A fancy goldfish needs 20 gallons on it's own, plus 10 gallons each per additional fish (2 goldfish for 30 gallons, 3 in 40 gallons etc).
Fancy goldfish can grow quite large, and they are very high waste producers; anything less can shorten their lifespan and cause them harm from the toxins in the water.
You cannot put any goldfish in a 2 gallon tank.One fancy goldfish needs at minimum a 20 gallon tank on it's own. This is not just because of their adult size potential, but also because they are very messy fish and produce a high amount of waste.
You may want to add a liner to be on the safe side, but you could have 2 fancy goldfish, one one common or single tailed goldfish. (goldfish grow big and fast)
Since an oranda is classified as a fancy variety, you can put 4 Orandas on a 55 gallon tank.
If it is goldfish: 7 can fit. if it is mos other fish (besides koi) you can fit 14
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!
If they are fancy goldfish (the plump looking ones) then 6 or so would do well in an 80 gallon when fully grown if they are common goldfish, then 2 maybe 3 when full grown would be ok as they reach a whole foot long! This may seem like its not many fish for a large tank however goldfish are real poo machines and good filtration is a must.
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.
7....But you should keep an good watch on them.
it lays about 10,000 eggs at once
Two: There's commons and comets (Comets have longer fins). These are generally excluded from the "fancy" category. If you see a sign in your pet store labelling a non-fancy goldfish as "shubunkin", that's just the coloration. It's either a common goldfish, or a comet-tailed one.
20 gallons for one fish and 10 gallon for each addition goldfish. See the related link for further information.
None. Goldfish should have a minimum of ten gallons of water per fish if you wish for them to live out their full lifespan of ~20 years.