Goldfish are incredible creatures that are much more complex than people realize.
There are more than 125types of goldfishin the world.
One of these beautiful creatures is known as The Fantail Goldfish.
They are beautiful and graceful creatures that are able to relieve your stress without saying a word.
Let's dive into the tank and learn more about the gloriousFantail Fancy Goldfish.
From History of the fantail goldfish:
Many years ago, the Chinese began breeding carp that were commonly found in their water sources. They were relatively easy to catch because they loved calm rivers, ponds and lakes.
The breeding process was started with the intention of mass producing fish already caught in captivity to feed many people much faster and easier.
During the mass breeding process, some carp were born with a yellowish-orange hue instead of the silvery carp color.
The Chinese became fascinated with this new hue and would separate these carp from the others.
They would then only allow the colored carp to mate with other colored carp. Thus the Goldfish was born!
All types of goldfish are derived from the carp. This explains why many of them are very similar to them.
However, there are some goldfish, known as Fancy Goldfish, that barely resemble the carp.
The original beautiful goldfish first appeared in the 1400's in China during the Ming Dynasty.
They had chubby, egg-shaped bodies and split tail fins. This original fancy goldfish is known as the Fantail Fancy Goldfish.
While many goldfish species have the split flukes and are technically "fantailed," they are not necessarily a Fantail Fancy Goldfish.
Fantail Fancy Goldfish are considered their own goldfish species and are recognized as such at goldfish shows.
Physical Characteristics Of The Fantail Goldfish:
In order for a Fantail Fancy Goldfish to enter a show, they must meet certain show standards. Otherwise, the judges will not consider the fish a worthy specimen of the species.
The show standards for the Fantail Fancy Goldfish include body shape and size, tail fin specifications, as well as their scales and coloration.
The body of the Fantail goldfish should be round, plump and similar to the shape of an egg. The shorter the body is in length (compared to overall depth), the better the show specimen is considered. However, the judges will accept a body depth of 3/5 or more of the body height.
The specifics of the tail fin of the Fantail Fancy Goldfish are of particular interest to the judges.
They should be tall and stable (not hanging heavily). The split should be clearly divided and forked.
Seen from the side, the upper lobe of the caudal fin should be longer than the lower lobe. There should be a single, high dorsal fin that remains upright.
The Fantail Fancy Goldfish can develop as any number of colors and patterns. They can be a variety of solid colors, including red, orange, and yellow. It can also be different patterns, including calico.
The color or pattern of the Fantail Fancy Goldfish is not as important to the show judges as many other factors.
However, solid fin colors are an ideal physical trait for the goldfish show judges.
Difficulty of fantail goldfish care:
The Fantail Fancy Goldfish can be an excellent choice for novice fish owners.
They can be relatively easy to care for as long as you understand and apply the basic goldfish requirements.
They are not fragile fancy goldfish (delicate fancy goldfish include theBubble Eyed Extravagant Goldfish,Telescoop Eyed Fancy Goldfish, etc.) which means that they are not easily affected by the filtration or equipment in the aquarium.
The Fantail Goldfish is a skilled swimmer, even though it is neither fast nor slow.
Because of its swimming ability, it should be placed in an aquarium or outdoor pond with similarly skilled fish.
In other words, he shouldn't be tank mates with theComet Goldfishor other very agile swimmers, nor should it be placed with extremely slow swimmers such as the Bubble Eyed Fancy Goldfish orLionhead fancy goldfish.
If you are considering starting a goldfish aquarium or aoutside pondwith goldfish in it, then you need to make sure you provide them with a healthy environment.
Goldfish, for example, need filtration regardless of habitat.
The filtration ensures that the water they live in is safe for them and free of harmful bacteria.
If you plan to use tap water to fill the tank or pond, you will need awater conditioner.
The water conditioner purifies the tap water of harmful heavy metals and chlorine (which are toxic to fish).
You should never overcrowd your goldfish environment.
The rule of thumb to follow for a safely populated goldfish aquarium or outdoor pond is to plan on at least 20 gallons of water per fish.
For example, if you want five goldfish in the habitat, you should prepare to purchase a 100-gallon aquarium.
This may seem excessive.
The fish don't stay small for very long, however, and they need room to grow, swim, and plenty of oxygenated water to breathe.
Every two weeks, 30% of the tank water should be replaced. The new water should be treated with a water conditioner before adding it to the tank.
