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

If you’re considering adding a telescope goldfish to your aquarium, it’s important to understand their unique needs and care requirements. These fish are known for their distinctive appearance, with protruding eyes that give them a telescope-like appearance. But beyond their looks, they require specific conditions to thrive.

Telescope Goldfish require a tank size of at least 20 gallons per fish, pH levels between 6.0-8.0, and a temperature range of 65-78°F. They are omnivores and need a varied diet of high-quality pellets or flakes, vegetables, and occasional live or frozen foods. They also require plenty of swimming space and a soft substrate to prevent damage to their delicate fins and protruding eyes.

First and foremost, telescope goldfish need plenty of space to swim and explore. A minimum of 20 gallons per fish is recommended, and larger tanks are even better.

They also need a well-filtered tank with plenty of oxygenation, as they produce a lot of waste. In terms of diet, telescope goldfish require a varied diet that includes both pellets and live or frozen foods.

It’s also important to monitor the water quality in your telescope goldfish tank regularly. These fish are sensitive to changes in water chemistry, so regular water changes and testing are essential.

With proper care and attention, your telescope goldfish can live a long and healthy life in your aquarium.

telescope goldfish 2

Species Summary

If you’re considering adopting a telescope goldfish, it’s important to understand the basics of their care. Here’s everything you need to know about these unique fish.


Telescope goldfish are a type of fancy goldfish that originated in China over a thousand years ago. They were selectively bred for their unique appearance and are now popular worldwide as pets.


With proper care, telescope goldfish can live up to 20 years or more. However, their lifespan can be significantly shortened if they are not cared for properly.


Telescope goldfish are easily recognizable by their protruding eyes, which give them a telescopic appearance.

They come in a variety of colors, including black, red, orange, and white. Their fins are long and flowing, and they have a round, chubby body.


Telescope goldfish can grow up to 6-8 inches in length, with some even reaching 10 inches or more. They are relatively slow-growing fish, so it’s important not to overfeed them or they may become overweight.

Growth rate

Telescope goldfish have a slower growth rate than other types of goldfish, and it can take them up to three years to reach their full size.

It’s important to provide them with adequate space and a healthy diet to ensure they grow properly.

Behavior & Temperament

Telescope goldfish are generally peaceful and get along well with other goldfish. They are not aggressive and can be kept with other fish of similar size and temperament.

However, they can be easily startled and should be kept in a calm, low-traffic area of your home.

Male vs Female

It can be difficult to tell the difference between male and female telescope goldfish, as they have similar physical characteristics.

However, during breeding season, males will develop small white bumps on their gill plates, while females will have a rounder, more plump appearance.

When I first adopted my telescope goldfish, I was amazed by their unique appearance and peaceful temperament.

With proper care and attention, they have become a beloved member of my family. If you’re considering adding a telescope goldfish to your home, be sure to provide them with the care and attention they deserve.

Tank Setup

Setting up a suitable tank for your telescope goldfish is essential for their health and wellbeing. Here are some important factors to consider:

Tank Size

The size of your tank is crucial for the health of your telescope goldfish.

A single goldfish requires a minimum of 20 gallons of water, and an additional 10 gallons for each additional fish.

If you plan on having multiple goldfish, it is important to provide them with adequate space to swim and grow.


Goldfish do not require special lighting, but they do need a consistent light source.

A timer can be used to ensure that your goldfish receive 10-12 hours of light per day, which is necessary for their overall health.

Filtration & Aeration

A good filtration system is essential for maintaining a healthy and clean environment for your goldfish.

The filter should be able to handle at least 2-3 times the volume of water in the tank per hour. Aeration is also important for providing oxygen to the water and preventing the buildup of harmful gases.


Telescope goldfish are coldwater fish and do not require a heater unless the room temperature drops below 65°F.

If you do need a heater, make sure to choose one that is appropriate for the size of your tank and that has a thermostat to regulate the temperature.


Avoid using sharp or rough substrates, as they can damage your goldfish’s delicate fins.

Smooth gravel or sand is a good option, and should be cleaned regularly to prevent the buildup of waste and debris.


Adding decorations to your tank can provide hiding places for your goldfish and create a more natural environment.

However, be careful not to overcrowd the tank, as this can lead to poor water quality and stress for your fish.


Live plants can help to oxygenate the water and provide a natural food source for your goldfish.

However, be sure to choose plants that are suitable for a goldfish tank and that will not be uprooted or eaten by your fish.

By following these guidelines, you can create a comfortable and healthy environment for your telescope goldfish to thrive in.

Water Quality

When it comes to taking care of your telescope goldfish, maintaining good water quality is crucial.

