Telescope Goldfish Care: Complete Guide for Beginners

Looking for keeping Telescope Goldfish in your aquarium? You will unpack their characteristics, understand their needs, and discover ways to provide an optimal environment. Following this guide, you’ll be a step closer to becoming an expert in Telescope Goldfish care.

telescope goldfish

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Telescope Goldfish Species Profile and Identification

The Telescope Goldfish, also known as Carassius auratus, is a unique variant of the household goldfish. Unlike their familiar counterparts, these captivating creatures are recognized for their distinct, protruding eyes resembling a telescope.

  • Appearance: Demekins, as they are also commonly known, exhibit a variety of colours ranging from red, orange, black, brown, white, to unique blends such as calico, chocolate-and-blue, and kirin. Their set of prominent telescope eyes, often metallic, matted, or nacreous in scale type, sets them apart. They can reach sizes of approximately 4 to 10 inches long (~10 to 25 cm).
  • Temperament: As calm aquatic creatures, they harmoniously coexist with other fish sharing a similar laid-back demeanor.
  • Lifespan: They have an impressive lifespan of 6 to 25 years, allowing for a long term fish-keeping experience.

They closely resemble the Ryukin and Fantail goldfish in body structure, exhibiting a deep body and long, flowing fins. Some Demekins display veiled fins while others sport broad or short fins, much like the “China doll.” Despite their differences, one thing remains consistent. Their unique eye morphology, while intriguing, calls for a level of care and attention beyond the usual goldfish.

This engaging species is more than its unusual and captivating gaze. With its range of colours, calm demeanor, and substantial lifespan, the Telescope Goldfish offers enthusiasts a fascinating venture into the realm of fish-keeping.

Telescope Goldfish Supplies

To care for a telescope goldfish, there are several essential supplies that you must have.

  • Aquarium: A 20-gallon (75-liter) aquarium is the minimum requirement for a telescope goldfish. Upgrading to a larger tank gives your fish more space to explore and prevents overcrowding.
  • Filter: Invest in an aquarium filter that can handle the size of your tank. Goldfish produce a lot of waste, so a good filter is crucial. Preferably, obtain a filter that can process the entire water volume of the aquarium at least three to four times per hour.
  • Water Conditioner: To keep your fish healthy, use a water conditioner to neutralize harmful chemicals in tap water.
  • Heater: Though Telescope Goldfish is usually a cold water fish, maintaining a water temperature between 68-75 degrees Fahrenheit (20-24 degrees Celsius) goes a long way to ensure its wellbeing. Hence, an aquarium heater and thermometer might come in handy.
  • Test Kit: Regular water test kits are necessary to keep a check on pH, ammonia, nitrate, and nitrite levels, ensuring your fish has the perfect water condition.
  • Food: Goldfish are omnivores, and a mixed diet of dry pellets, fresh vegetables, and occasional live or frozen food provides them with the necessary nutrition.
  • Decor: Plenty of hiding places using aquarium-safe decorations and plants is beneficial for your goldfish. At a minimum, add a couple of caves or similar structures.

This list includes the basic equipment you’ll need to ensure your telescope goldfish stays in the best condition possible. The focus always should be on creating an optimal environment that mimics their natural habitat.

Telescope Goldfish Tank Setup

When setting up a tank for your telescope goldfish, start with a minimum tank size of 20 gallons (75 liters). This allows enough swimming space for the goldfish which are typically 4 to 10 inches long.

  • Choose a freshwater tank, which is a suitable environment for this breed.
  • To further mimic their natural habitat, include live aquatic plants in your setup. More than serving as a decoration, these plants generate oxygen and absorb harmful chemicals, contributing to healthy water conditions.

Keeping the goldfish comfortable is also pivotal. Add caves to give them a feeling of security. You can use artificially made aquarium caves or natural stones but ensure they have smoothened edges to prevent the fish from hurting its extended eyes.

The telescope goldfish prefer a substrate of fine sand or smooth gravel. It’s known for foraging behavior and may scratch its belly or mouth on sharp substrates.

Keep the water temperature between 65–75°F (18–24°C), as this breed is sensitive to sudden temperature changes. A good quality heater, while not always required, is useful to maintain a constant temperature, especially in cooler climates.

Lighting should be kept dim, as bright light can damage their sensitive eyes. You should also prevent exposure to direct sunlight, which may heat the tank rapidly and foster harmful algal blooms.

