The rule is 1 inch per gallon. So if a fish is 2 inches then it gets 2 gallons, and so on. Also know that goldfish are extremely dirty fish and for a small 5 gallon tank it would be best to have only 1 or 2.
One goldfish needs at least 20 gallons, and then it's an additional 10 gallons per goldfish added after (so 30 gallons for 2 goldfish).This is not only because of the size that they can grow, which is big, but also because they are messy fish and produce a high amount of waste
It is recommended to have at least 20 gallons of water to house 2 goldfish.
Two goldfish typically require a minimum of 10 gallons of water to thrive.
1 goldfish. It may seem tiny now, but they grow up to be around 6 inches. Add 10 gallons for each additional goldfish. Example: 20 gallons + 2 more goldfish (10 gallons) = 40 gallons and 3 goldfish total.
Comet goldfish grow to be around a foot long. 120 liters is about 30 gallons so I say about 2. Get fancy goldfish because you could do even five in a tank that size because they don't get as big.
I would personally say none, not for their entire lives anyway. You may get away with 2 Fancy Goldfish juveniles for a couple of months, but really Fancy Goldfish need a minimum of 20 gallons each and Common/Comet Goldfish a minimum of 55 gallons each for their entire lives! They get very big, are very messy and need a lot of water volume!
Typically, it is recommended to start with one goldfish for every 20 gallons of water in a small aquarium. So, for a small aquarium of 10 gallons, you would need one goldfish to start.
Goldfish need plenty of room to swim around and get very large. In a 1000 gallon pond you could put 25-50 goldfish just keep in mind that goldfish grow very large and need about 20-30 gallons each when full grown.
It depends how big your bowl is if it is below 5 gallons then you should put one. But if it is 1 or 2 gallons then you will have to move it into a 5 gallon tank or bowl at the least.
None; that would work for one betta fish, but not a goldfish.One goldfish needs 20 gallons alone, plus 10 gallons per additional fish (so 30 gallons for 2 goldfish).It's not just about their size potential, but the fact that they produce a high amount of waste.
Fancy goldfish need at minimum 20 gallons for one fish, plus 10 gallons for each additional goldfish you are adding (thus 30 gallons for 2 goldfish); so the answer to your question is dependant on the size of your tank.
25