Poor water quality can lead to a range of health problems for your fish, including fin rot, swim bladder disease, and even death. Here are some key factors to consider:

Water Temperature

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

If the water is too cold, your fish may become sluggish and have trouble digesting food. If the water is too warm, your fish may become stressed and more susceptible to disease.

Water pH

The ideal pH range for telescope goldfish is between 7.0-8.4. It’s important to monitor the pH level regularly, as sudden changes can be harmful to your fish.

If the pH level is too low, your fish may become stressed and more susceptible to disease. If the pH level is too high, it can lead to ammonia toxicity.

Water Hardness

Telescope goldfish prefer moderately hard water with a range of 6-16 dGH. Soft water can cause stress and health problems for your fish, while hard water can lead to mineral buildup in the tank.

Water Changes

Regular water changes are essential for maintaining good water quality. Aim to change 20-30% of the water in your tank every week.

This will help remove harmful toxins and debris from the water, and keep your fish healthy and happy.

Personally, I have found that monitoring water quality is one of the most important aspects of caring for my telescope goldfish.

By maintaining the right temperature, pH level, and water hardness, and performing regular water changes, I have been able to keep my fish healthy and thriving.

Tank Maintenance

Keeping your telescope goldfish healthy and happy requires proper tank maintenance. Here are a few tips to keep in mind:

First, make sure to clean your tank regularly. It’s recommended to do a partial water change of about 25% of the tank’s volume every week. This will help remove excess waste and debris that can harm your fish.

Second, monitor the water quality. Invest in a water testing kit to check levels of ammonia, nitrite, and nitrate. High levels of these chemicals can be toxic to your fish. If levels are too high, do a water change and consider adding a water conditioner to neutralize the chemicals.

Third, keep the tank well-filtered. Invest in a good quality filter that can handle the size of your tank and the number of fish you have. A filter will help remove waste and debris, and keep the water clean.

Fourth, avoid overfeeding your fish. Overfeeding can lead to excess waste and uneaten food, which can harm your fish and dirty the tank.

A good rule of thumb is to feed your fish small amounts 2-3 times a day, and only give them what they can eat in a few minutes.

Finally, keep an eye out for any signs of illness or stress in your fish.

Common signs include lethargy, loss of appetite, and abnormal swimming behavior. If you notice any of these signs, take action immediately to prevent further harm to your fish.

Personally, I find that taking care of my telescope goldfish is a relaxing and rewarding experience. With proper tank maintenance, you can enjoy a beautiful and healthy fish for years to come.

Tank Mates

When it comes to keeping telescope goldfish, choosing the right tank mates is crucial to ensure their health and happiness. Here are a few things to consider:

Compatible Fish Species

Telescope goldfish are generally peaceful and get along well with other slow-moving, non-aggressive fish. Some good options for tank mates include:

  • Fancy goldfish
  • Bristlenose plecos
  • Mystery snails
  • White cloud mountain minnows

Incompatible Fish Species

While telescope goldfish are generally friendly, there are some fish species that are not compatible with them. Avoid keeping these fish with your telescope goldfish:

  • Cichlids
  • Barbs
  • Tetras
  • Guppies

Can Telescope Goldfish Live Together?

Telescope goldfish can live together, but it’s important to keep in mind that they are messy eaters and produce a lot of waste.

As a result, you’ll need to have a larger tank than you would for other fish species. A good rule of thumb is to have a minimum of 20 gallons of water per fish.

Personally, I’ve had success keeping my telescope goldfish with fancy goldfish and a few snails. They all get along well and seem to enjoy each other’s company.


Proper diet is essential for the health and well-being of your telescope goldfish. In this section, we will discuss what to feed your fish, how often to feed them, and some tips to keep in mind.

What To Feed

Telescope goldfish are omnivores, meaning they eat both plant and animal matter. A balanced diet should include a variety of foods, such as:

  • High-quality commercial pellets or flakes
  • Frozen or live foods like brine shrimp, bloodworms, and daphnia
  • Fresh vegetables like peas, lettuce, and spinach

It’s important to avoid overfeeding your fish, as this can lead to health problems.


Feed your telescope goldfish once or twice a day, only giving them as much as they can eat in 2-3 minutes. Overfeeding can cause digestive problems and water quality issues.


Here are some tips to keep in mind when feeding your telescope goldfish:

  • Remove any uneaten food after feeding to prevent it from decomposing and polluting the water.
  • Soak pellets or flakes in water for a few minutes before feeding to prevent them from expanding in the fish’s stomach.
  • Offer a variety of foods to ensure a balanced diet.
  • Avoid feeding your fish human food, as it can be harmful to their health.