Lastly, a powerful filter is required to maintain clean water. Consider a filter with adjustable flow, as powerful currents can stress your telescope goldfish.

In the end, setting up the tank anticipates the needs of your goldfish and makes its home as natural and comfortable as possible. A carefully planned and maintained setup will reward you with a happy and healthy telescope goldfish.

Telescope Goldfish Water Requirements

When it comes to caring for your Telescope Goldfish, water plays a paramount role. Maintaining the correct water conditions is essential for the well-being of your pet.

Firstly, temperature is crucial. As cold-water fish, Telescope Goldfishes thrive in temperatures between 65°F to 72°F (18°C to 22°C). It’s critical to avoid drastic temperature changes as it can cause stress leading to potential health issues.

Secondly, pH levels also need your attention. A balanced pH range for these goldfish is typically between 6.0 and 8.0. Make sure to monitor it regularly to prevent any health repercussions from pH imbalance.

Then there’s water hardness with an ideal range of 6-18 dH for these species. So make sure your tank mirrors these conditions, as it will be conducive to their long-term well-being.

You should also be aware of Ammonia, Nitrate, and Nitrite levels. These should be kept at 0 ppm (parts-per-million) as even minimal amounts can be hazardous. Regular water tests are required to ensure levels are in check.

  • Temperature: 65°F to 72°F (18°C to 22°C)
  • pH Level: 6.0 – 8.0
  • Water Hardness: 6-18 dH
  • Ammonia, Nitrate, Nitrite levels: 0 ppm

Be conscious to change about 20-25% of the tank water every week to ensure the water stays clean, and that harmful chemicals do not build up. A high-quality aquarium filter is recommended to help in maintaining water quality.

Remember, satisfactory water conditions are directly linked with the lifespan and happiness of your telescope goldfish. Make water care a priority when taking care of your aquatic pet.

Telescope Goldfish Diet and Feeding

The Telescope Goldfish is an omnivorous species. This means it thrives on a diet that includes both plant-based and meaty foods. As a goldfish owner, understanding their dietary needs is fundamental to their health and longevity.

One of the essential things to remember is that these fish have quite distinctive eating habits. They of course love to graze and therefore, you must provide them with a balanced diet at regular intervals of time. To formulate an ideal feeding plan, here’s what you need to know:

  • Flake and Pellet Foods: Mostly comprising of vegetables and small amounts of protein, these form the staple diet for goldfish. These foods are easy to digest and essential for their growth.
  • Live Foods: Brine shrimp, Daphnia, and bloodworms are excellent sources of proteins. Besides, they add variety to their diet and stimulate natural foraging behavior.
  • Frozen or Freeze-dried Foods: These are good alternative protein sources when live foods are not available.
  • Vegetables: Spinach, peas, lettuce, cucumber are some of the veggies that goldfish relish.

Feed your Telescope Goldfish 2-3 times a day, ensuring that the feed size is small enough to be consumed within two minutes. Overfeeding can lead to severe health problems. Always remember to supply them with as much food as they can consume within a reasonable time to maintain a clean tank environment.

A varied diet is the key to a healthy and happy Telescope Goldfish. A mix of commercial foods, combined with live foods and veggies achieves the best balance. Regular feeding, following an optimal schedule, can lead to a robust Telescope Goldfish with vibrant colors and more extended life.

Telescope Goldfish Care Schedule

Caring for your telescope goldfish isn’t a one-off task—it requires daily, weekly, and monthly routines. Here’s an ideal sequence.

Daily Routines:

  • Feeding: Feed your telescope goldfish once or twice a day with well-balanced, nutrient-rich fish food. Remember, overfeeding can cause many health issues.
  • Observation: Take a few minutes each day to observe your goldfish’s behavior. Abnormal behavior could signify potential problems or health issues.

Weekly Routines:

  • Partial Water Changes: Change approximately 20% of the tank’s water every week to maintain clean and fresh conditions.
  • Tank Cleaning: Use an aquarium vacuum cleaner to remove droppings from your fish and leftover food particles.
  • Testing: Conduct a routine water check for pH, ammonia, nitrate levels using a freshwater testing kit. Ideally, the pH should be between 7.0 and 8.4, and ammonia and nitrate levels should be zero.

Monthly Routines:

  • Filter Cleaning: Clean your aquarium filter once a month to ensure perfect operation. Make sure not to use any chemicals or soap.
  • Ornamental Cleaning: Clean any bits of ornaments, plants, and decorations in the tank to avoid algae formation.