Filter parts or decorations that require cleaning should be in the removed tank water.
Rinsing or cleaning them in untreated tap water can send your fish into shock when the item is returned.
You can also wash away the beneficial bacteria.
Gravel and fish never need to be removed from the aquarium during cleaning.
Gravel can be cleaned using a gravel vac.
Feeding and Feeding the Fantail Fancy Goldfish:
You may think that feeding goldfish is a piece of cake. You may believe goldfish just eatGoldfish flakes or goldfish pellets. However, this is not the whole truth!
Yes, these products can be fed to goldfish and they are readily available at any local pet store.
However, goldfish enjoy a variety of different foods.
They are omnivorous, so they will happily consume plant sources as well as meat sources.
Now don't think that you can offer your goldfish a pound of ground beef and they would happily eat it.
The truth is that their meat sources are a bit different. Goldfish, like the Fantail, enjoy:
- insects
- Worms
- Mosquito larvae
- Bloodworms
- Artemia
- flies
- ants
They will gladly accept any of these meat sources as a high protein meal. On the other hand, goldfish also enjoy plant-based meals such as:
- Plants (usually they will nibble on the live plants you place in the tank)
- Plant roots (goldfish are diggers, and they can uproot a live plant to nibble on the roots)
- To leaf through
- Vegetables including broccoli, pea puree and lettuce
- Fruits including blueberries and strawberries (cut up)
- Algae (they usually nibble on the algae growing in the aquarium)
When choosing what to feed your goldfish, consider combining the above items with their regular goldfish food.
For example, you can give your Fantail Fancy Goldfish some goldfish flakes as a first meal, a few worms as a second meal, and finally some leaves or lettuce as a third meal.
Goldfish should be fed two to three times a day. In general, they should be fed in the morning, afternoon and evening. However, this also depends on your schedule.
Goldfish flakes and pellets are good choices for a quick meal (usually at the busiest time of the day).
Regardless of what you feed your goldfish, or when you feed them, you should never overfeed them.
Goldfish are instinctive munchers. This suggests that they will eat just about anything at any time, and they can quickly gain weight if you let them.
Therefore, you should only feed your Fantail goldfish the amount of food they can consume in two to three minutes. Uneaten food will just sink to the bottom of the aquarium, become moldy and contaminate the water.
Habitat Requirements of the Fantail Fancy Goldfish:
A Fantail Fancy Goldfish can grow quite large if given the space to do so. They should be kept in a rectangular habitat.
Rectangular aquariums or outdoor ponds provide your fish with ample surface area to swim, grow and high quality oxygenated water to breathe.
The Fantail Goldfish is a hardy fish and so it should not be easily damaged by the filtration device, decor or other objects in the tank.
They require onefiltration systemwhich provides mechanical, biological and chemical filtration.
These three systems ensure that floating debris and other things in the water are removed.
As mentioned earlier, goldfish need a habitat that is not overcrowded with other inhabitants.
Each goldfish should have about 20 liters of water.
Therefore, if you have five Fantail Fancy Goldfish, they should live in a 100-gallon aquarium.
This rule of thumb has been drawn up to ensure adequate living conditions for the residents without them overlapping.
Another problem that can arise if a tank is overcrowded is excessive fouling.More inhabitants mean more waste.
The more waste there is in the water (which they use to breathe) the less oxygen is available.
Fantail Goldfish Personality and Temperament:
The fantail goldfish is a very interactive fish. They are known to anticipate their owner's arrival and enjoy their company.
They are not typical fish that are easily startled, nor are they usually shy.
In fact, the Fantail is very pleasant, friendly, docile and more interested in making friends with their tank mates than enemies.
They are not known to fight with other fish.
However, there are always exceptions to the rule.
They can become aggressive if a threat arises.
Potential Fantail Goldfish Health Issues:
Goldfish can be prone to a variety of health problems, especially if they are not properly cared for. Thishealth conditionsinclude but are not limited to:
1.Goldfish ME:Ichtyopthirius Multifiliis is a parasitic disease that has a marked effect on the scales of goldfish. This disease is also known as White Spot Disease, after the spots that suddenly appear.
2.Swim Bladder Disease:a common balance disorder in fish. This can be the result of several other health problems, including constipation, parasites, or poor nutrition.