Remember, a healthy diet is key to keeping your telescope goldfish healthy and happy.

When I first got my telescope goldfish, I made the mistake of overfeeding him. He quickly became bloated and lethargic, and I had to adjust his diet and feeding schedule to get him back on track. Now, I make sure to only feed him what he needs and remove any uneaten food after a few minutes.

Common Diseases


Telescope goldfish are generally hardy fish, but they can still fall prey to various diseases. Some of the most common diseases that affect telescope goldfish include:

  • Ich (white spot disease)
  • Fin rot
  • Dropsy
  • Swim bladder disease


If your telescope goldfish is suffering from a disease, there are some common symptoms to look out for:

  • White spots on the body and fins (ich)
  • Ragged or frayed fins (fin rot)
  • Bloated body with scales sticking out (dropsy)
  • Difficulty swimming or floating upside down (swim bladder disease)


If you notice any of the symptoms listed above, it is important to act quickly to treat your fish. The treatment will depend on the specific disease, but some common treatments include:

  • Medications
  • Water changes
  • Isolation of the sick fish


Prevention is always better than cure when it comes to fish diseases. Some ways to prevent diseases in your telescope goldfish include:

  • Keeping the water clean and well-maintained
  • Avoiding overcrowding in the tank
  • Quarantining new fish before adding them to the tank

Personally, I have had experience dealing with fin rot in my telescope goldfish. I noticed that the fins were ragged and frayed, and the fish seemed lethargic. I acted quickly and treated the fish with medication and frequent water changes. Within a few days, the fish was back to its normal self.

Signs of a Healthy Telescope Goldfish

When it comes to caring for your telescope goldfish, it’s important to be able to recognize the signs of a healthy fish. Here are a few things to look for:

  1. Clear eyes: Your goldfish’s eyes should be clear, bright, and free of any cloudiness or discoloration.
  2. Active swimming: A healthy goldfish should be swimming around its tank, exploring and interacting with its environment.
  3. Good appetite: Your goldfish should be eager to eat, and should be consuming its food without any difficulty.
  4. Smooth scales: A healthy goldfish will have smooth, shiny scales that are free of any bumps, lesions, or discoloration.

Additionally, you should be monitoring your goldfish’s behavior on a regular basis. If you notice any changes in its swimming patterns, appetite, or overall demeanor, it could be a sign of an underlying health issue.

It’s always better to be safe than sorry, so don’t hesitate to reach out to your veterinarian if you have any concerns.

Personally, I always keep a close eye on my goldfish’s behavior and appearance. I’ve found that by doing so, I’m able to catch any potential health issues early on and address them before they become more serious.

By staying vigilant and proactive, you can help ensure that your telescope goldfish stays happy and healthy for years to come.

Signs Your Telescope Goldfish is Sick

If you’re a proud owner of a telescope goldfish, it’s important to keep an eye on their behavior and physical appearance. Here are some signs that your fish may be sick:

  1. Unusual swimming behavior: If your fish is swimming erratically or struggling to maintain its balance, it could be a sign of swim bladder disease or another health issue.
  2. Changes in appetite: A sudden loss of appetite or overeating can both be signs of illness.
  3. Lethargy: If your fish is spending most of its time at the bottom of the tank or not moving much, it could be a sign of a health issue.
  4. Abnormal growths or discoloration: Check your fish regularly for any unusual bumps, lumps, or changes in color.

If you notice any of these signs, it’s important to take action quickly to help your fish recover. Consult with a veterinarian who specializes in fish health, or a knowledgeable pet store employee who can advise you on treatment options.

Personal Anecdote: I noticed that my telescope goldfish was spending a lot of time at the bottom of the tank and not eating much.

After consulting with a pet store employee, I learned that my fish had a bacterial infection and needed a course of antibiotics. Thanks to quick action, my fish made a full recovery!


telescope goldfish

Breeding Setup

To breed telescope goldfish, you need to set up a breeding tank. The breeding tank should be at least 20 gallons and have a sponge filter.

The water temperature should be around 68-74°F, with a pH level of 7.0-7.4. You should also add some plants or spawning mops to give the fish a place to lay their eggs.

How To Breed

Before breeding, make sure that the fish are healthy and well-fed. You can tell when the fish are ready to breed when the males start chasing the females around the tank.

Once you see this behavior, you can introduce the male and female into the breeding tank. The male will start chasing the female around the tank and nudging her belly.

This will stimulate the female to lay her eggs. The male will then fertilize the eggs as they are laid. After the eggs are laid, you should remove the parents from the breeding tank to prevent them from eating the eggs.


