Ryukin Goldfish Care Guide (Tank, Water, Feed)

Ryukin goldfish (Carassius auratus) is a favorite among goldfish enthusiasts. They have a distinct appearance and are quite easy to take care of.

Ryukin Goldfish

Read on to find out how to properly care for Ryukin goldfish.

How Long Do Ryukin Goldfish Live?

The lifespan of a Ryukin goldfish is 10 to 15 years.

However, this can vary depending on the care they receive and the conditions of their environment.

With proper care, your Ryukin goldfish can enjoy a long and healthy life.

What Are the Tank Requirements?

Let’s first have a look at the optimum tank requirements you need to for the Ryukin Goldfish.

Ideal Tank Size

A minimum 10-gallon aquarium is required to house a single Ryukin goldfish. However, it is recommended to have a 20-gallon to 30-gallon fish tank.

If you plan on keeping more than one, you will need an additional 10 gallons for every Ryukin Goldfish you plan to keep.


Ryukin goldfish are not picky when it comes to substrates. You can use gravel, sand, or a bare bottom in their tank.

However, it is important to avoid using sharp objects that can damage their delicate fins.

Ryukin goldfish like digging around; hence fish tank owners often prefer gravel as the substrate.

Sand, on the other hand, can be easily disturbed, which will release contaminants into the water.

Type of Décor

Ryukin goldfish are not known to be destructive, so you can use a variety of decorations in their tank.

Some good options include live or artificial plants, rocks, and driftwood.

Just make sure that any decorations you use are safe for goldfish and do not contain any sharp edges that can damage their fins.


Ryukin goldfish are not known to be plant-friendly.

They have a habit of uprooting and eating live plants. If you do decide to use plants in their tank, go for artificial plants that won’t hurt Ryukin goldfish.

What to Feed Ryukin Goldfish

Ryukin goldfish are omnivores and will eat a variety of both meaty and plant-based foods. Fish owners should ideally feed them twice a day at the same time.

Some good options for their diet include:

Pellets and Flakes

Ryukin Goldfish like eating pellets and flakes. They are a common food source for them and are widely available in pet stores.

However, they alone won’t provide enough requirements for Ryukin goldfish.

Live Food

Live food is a delicious treat for Ryukin goldfish. Not only do Ryukin goldfish love having them, but they are also quite nutritious as they have lots of protein.

Some common examples of live food are Brine shrimps, Daphnia, bloodworms, and earthworms. They can also be frozen for a long time.

However, you will need to thaw them before feeding them to Ryukin goldfish.

Vegetables, Plants, and Fruits

These are another good source of providing the required nutrients to Ryukin goldfish. However, fish owners need to ensure they are cut up into tiny pieces.

Ryukin goldfish also like nibbling on live plants.

However, you shouldn’t put too many live plants in your aquarium as they can suck up more oxygen which will cause problems for your tank occupants.

It is important to feed your Ryukin goldfish a variety of foods to ensure they are getting all the nutrients they need.

You should also avoid overfeeding them as this can lead to health problems such as obesity.

How Should the Water Be for Ryukin Goldfish?

Ryukin goldfish aren’t tropical fish, and hence, they need a somewhat cooler temperature than most other fish.

It is recommended to buy a tank thermometer if you have Ryukin goldfish.

Ryukin goldfish require a water temperature of 68 degrees Fahrenheit to 74 degrees Fahrenheit.

The pH level should be anywhere from 6.0 to 8.0, and the hardness should be 5 to 19 dGH.

The water in your Ryukin goldfish tank should be kept clean and free of harmful chemicals. You can perform regular water changes and use a filter and/or aeration system.

It is recommended to perform a 20% water change once every two weeks.

During a water change, you should remove all the decorations from the tank and vacuum the substrate to remove any built-up debris.

After you have finished cleaning the tank, you can then add fresh water that has been treated with a de-chlorinator.

Do Ryukin Goldfish Require a Filtration System?

It is not necessary to have a filtration system in your Ryukin goldfish tank.

But it is still a good idea to use one as it will help oxygenate the water and keep it clean and free of harmful chemicals.

Ryukin goldfish are generally slow swimmers. Fish owners should be careful not to install a filtration system that is too powerful.

Ryukin goldfish won’t be able to bear that much water movement.

Ryukin Goldfish Diseases

Ryukin goldfish have a rather delicate immune system, and as such, they are prone to many diseases. Some of the most common include:


Ich, or white spot disease, is a common ailment in goldfish. It is caused by a parasite that affects the fish’s skin and fins.

The parasite is visible as white spots on the fish’s body. Ich can be fatal to goldfish if left untreated.

Ich can be treated with a variety of methods. One common treatment is to raise the temperature of the water.

This will speed up the parasite’s life cycle, allowing the fish to recover more quickly.

Other treatments include adding salt to the water or using a commercial ich treatment product.

Also read: How to Treat Ich in Betta Fish?

Fin Rot

Fin rot is a common disease in goldfish that is caused by bacteria. The early symptoms of fin rot include fraying or blackening of the fins and tail.

If left untreated, the disease can progress and lead to tissue death and ulceration.

Fin rot is often fatal in goldfish. However, with prompt treatment and good husbandry, many goldfish can recover from this disease.

There are several different types of bacteria that can cause fin rot, but the most common culprit is Pseudomonas aeruginosa.