3.Fin Rot/Tail Rot:this is a symptom of an underlying condition. This is a sign that will show as "rotting away" of your goldfish's fins or tail. Causes of this symptom are bacteria, parasites, fighting with other fish and stress.
4.Fungal infections
5.Anker Worm:A highly contagious crustacean commonly found in koi fish and goldfish. These crustaceans cause your fish to exhibit body friction and experience inflammation and breathing problems.
6.Fish lice:Also crustaceans that are common among outdoor pond inhabitants. The fish will show body rubbing, loss of color and loss of appetite. These crustaceans can inject the fish with viruses and bacteria that can cause further health problems.
7.Ulcers and tumors
Temperament:Community
Family:Cyprinidae
native to:Chinese in Japan
Eating pattern:Omnivorous: Can be fed with commercial pellets and fish flakes
Adult size:6" or more
Temperature:prefer water in the range of 65 - 78F
level of care:Easy for a beginner
Scientific name:Vergulde Carassius
Expected life span10 years or more
Environment:Fresh water
Fantail goldfish questions and answers
What is a Fantail Goldfish?
- Type: fantasy
- Colours: orange, silver, black, bronze, red, red/white
- Swimmer Type: Slow
- Temperament: calm
- Single or double tail: twins
- Care Level: Ideal for beginners
How much does a fantail goldfish cost?
$3 - $12 each
Are fantail goldfish good for beginners?
And
What are Compatible Tankmates for Fantail Goldfish?
Other slow swimmers; Black Moor, Ranchu, Lionhead, Bubble Eye, Ryukin
Note: Slow-swimming goldfish should not be placed with fast-swimming goldfish. Fast swimmers are aggressive eaters at feedings.
Features and Traits of Fantail Goldfish
How Big Does a Fantail Goldfish Get?
6 "- 12"
What Is the Lifespan of Fantail Goldfish?
10-15 years
Diet of fantail goldfish
What Does a Fantail Goldfish Eat?
- Pellets
- Live food (bloodworms, shrimp)
- Fruits & vegetables
- flake food
Tank Requirements for Fantail Goldfish
What Size Tank Does a Fantail Goldfish Need?
- Minimum: 20-30 litres
- Fish-to-tank ratio is 1" fish per 1 gallon of water
What should the water temperature be for a fantail goldfish; and do i have to have a heater for the tank?
- 65 - 78 degrees (F)
- A heater is required to keep the water at the right temperature.
Should I have an air stone (air pump) in my fantail goldfish's tank?
Yes, but be careful not to get too powerful due to the slow-swimming nature of the Fantail, which can impede the water movement caused by a large air stone.
Does a Fantail Goldfish's Aquarium Need a Filtration System?
- Yes, all goldfish should have a filtration system in their tank.
- Be careful that your filtration system's water intake is not too powerful for the Fantail, as they are slow swimmers and too much movement in the water can be difficult for your Fantail.
Final thoughts to recap:
Fantail Fancy Goldfish can be incredible pets. If properly cared for and kept in good health, they should have no problem living for decades and growing quite large.
They can be prone to health problems, but close observation, as well as quality water, should keep the health problems minimal and easy to treat.
Always purchase your Fantail Fancy Goldfish from a reputable pet store or breeder. If you buy them online, make sure you use a reputable seller.
Finally, Fantail Fancy Goldfish are a fantastic choice for those who experience stress on a daily basis, as their sheer presence can relieve you.
Getting started: air pumps and air stones
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Ryukin goldfish
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40 fun facts about goldfish
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A quick look at some awesome goldfish tattoos!
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Fantail goldfish
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GoldFish Diseases and Disorders
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FAQs
Fantail Goldfish - A beautiful goldfish - Care Fantail Goldfish? ›
Fantail goldfish are coldwater fish, requiring a water temperature of between 65° to 72° Fahrenheit. The ideal pH range is between 6.0 and 8.0, and the water hardness should be in the range of 5 to 19 dGH.
How long do fantail goldfish live for? ›Scientific Name | Carassius Auratus |
---|---|
Lifespan | 10 to 15 Years |
Temperament | Peaceful |
Tank Level | Medium |
Minimum Tank Size | 20 Gallons |
Goldfish (Carassius auratus) are social animals and when kept in groups can be seen regularly interacting with other goldfish. Keeping at least two goldfish in an aquarium is recommended to provide companionship and promote activity. Solitary fish can exhibit depression and lethargy.
