Pets Stack Exchange
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Questions tagged [goldfish]

Questions and issues regarding goldfish - one of the most popular aquarium fish.
Use with other relevant tags, such as feeding or health

The tag should be used for questions regarding goldfish, include any other relevant tags, such as health.
Goldfish is cold water fish, a member of carp family and has been selectively bred for over a thousand of years, currently having a few hundred recognized varieties. Somewhat commonly they are seen erroneously as an easy-maintenance pet requiring a only a small, filterless bowl - while in fact they need from about 38 to 80 liters of tank volume per one specimen, depending on the variety, to thrive and be able to reach it's full potential lifespan of over 10 years.

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Cooling a goldfish tank during summer

During the peak of last summer we had several goldfish that died after several days of hot weather and I suspect it was related. According to the Goldfish article on Wikipedia: Extremely high temperatures (over 30°C (86°F) can also harm…
PeterJ
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Is it true that goldfish growth is limited by container size?

As I grew up, I was taught that a goldfish will only grow to a certain point dependent upon the size of their container and how many fish are in the container; all the fish within the same container would be limited by this rule. Is it true that the…
user6796
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Goldfish unresponsive, what should I do?

I have a common goldfish that lives in a 20 gallon tank by herself with a filter and heater. Recently she has been showing signs of swim bladder disease because she wouldn’t swim properly. After feeding her peas, she would perk up right away. The…
Emma
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How to determine the gender of a goldfish?

How can I determine the sex of a goldfish? The only clues I heard so far were to wait for spawning season, or try to see the shape of the vents, but this get a little trickier if you´re not experienced with them.
woliveirajr
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Is my goldfish ok on his own in a pot pond?

I have three big outdoor pot ponds for goldfish. There were three living in a pot together for 2-3 years. I then moved the biggest fish into a separate pond pot by himself, as he was bumping at one of the smaller fishes when they were being fed. He…
user6796
8
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Goldfish coming to the top of bowl and releasing bubbles

I've recently got a pair of goldfish and put them in a bowl. I'm trying to keep them happy by feeding them all the natural thing they eat in the wild (and they are loving it too). It has been 4 ~ 5 days and things were going fine, until I got them a…
0x550x42
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Plants for dirty/algae ridden goldfish aquarium

I have a 20 gallon (70 liters) freshwater aquarium with two comets, which are now about 2 inches each. The aquarium gets dirty with algae covering the glass and all the plants very quickly after cleaning. This is nothing like the freshwater tank…
DaveO
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Do smaller numbers of goldfish form pairs?

I've been asking a lot of questions about goldfish, as I am preparing for a bigger pond. I currently have three comets that I will move to the bigger pond. The pond will be approx 350 L so there will be ample room for them. When the three fish were…
user6796
5
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1 answer

Could having fallen onto the floor have changed my goldfish's behavior?

I have a tank with three goldfish in it. Some weeks ago, I had to do a 100% water change and had to take the fishes out. While returning them to the tank, one of them, an Oranda, jumped off and hit the floor. There was no apparent injury and the…
help_for_goldfish
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Goldfish with white spot/fungal infection/something else?

Does anyone know what this is and how to treat it? One has a white lump near its eye, the other some white stuff at the end of its fan tail. Both are usually in a pond with others, but are currently quarantined in separate buckets.
Rob
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What is this lump on my goldfishes head?

I just noticed today that my goldfish has a lump on his head that is white around the edge with a red centre. He is eating and behaving normally. He is nine years old and has never had any other problems. The water quality is all came out fine when…
Katie
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Temperature Range for Fancy Goldfish

I have an aquarium housing moors and an oranda. What is a safe temperature range for these fish? There seems to be conflicting information on this online. My aquarium is in a conservatory and in the middle of winter the water temperature can get as…
Mitch
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My goldfish started growing a flower-like thing on his head and it is now disturbing it during eating

My pet goldfish, Mentos, has a flower-like structure growing on his head. At first, we didn't take it as a big issue. Now, it started concerning us and the fish itself because it blocks him from eating his food properly. He still does manage to eat…
Anarghya
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Dried goldfish became alive after re-introducing into water

Anecdote My relatives went on a trip leaving behind their goldfish. When they returned, they noticed that a fish had jumped out of the water and had become dry, apparently dead. But the fish was put back inside water again, and to my relatives'…
Megidd
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How can I get rid of a goldfish

A few weeks ago my wife rescued a goldfish from a public fountain. We put it in a fishtank lended by our neighbors then we installed a filter and some decorations. The thing is that : after a few days the kids lost interest, I'm not sure the tank…
Mathieu
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