Yes! Goldfish do need a big tank – you should never keep goldfish in a bowl!
If you’ve got a goldfish in a bowl, we suggest checking out our ebook, which will tell you what you need to do as soon as possible.
How long do goldfish live in a fishbowl?
Goldfish in a fishbowl won’t live for very long at all, unfortunately. There are some rare exceptions, but most goldfish kept in a bowl will be dead within weeks.
Why do goldfish need a big tank? It’s important to realize that the goldfish you buy in your local pet shop are very young and have not reached their full adult size.
You might be surprised to know that common goldfish can reach up to 10″ and fancy goldfish can reach up to 8″, so you definitely need a big tank for them!
What size tank do I need for two goldfish?
For two fancy goldfish, we recommend 30 gallons. For two common goldfish, we recommend 42 gallons.
Recommended goldfish tank sizes:
Fancy goldfish: 3 feet long and a volume of at least 20 gallons for one goldfish. If you plan to keep more than one goldfish in your tank then add an extra 10 gallons for each additional fish.
Common goldfish: 4 feet long and a volume of at least 30 gallons. If you plan to keep more than one goldfish in your tank then add an extra 12 gallons for each additional fish.
Goldfish with other fish: It is possible for other fish to live with goldfish, but you will need to make sure your tank is big enough, not just your goldfish, but for their tank mates too.
It’s worth noting that common goldfish are often more suited to a pond once they grow larger in order to ensure that they have enough room to swim around. Very few people have an indoor aquarium large enough to properly keep a fully grown goldfish!
Finally, don’t forget that your goldfish tank needs a filter!
Even a big tank will get polluted very quickly if it isn’t properly filtered or if you don’t do enough water changes. If possible, get an external filter, as they have a larger volume than internal filters, and sit outside your tank so that they don’t take up valuable space inside your aquarium.