How often do you feed fantail goldfish? ›Feed 2-3 times daily. It is important to avoid overfeeding goldfish as this can cause indigestion and/or contaminate the tank. In terms of the amount to feed, a good rule of thumb is to only feed an amount that the goldfish can consume in under two minutes or only feed as much as the size of the goldfish's eye.
Do fantail goldfish need tank mates? ›Fantails are sociable, gregarious fish that need to live in the company of other fish to thrive and do well. That means you can keep as many Fantails as you have space for. So, if you have a very large pond, you can have a large group of these gorgeous, friendly fish.
How big of a tank do I need for 2 fantail goldfish? ›Tank Size. As previously mentioned, Fantails grow to a fair size, so we recommend that you start with a 20 or 30-gallon tank, adding a further 10 gallons for each additional fish. Fantails are not fast swimmers, but they are dirty fish, producing lots of waste.
Can I put 1 goldfish in 2.5 gallon tank? ›Despite the popular misconception, Goldfish are NOT suitable fish for small tanks or bowls. They need at least 20 gallons for one fish, and 10 for each additional, and that's the minimum.
How many goldfish can I put in a 10 gallon tank? ›While it is feasible to house up to four little goldfish in a 10-gallon tank, only two are preferable. Two twisty-tail or bubble-eye goldfish can survive in a 10-gallon tank if they receive proper care.
How many goldfish can I put in a 5 gallon tank? ›The general rule of thumb for stocking any fish tank is one inch of fish per gallon of water in the aquarium. You can keep about 2-4 fish in a tank this size as long as each fish is not larger than 1 inch.
How do I know if my goldfish is happy? ›- Swim actively throughout the entire tank, not just hanging out or laying at the bottom, floating near the top or hiding behind plants and ornaments.
- Eat regularly and swim to the surface quickly at feeding time.
How often do goldfish need cleaning? ›
How often should a goldfish tank be cleaned? Once your goldfish tank is set up and fully cycled, you'll need to clean it once a week. As mentioned above, goldfish are dirty fish, and you must remove the mess they make to keep the tank environment clean and hygienic.
How long does it take for a fantail goldfish to reach full size? ›The average growth rate of a goldfish is about one inch per year. Baby goldfish grow very rapidly in their first few months. Then their growth rate slows as they get older. There are ways to make your goldfish grow faster, but remember: you should always aim to provide your fish with the best possible care.
What is the lifespan of a fantail? ›Fantails have a short lifespan of only 2-5 years, however they also have a rapid breeding cycle with an incubation period of only 14 days followed by another 13 days to fledging, with the potential to breed several times in a season.
What fish Cannot live with goldfish? ›Avoid aggressive fish that will pick on your goldfish.
In general, goldfish are peaceful animals that will not thrive with aggressive barbs, African cichlids, and other large cichlids.
When dissolved oxygen levels are low, fish hang at the surface and gasp, as the surface area has the highest oxygen level in the tank because it's in contact with the air.
Why is my goldfish floating but still alive? ›Positive buoyancy disorder, where the fish floats at the surface or on its side, is the most commonly presented form of swim bladder disease, especially in goldfish. Most likely, the cause is overinflation of the swim bladder. Overinflation usually takes place in the posterior chamber.
Why is my fantail goldfish laying on the bottom of the tank? ›Usually goldfish sit at the bottom of the tank due to not feeling well for some reason. Improper water conditions, parasites, stress, GI problems, and swim bladder problems can all cause a fish to sit at the bottom of the tank.
Can you mix fantail goldfish with normal goldfish? ›What Fish Can Live With Goldfish? Goldfish, on their own, require lots of space for proper keeping. Common goldfish, comets, and shubunkins cannot be kept with fancy goldfish. Additionally, some types of fancy goldfish, such as orandas, black moors, and fantails, shouldn't be kept with other fancy types like ranchus.
How do you keep fantail goldfish happy and healthy? ›- Get your goldfish a friend!
- Don't turn the lights on and off suddenly.
- Avoid banging the tank and making loud noises.
- Feed a variety of foods.
- Make the tank interesting.
As a general rule, you can keep two goldfish in a 20-gallon fish tank. The rule of thumb for fishkeeping states that you should allow one gallon of water per inch of fish. However, remember that goldfish can reach 8 inches in length and bigger, depending on the variety you're keeping.