By following this straightforward routine, you can ensure your telescope goldfish stays healthy and happy.

Telescope Goldfish Health Problems

Just like any other living creature, telescope goldfish can encounter several health problems throughout their life. However, don’t fret, with proper care and vigilance, you can prevent most of these issues and ensure your fish live a healthy life.

  • Swim Bladder Disease is a common issue in goldfish. The symptoms include swimming sideways or upside down. A change in diet and water temperature often helps in recovery.
  • Fungal Infections appear as white cotton-like growth on the fish’s body. To cure this, isolate the affected fish and treat the tank with a fungicide.
  • Fin Rot, characterized by ragged and discolored fins, is another common issue. Again, improving water quality and administering suitable treatment helps.
  • Eye Infections are specific to telescope goldfish due to their protruding eyes. In case of any symptoms, consult a vet for the right course of action.

Remember, the best form of cure is prevention. Regular water changes, a good diet, and a well-maintained tank go a long way in keeping your goldfish healthy. Keep an eye for any unusual behavior or changes in your fish’s appearance. After all, early detection is key to successful treatment.

Telescope Goldfish Tank Mates

Selecting tank mates for your Telescope Goldfish requires thought. You need calm, non-aggressive fish that share the goldfish’s leisurely swimming speed and preference for cooler temperatures.

  • White Cloud Mountain Minnows: These are peaceful, cold-water companions ideal for co-habitation. They don’t compete with your Telescope Goldfish for food, so your pet can eat without stress.
  • Zebra Danios: Equally calm, they cohabit nicely. However, they’re faster swimmers. Monitor the tank to ensure these Danios don’t usurp the Goldfish’s food.
  • Weather Loaches: These bottom-dwelling fish are an excellent choice. They dwell at different water levels, avoiding clashes while providing interesting contrast in movement and space occupation.

Protection matters. Avoid aggressive or fin-nipping species like Tiger Barbs or Betta Fish. Remember, though, even calm species may nibble at the Telescope Goldfish’s flowing fins out of curiosity. Regular monitoring ensures that these peaceful cohabitants live comfortably together. Avoid fish requiring warmer water, like Guppies or Cichlids.

Size compatibility is key. Small quick swimmers may stress larger, slower Telescope Goldfish. Also, Guppies or Tetras may end up as snacks for a full-grown telescope! For compatibility, consider the adult sizes of potential tank mates. A similar temperament to the Telescope Goldfish is crucial.

Choosing the right tank mates presents no vast difficulty. You want peaceful, similarly-paced swimmers that enjoy cooler water and don’t compete for food. Plan, observe, and adjust as needed, and your Telescope Goldfish tank will exhibit a beautiful, harmonious aquatic display.

Telescope Goldfish Breeding

Breeding your own Telescope Goldfish might seem complex, but judging by their widespread popularity, you can confidently take the plunge. Let’s demystify the process.

Firstly, you need to know that a healthy Telescope Goldfish becomes ready to breed when it reaches a size of 4 inches or approximately 10 cm. It typically takes them a year to reach this size. Remember, maintaining a balanced diet plays a crucial role in reaching their breed-ready size.

Identifying the sex of your Telescope Goldfish is crucial. Male goldfish typically develop tiny white dots on the gill covers, known as tubercles, during the breeding season. On the other hand, females appear more rounded and plump when full of eggs.

After identification, follow these steps:

  • Start by preparing a separate breeding tank as their regular habitat can be risky for eggs.
  • Place an egg-spawning mop or dense plants for the female telescope to lay eggs.
  • Fill the tank with freshwater and maintain a temperature around 20°-23°C (68°-73°F). A small temperature drop can often trigger spawning.
  • Transfer the identified pair of breeders to the new tank.

After successful spawning, transfer the parents back to their original tank. This is to ensure the security of the fry since goldfish have a tendency to eat their own eggs. In approximately 5-7 days, you’ll notice tiny goldfish fry swarm the tank.

Provide the fry with equal care, feeding them special fry food, and you’ll soon have a healthy family of Telescope Goldfish. Breeding them is indeed a rewarding experience.


As you can see, taking care of a telescope goldfish may need a bit of effort initially, but it’s certainly worthwhile when you observe its beauty and unique characteristics. By providing the proper tank conditions, diet, and care, these stunning aquatic pets will thrive and bring joy into your home.

We hope this guide has been helpful, and feel free to leave a comment if you have any additional questions or experiences to share.

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