After the eggs are laid, they will hatch in about 4-7 days. You should keep the tank well-aerated and do regular water changes to keep the water clean.

Once the fry hatch, you should feed them small amounts of baby brine shrimp or powdered fish food several times a day. It’s important to note that not all telescope goldfish will breed successfully.

Sometimes the fish will eat their own eggs or the eggs will not hatch. Don’t get discouraged if your first attempt at breeding is unsuccessful.

With patience and practice, you can become a successful telescope goldfish breeder.

I personally found breeding telescope goldfish to be a rewarding and exciting experience. Watching the fish lay their eggs and seeing the fry hatch and grow was truly amazing. If you’re up for the challenge, breeding telescope goldfish can be a fun and rewarding hobby.

Product recommendations for Telescope Goldfish:

  1. Hikari Lionhead Pellets – These pellets are specifically designed for Telescope Goldfish, providing a balanced diet that is high in protein and essential nutrients.
  2. Seachem Prime – This water conditioner is perfect for Telescope Goldfish, neutralizing harmful toxins and chemicals in the water and keeping your fish healthy and happy.
  3. Aqueon LED Aquarium Light Fixture – This high-quality LED light fixture is perfect for Telescope Goldfish, providing bright and energy-efficient lighting that will help your fish thrive.
  4. API Freshwater Master Test Kit – This comprehensive test kit is perfect for Telescope Goldfish owners, allowing you to monitor the water quality of your aquarium and ensure that your fish are healthy and happy.
  5. Zoo Med Nano 10 External Canister Filter – This powerful and efficient canister filter is designed for small aquariums and is perfect for keeping the water in your Telescope Goldfish tank crystal clear.
  6. Tetra Whisper Air Pump – This powerful and reliable air pump is perfect for Telescope Goldfish, providing a steady flow of oxygenated water that will keep your fish healthy and happy.
  7. API Stress Coat Water Conditioner – This aquarium conditioner is perfect for Telescope Goldfish, reducing stress and promoting healing in your fish by forming a protective slime coat on their skin.
  8. Fluval Bug Bites Goldfish Formula – This high-quality fish food is perfect for Telescope Goldfish, providing a balanced diet that is rich in protein and essential nutrients.
  9. Fluval Biomax Bio Rings – These bio rings are perfect for Telescope Goldfish, providing efficient biological filtration that will keep the water in your aquarium clean and clear.


Now that you have read this article, you should feel confident in your ability to care for your telescope goldfish. Remember to keep their tank clean and well-maintained, provide them with a balanced diet, and monitor their behavior for any signs of illness.

If you notice any issues with your fish, don’t hesitate to consult with a veterinarian who specializes in aquatic animals. They can provide you with expert advice and guidance to help you keep your fish healthy and happy.

By following the tips and guidelines outlined in this article, you can ensure that your telescope goldfish live long, healthy lives.

Remember, these beautiful fish are a joy to watch and care for, and with a little effort and attention, you can provide them with the best possible care.

I hope you found this article helpful and informative. As a fish enthusiast myself, I know how rewarding it can be to care for these amazing creatures. Good luck with your telescope goldfish, and happy fishkeeping!


Telescope goldfish are beautiful and unique fish that require special care to keep them healthy and happy. Here are some frequently asked questions about telescope goldfish care:

Q: How often should I feed my telescope goldfish?

A: You should feed your telescope goldfish small amounts of food 2-3 times a day. Overfeeding can lead to health problems, so be careful not to give them more than they can eat in a few minutes.

Q: Do I need a special filter for my telescope goldfish tank?

A: Yes, telescope goldfish produce a lot of waste and require a filter that can handle their high bioload. A canister filter or power filter with a high flow rate is recommended.

Q: Can I keep my telescope goldfish with other fish?

A: Telescope goldfish are peaceful and can be kept with other goldfish of similar size and temperament. However, they should not be kept with aggressive or fin-nipping fish.

Q: How often should I change the water in my telescope goldfish tank?

A: You should change 20-30% of the water in your telescope goldfish tank every week to keep the water clean and healthy for your fish.

Q: Do I need to add salt to my telescope goldfish tank?

A: Adding a small amount of aquarium salt to your telescope goldfish tank can help prevent diseases and promote healing. However, you should be careful not to add too much salt, as it can harm your fish.

Personal Anecdote:

When I first got my telescope goldfish, I didn’t know much about their care requirements. I made the mistake of overfeeding them and not changing the water often enough.

As a result, they developed health problems and I had to spend a lot of time and money to get them back to good health. I learned the hard way that proper care is essential for keeping telescope goldfish happy and healthy.

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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