What is the minimum tank for 1 goldfish? ›
Goldfish are active swimmers and need plenty of space to move around, so don't skimp on tank size to save money! A good rule of thumb is to choose a tank with at least 10 gallons of water for every goldfish. So, if you have two goldfish, you'll need a 20-gallon tank.
What is the easiest fish to take care of? ›Some of the easiest fish to take care of include white cloud minnows, cherry barbs, goldfish, guppies, neon tetras, and cory catfish. All of these species are relatively peaceful, non-demanding fish that do well in a beginning fish tank.
What is the minimum size tank for 1 goldfish? ›Appropriate aquarium size can be a point of contention among goldfish owners, but in general, we recommend 20 gallons of water volume per goldfish, with at least 10 gallons added for every other goldfish.
Do I need a bubbler for a 10 gallon tank? ›Bubbling devices aren't mandatory in planted tanks, but you still need some sort of mechanical process to oxygenate the water. Air stones are some of the most common aquarium elements that produce bubbles. There are also decorations that move and generate bubbles as long as they're connected to air pumps.
Do goldfish need a bubbler in a 10 gallon tank? ›You do not need a bubbler for your fish tank, though it is recommended, particularly if you do not have the time, energy, or desire to replace the tank's water frequently. Though not always a necessary addition, it certainly will not do any harm to introduce a bubbler into the aquatic environment.
Do goldfish need decorations? ›Goldfish tank decor is important
There are many great ways to care for your goldfish and, in our opinion, adding decorations to your tank is one of the best. Not only do decorations benefit your fish – helping to keep your goldfish happy – they also make the goldfish tank look nicer.
For example, even three common goldfish would need a tank size of 54 gallons (30 gallons + 12 gallons for the second fish + another 12 gallons for the third fish). Most people won't have a goldfish tank that size. If you want to keep lots of fish, we recommend choosing a smaller fish than goldfish!
How many goldfish can I put in a 100 gallon tank? ›We would recommend housing no more than 6 – 7 adult common goldfish in a tank this size however, as they still produce lots of waste, which can cause high ammonia, so strong filtration and regular water changes are still a must, even in a 100 gallon tank.
Do goldfish need a heater? ›In summary: Goldfish don't need heaters – most of the time. If the conditions of your home or outdoor environment get too cold for either fancy or common Goldfish, you may need a heater. Remember that Goldfish are endothermic, meaning their metabolism is controlled by the external environment.
Is tap water OK for goldfish? ›Goldfish cannot live in untreated tap water
Goldfish can only live in tap water when it has been properly treated to remove harmful chemicals. Tap water contains chemicals that will kill all of the 'good bacteria' in your tank.
Why are my goldfish dying one by one? ›
Unsuitable living conditions: For example, keeping your fish in a tank that is too small, or not using a filter. Poor water quality: There are lots of water parameters that you need to balance to keep your goldfish healthy. Overfeeding: Goldfish really don't need to eat much, and over-feeding can be very bad for them.
How do you entertain a goldfish? ›Goldfish need mental stimulation. Decorate the tank with colorful gravel, plants, a sunken ship, anything that will make the goldfish curious or provide an excellent hiding spot. Make sure the decorations don't have sharp edges, though.
How do you know if a goldfish has babies? ›- She has a bulge to one side of her abdomen: A goldfish carrying eggs will not be merely fat, but rather will have a chunky look to her. ...
- Other fish chase her: Males ready to fertilize eggs will pursue a female until she releases them.
Newborn baby goldfish start out black. As they grow, they develop a brown color, perhaps with hints of silver. Some areas of their body are almost see-through. It can take up to two years for a goldfish to fully develop its color.
How do you know if your goldfish is having babies? ›The female fish's swollen belly is the most obvious sign of pregnancy in goldfish. That's because she's carrying eggs inside her body. So, if one of your fish suddenly appears to have grown massively and is beginning to look fat, that's a pretty good indicator that she's pregnant rather than just greedy!
Should you flush dead goldfish down the toilet? ›It Could Damage Your Septic System or Plumbing
While your septic system and plumbing are designed for disposing of undesirable materials, dead fish are not on the list of flushable items. Septic systems are only meant to handle human waste, water and toilet paper.
Large water changes that include more than 60% water change, rinsing gravel, cleaning filter media lead to a complete, massive change in the water chemistry. Fishes when put in these new conditions, lead to temperature shock, stress, loss of appetite, and then death.