This bacterium is found in water sources all over the world, which is why fin rot is such a common disease in goldfish.

Fin rot is often spread through contact with infected fish or contaminated water. It can also be spread through poor water quality or overcrowding.

The best way to prevent fin rot is to maintain good water quality and quarantine new fish before adding them to your tank.

If you suspect that your Ryukin goldfish has fin rot, the first thing you should do is improve the water quality in your tank.

Make sure to do a large water change and vacuum the gravel to remove any decaying matter that could be harboring bacteria.

You should also increase the aeration in your tank and raise the temperature to 82°F (28°C). The warmer temperature will help to boost your goldfish’s immune system.

You need to treat your goldfish with a broad-spectrum antibiotic. There are many different antibiotics that can be used to treat fin rot, but the most common is Kanamycin.

Kanamycin is available in both liquid and tablet form and can be found at most pet stores.

It is important to follow the directions on the package carefully when using any medication on your fish.

After you have treated your goldfish with an antibiotic, you should see a noticeable improvement within a few days.

However, it is important to continue treating for at least two weeks to make sure all of the bacteria has been killed.

If you stop treatment too early, the bacteria could come back, and your goldfish could get sick again.

Swim Bladder Disease

Swim bladder disease is a common problem in goldfish and can be caused by a number of different things.

The swim bladder is a sac located just behind the goldfish’s intestines, and it is filled with gas.

This gas allows the fish to control its buoyancy and helps it to swim upright.

If the swim bladder becomes diseased, it can lose its ability to function properly, and the fish will have difficulty swimming.

There are several different types of swim bladder disease, but the most common one is a bacterial infection.

This type of infection is usually caused by dirty water or eating contaminated food.

It can also be caused by stress, which weakens the fish’s immune system and makes it more susceptible to infection.

Symptoms of swim bladder disease include lethargy, loss of appetite, and difficulty swimming. The fish may float upside down or have trouble staying afloat.

In severe cases, the fish may become bloated and die.

If you suspect that your goldfish has swim bladder disease, the best course of action is to take it to a veterinarian for diagnosis and treatment.

There are a number of different medications that can be used to treat the disease, but it is important to catch it early so that it can be treated before the fish suffers any permanent damage.

Also read: Why Is Goldfish Sitting at the Bottom of the Tank?

How to Prevent Ryukin Goldfish from Getting Sick

There are a few things you can do to help prevent your Ryukin goldfish from getting sick.

Some of the most important prevention methods are:

  • Quarantine new fish before adding them to the main tank.
  • Perform regular water changes and clean the tank regularly.
  • Feed your fish a balanced diet and avoid overfeeding them.
  • Take your fish to the vet for regular check-ups.

By taking these measures, you can help keep your Ryukin goldfish healthy and happy for many years to come.

What is the Typical Behavior of Ryukin Goldfish?

Ryukin goldfish are peaceful fish that do well in community tanks. They are not known to be aggressive and will generally get along with other types of goldfish.

They are active fish that enjoy swimming around. They also like to hide and rest in caves and other hiding spots.

It is recommended to put such décor that provides them with such places.

What Type of Company Should Ryukin Goldfish Have?

Some good tank mates for Ryukin goldfish include:

  • Other types of goldfish such as Commons, Shubunkins, and Fantails
  • Suckermouth catfish
  • Dwarf suckers
  • Neon Tetras

When choosing tank mates for your Ryukin goldfish, it is important to choose fish that are similar in size and temperament.

You should also avoid keeping them with aggressive fish that could harass or bully them.

Differentiating Between Male and Female Ryukin Goldfish

Male and female Ryukin goldfish can be distinguished by their appearance. Males tend to have longer fins, while females have shorter fins.

Males also tend to be larger than females. Another way to tell the difference between male and female Ryukin goldfish is by looking at their vent area.

The vent is located between the anal fin and the tail fin. On males, the vents are rounder, while on females, they are more oval-shaped.

How to Breed Ryukin Goldfish

Breeding Ryukin goldfish is not difficult, but it does require some preparation.

You will need to set up a breeding tank that is at least 30 gallons in size and has a sandy substrate. 

To induce spawning, you can raise the water temperature to 80°F for a few days. Once the female Ryukin goldfish is ready to lay her eggs, she will do so on the plants or other surfaces in the tank.

The male Ryukin goldfish will then fertilize the eggs, which will take two weeks to hatch. After hatching, you can feed them baby brine shrimp or other small foods.

As they grow, you can gradually start to feed them larger foods.

Additional Tips for Ryukin Goldfish Care

It is important to provide your Ryukin goldfish with plenty of hiding spots in their tank. This can be achieved by adding caves, plants, and other decorations.

Ryukin goldfish are messy eaters, so it is important to do regular water changes to keep the tank clean.

They are also sensitive to disruption in their environment, so make sure you avoid sudden changes.

Be sure to quarantine new fish before adding them to your Ryukin goldfish tank. This will help to prevent the spread of disease.


Ryukin goldfish have a unique appearance which makes them hugely popular with fish owners.

They are extremely low maintenance which makes them great for beginners.

Since they can live up to more than 15 years with proper care, they are ideal to have in your aquarium.

They do, however, need a big fish tank as they like to swim around.

Because of their social and peaceful nature, Ryukin goldfish make great tank companions for other fish. But you should avoid putting aggressive fish at all costs.

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