Read on to find out why. Well THAT makes things easy, right So you can see that there are all kinds of ideas floating around out there on exactly how many gallons of water a fancy or a slim-bodied fish needs… … And precious little evidence to show why one is superior to the others. No wonder people are confused about goldfish tank size! The problem? None of them take into account that you might be able to have lots of plants, more water changes , carefully regulated feeding, or greater filtration capacities — things which can really offset having a smaller water volume.
Every situation can vary drastically. Not me. See… Goldfish produce a growth-inhibiting hormone GIH that builds up in the water. When that water is changed all the time, the hormone is removed and the fish continues to grow. A bigger tank helps to dilute this hormone, which is why goldfish tend to get really big in a big tank. Now: In a bowl or small tank, that hormone is very concentrated unless lots of water changes are done all the time.
And this is not the bad thing a lot of people think it is. That said: Even some full-grown adult goldfish will never get to be monsters with tons of space, clean water, nutrition, and time. These can be genetically stunted and can also do quite well in a smaller space. Think of it this way. You could get a puppy and lock it up in a small kennel.
Feed it twice a day and never let it out of the kennel again. The dog would likely live for years, but it would be a sad and stunted creature. The goldfish or puppy in our example can certainly survive for a time in a small and dirty environment. For the animal to truly thrive, it needs much better conditions. The puppy needs to run and play and get sunshine. The goldfish needs room to swim and clean water to live in. Goldfish are extremely hardy creatures.
Even subjected to stress, cramped quarters, and filthy water, they still manage to muddle along. This is a testament to the fish, not the fishkeeper. The way I see it: A small, healthy fish is just as legitimate as a big healthy one. Successful goldfish keepers have kept fish for decades in a variety of containers supplied with good water quality. Some of the oldest is a couple of commons in a 10 gallon 37 liters tank won as a prize from a fair.
A full-grown fancy or slim-bodied goldfish carassius auratus can measure anywhere between 4. General recommendations or rules of thumb for a set number of gallons per fish vary widely from source to source. But so many contradicting rules have been created! And few — if any — are substantiated by any scientific fact. Because water volume does NOT have a direct influence on the health of your goldfish provided the fish can swim around enough to prevent muscle atrophy.
Is it possible to keep two small Goldfish in a 2. Ask Question. Asked 6 years, 9 months ago. Active 1 year, 6 months ago. Viewed 35k times. Improve this question. Voitcus 2 2 silver badges 7 7 bronze badges. U can't put any fish here, maybe snails or shrimp, but not a fish and ofc goldfish is the worst option. Add a comment. Active Oldest Votes. Improve this answer. Jestep Jestep 3, 11 11 silver badges 14 14 bronze badges. Can you add references? Here's one: tfhmagazine. You should include the reference in the answer as comments get deleted.
AND that reference does not support your quote of 30 gallons per fish. The article states 55 gallons minimum, but preferably a pond. Since comets can get larger than 12 inches and several pounds, even a 30 is likely insufficient for an adult.
However, 20 - 40 gallons is a generally suggested range that I've seen over the past 25 years of keeping fish. Personally I don't think they should be kept in anything but a pond.
There's unlikely to be any scientifically relevant study on appropriate tank size so any reference is going to be subjective, which is why I didn't specifically include one. There is a number that specifically support the 20 to 40 range if needed. This tank is also too small for a betta, i would not recommend that out of respect for the betta.
No aquarium fish should live in a 2. Even for shrimps it would be too hard to maintain the water quality and temperature. A betta might survive in this but it will not be comfortable and will die young. A tank of this size cannot maintain stable chemistry. I downvoted because this is perpetuating a harmful myth about how bettas can live in small bowls. Both betta and goldfish are though enough to survive bad water, both deserve better. Show 2 more comments. Jestep has a good answer, but sometime it helps to be able to visualize things.
Spidercat Spidercat Here is one: Fish Calculator That's just the oxygen. Dalton Dalton 4, 13 13 silver badges 34 34 bronze badges. For example: Betta or Ramirezi are extremely territorial with other fishes.
I do not have experience with golden fish, so I cannot help there. However, you also state: Their water looks cloudy, and they keep going to the surface for air. This means that the aquarium is not properly set, and you do not have much experience. The most important device that you need is the mechanical filter.
The most important activity at the beginning: cycle the aquarium. Charity J Charity J 1. Featured on Meta. Now live: A fully responsive profile. Linked 0.
Related 2. Hot Network Questions. Question feed. Pets Stack Exchange works best with JavaScript enabled. Accept all cookies Customize settings. But with time when it will grow, you need to shift it into a larger tank. These tanks are not recommended for long term use.
One inch of fish per one gallon is the general rule used to determine the tank size or the number of goldfish to be kept in a tank of a particular size.
As per this rule of thumb, two to four small goldfishes can be kept in a gallon tank. It should be remembered that goldfishes grow quicker than other fishes. But they will not get matured and be of proper size unless they are kept in a larger tank.
However, if you follow this rule, you have to keep a record of the sizes of the goldfishes regularly. Common goldfish can easily grow up to 10 inches and fancy goldfish usually reach 8 inches in length. Some goldfish have grown even bigger. Some fish hobbyists recommend putting a single goldfish in a gallon tank so that it can grow up in a proper environment. So it is better to keep them in a larger tank from the beginning to avoid overload of fish waste, less room for the fish, stress on the fish, polluted water, disease, and death.
Usually, tanks smaller than 10 gallons are not used for goldfish due to lack of inadequate room for the fish. The answer to this question is somewhat tricky. Two common goldfish can be kept in a gallon tank. But two fancy goldfish cannot be kept in a gallon tank as they require more space.
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