Can I leave my goldfish for 5 days? ›It's important to remember that goldfish are resilient and are more than capable of surviving without your care for days or even weeks. Whatever holiday food option you choose, don't worry about your fish. Relax and enjoy your holiday!
Can 1 goldfish live in a 1 gallon tank? ›One gallon isn't enough to provide them with the space and the processing capability that they require to process their waste, especially if they are heavy polluters like goldfish. Consider other aquatic life apart from fish for your one-gallon tank.
What does it mean when a fantail hangs around? ›In one Māori tradition, it was the fantail that caused Māui's death, so it is known as a harbinger of death when seen inside a house. A fidgety person is described as a fantail's tail, because of the bird's restless movements. “Ready for change? A part of you is ready to end and a new experience ready to come forth.”
What does it mean if a fantail keeps coming inside? ›
The Maori people consider the appearance of a Fantail to be associated with death. For instance, when a Fantail is seen inside a house it is considered to be bad luck and the news of death is imminent.
Can goldfish eat other dead goldfish? ›Goldfish by nature are not aggressive, and are not predatory. The short answer would be, "No, they don't eat each other".
How do goldfish sleep? ›Unlike people, goldfish do not lie down when they sleep. Rather, they become less active, staying in one place and moving slowly to keep themselves stable. They look like they are hovering in the tank or pond, usually low in the water, an inch or so off the bottom, with their heads pointed slightly downward.
Can you mix goldfish with other fish? ›Goldfish are generally not aggressive so they can be kept with most community fish provided the other fish are larger than the size of the goldfish's mouth.
Why do my fantail goldfish keep dying? ›Unsuitable living conditions: For example, keeping your fish in a tank that is too small, or not using a filter. Poor water quality: There are lots of water parameters that you need to balance to keep your goldfish healthy. Overfeeding: Goldfish really don't need to eat much, and over-feeding can be very bad for them.
Is it OK to touch a goldfish? ›It's advised to avoid touching or grabbing fish with bare hands in an aquarium unless in emergency situations. From sanitary concerns to fish safety, there are many reasons to avoid touching them altogether. Fish nets are best for proper handling, though nets can still lead to unnecessary stress on the fish.
Can a fantail goldfish live in a 20 gallon tank? ›A fantail fancy goldfish can grow to 8 inches in length, and a slim-bodied, Comet or Shubunkin can measure up to 2 feet long! Slim-bodied types are better off in a large garden pond, and fancies need a fish tank of at least 20 gallons.
Can goldfish live in a 10 gallon tank? ›Despite being social fish, goldfish are actually quite adaptable creatures. They can live in a wide range of environments, including small tanks. In fact, You can keep single goldfish in a 10-gallon tank or three to four baby goldfish if you intend to transfer them to a larger aquarium when they get bigger.
Should I change the water if a fish dies? ›You should do a water change after a fish dies in your tank, as this will help to minimize the risk of a spike in ammonia levels and other pollutants that can cause further harm to your fish.
Do goldfish recognize their owners? ›But beyond his glassy-eyed stare, your pet goldfish may have hidden depths. Oxford University scientists have shown for the first time that fish are capable of remembering and recognising human faces. They are also highly accurate at it – easily picking out a familiar face from up to 44 strange ones.
Do goldfish like to be alone? ›
Goldfish are a social species, living in shoals in the wild. In captivity, it's strongly recommended that they should be kept at least in pairs, to provide companionship. If you watch fish in a tank, you'll see that they regularly engage with other fish.
What size tank does 1 fantail goldfish need? ›Fantail goldfish can get reasonably large, but they're not powerful swimmers. Thus, they don't need an oversized tank to stay healthy. What is this? We recommend providing a tank size of 10 to 20 gallons per fish.
What is the longest living pet goldfish? ›How long do Common, Comet and Shubunkin goldfish live? Common goldfish, Comets and Shubunkins are the longest-living types of goldfish. They need more space than fancy goldfish, but given enough room in very large tank or pond, they can live for well over 10 years.
What if goldfish is too big for tank? ›If your fish is already too big for its current tank, you may want to consider a larger aquarium. Fish are adapted to their environments, and if they feel cramped in a small tank, this will inevitably lead to health problems. A larger aquarium will accommodate both existing fish and any new additions.