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The rule of thumb for goldfish is 10 gallons per double tail fish (fancy goldfish) and 20 gallons per single tail goldfish. If your goldfish are overcrowded you can either, buy a second tank, return some of the fish to the petstore, or ask if anyone you know would like to have one of the fish.

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14y ago
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11y ago

Put them in separate tanks, that way they wont be able to hurt each other.

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12y ago

by a bigger one

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Q: What to do with goldfish which have outgrown their tank?
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Related questions

Will goldfish lay eggs in a fish blow?

Goldfish need to mature before they can lay eggs and they can get pretty large (6" or more). By the time they are large enough, they have outgrown a fish bowl. So technically, the answer is no. You will need large goldfish in a large tank before you can breed them.


Can fresh water mussels live in goldfish tank with goldfish in the tank?

Yes


What should you put in your goldfish tank?

It is important to remember to put things in a goldfish tank, even goldfish get bored. Some of my suggestions for tank decor are artificial plants and a "hidey hole" for your goldfish.


Can goldfish stay in the tank when platy fry are in?

You should not have goldfish and platies in the same tank ever.


Can four goldfish live in a ten gallon tank?

depends, can a ten gallon tank live in a goldfish


What is the benefit of breeding goldfish?

getting more goldfish in your tank


If your goldfish is about 2 and a half inches long how big does its tank need to be?

Regardless of the type or size of goldfish the minimum acceptable size of an aquarium for a goldfish is 30 gallons. Buy a tank that is at least 30 gallons if you plan to have goldfish. You can comfortably fit 3 goldfish in a tank this size but no goldfish in a tank any smaller. Goldfish are essentially pond fish and need lots of space to swim; they will not thrive in a small aquarium.


Can goldfish mate in 5 gal tank?

no. you should have 10gal of water per goldfish. you shouldn't have goldfish in a 5gal tank at all. they are huge waste producers


Do goldfish need to be kept in a tank?

Either a tank or pond of at least 30 gallons is a suitable environment for a goldfish.


Hi i have a 9 leter tank and 2 small goldfish do i need a filter?

Yes, goldfish are very messy. Goldfish need 10 gallons per fish, you actually need a 20 gallon tank or about a 70 liter tank for 2 goldfish. But the small tank will do while they are small, you will need to eventually get a larger tank.


Can you breed goldfish in a one gallon tank?

No. A one gallon tank is not appropriate for a singular goldfish much less multiple. A ten gallon tank is the bare minimum for a singular goldfish and breeding would require a tank of twenty gallons or more. A one gallon tank cannot handle the chasing that proceeds goldfish mating nor maintain a water quality that is suitable for raising goldfish fry.


What kind of cage or tank does a goldfish require?

glass tank