insects are their preferred food source, but other small creatures can also work.

Tank Size

If you’re looking for a fish that is low maintenance and easy to care for, fantail goldfish would be a great option. They require a tank size of around 10 gallons and can live with other small fish or invertebrates. They are active and playful and love to swim around the tank. Feed them flakes, pellets, or a variety of live food options to keep them occupied and healthy!

Water Parameters

If you’re thinking of adding a fantail goldfish to your aquarium, keep water parameters in mind. Fantail goldfish is one of the most popular fish in the aquarium trade because of their spectacular colors and lively nature. They prefer slightly acidic water with a pH level between 7.0 and 8.2 but can also survive in slightly alkaline water. Make sure you de-scale your filter regularly to prevent build-up that can harm your fish.

Food & Diet

Since fantail goldfish are small and require a low-calorie diet, you can feed them a variety of food items, including flakes, small pellets, and even live insects. Feed your fish regularly and provide plenty of fresh water to keep them hydrated. In addition, keep an eye on water temperature, as fantail goldfish can get very stressed out in hot environments.

Tank Equipment

In addition to water and food, you’ll need to provide your fantail goldfish with a tank of the correct size. They should be kept in tanks that measure around 10 gallons or larger. Other common additions for fantail goldfish include rocks and plants to hide behind and some live food such as insects.


These goldfish need a substrate to live on – natural or artificial aquarium water. Make sure you buy a substrate suitable for your fish and change it regularly to keep them healthy and happy. Some substrates that work well for fantail goldfish include bark, wood chips, and even plastic balls.


Adding plants to your tank can also enhance the environment for your fish and provide them with plenty of exciting hiding spots. Good plant choices for fantail goldfish include java fern, dwarf water lily, and crypts. In addition, please provide them with some floating plants to provide a place for them to swim and explore.


Fantail goldfish prefer moderate lighting, a light that provides gentle illumination but does not overwhelm their surroundings. A fluorescent tube or compact fluorescent lamp is a good option for fantail goldfish lighting. Furthermore, you can add some plants to provide shade and light for your fish at night.


If your fantail goldfish appears to be struggling with their water quality, you may need to consider adding a filtration system. A good option for a fantail goldfish filter is an algae scrubber or sponge.

Potential Diseases

Like all fish, fantail goldfish are susceptible to a few common diseases. Make sure you keep a close eye on your fish and take appropriate steps if they start showing any signs of illness. Some symptoms that may indicate disease include lethargy, poor appetite, difficulty breathing, and changes in coloration.


Goldfish are a great option if you’re looking for a small, peaceful fish community. They don’t require a lot of space and are easy to care for – they provide enough water and food. Goldfish can live in a tank with other fish, but be sure to introduce them gradually to avoid any fear or aggression. Additionally, ensure your goldfish gets along well with other non-aggressive fish in its tank. If all goes well, you’ll have happy tankmates for years to come.