Best tank size for my goldfish?

If I were you i would just keep the goldfish in the goldfish bowl;Goldfish will only get as big as there environment will let them. so unless you want a giant gold fish,AKA Carp,keep him in a gold fish bowl. Bonus answer, never mix goldfish with Tropical fish! Goldfish emit oils that can be toxic to some tropical fish. They never do very well together.

For just the one, 20 gallons would do. If you want more, add 10 gallons for each fancy goldfish. Since you said that price doesn't matter, just go to petsmart and buy maybe a 55 gallon tank and you could have like 5 or 6 fancy goldfish in it. Make sure you get a good filter, rated for a tank twice as big or buy two rated for the size your tank is (that's what I'd do).

At least a 20 gal. but of course bigger is better, especially if you want more fish.

I suggest you go to a decent pet shop and look for a big plain glass tank, probably wont even have a

brand name", and a good power filter to match. That's the important things, the rest is "window dressing".

It's easy to spend a lot of money on a small gimmicky 15 gal tank, where for the same dollars you can probably set up a simple 50 gal, with a GOOD filter, and have space for 3 or 4 fish

Ian

Fancy goldfish requires minimal 20 gallon for the first one, and 30 gallon for just two.

Common goldfish requires minimal 40 gallon for the first one, and 55 gallon for just two.

Yes, tank is is very important to the well being of the fish. :)

You NEED at least 30 gallons but she will outgrow that most likely, i would try a 40 gallon. With that you could add 1 or 2 friends for her. Make sure you have the proper filter!

First of all no fish deserves to live in a fish bowl that's like a human living in a closer . What size is she? I'm gonna estimate 3 in? I would put it in a 20 g tank goldfish are really messy and dirty .

I'd say a fantail needs at least 30 gallons, since they get a little larger than other fancies.