Goldfish breeds vary greatly in size, body shape, fin configuration, and coloration. Various combinations of white, yellow, orange, red, brown, and black are known.
The ideal tank size for a pair of goldfish will vary depending on the type of goldfish, but lets consider both common and fancy goldfish in this discussion. Pair of Common Goldfish: For a pair of common goldfish, you should aim for at least a 55-gallon tank as the minimum requirement.
Goldfish Tank Setup Guide. Golden Angelfish Tank Size.Tank Mates For Goldfish. Gold Fish Tank Set Up.

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Tank Size Matters: Giving Them Space to Thrive. The size of the tank is arguably the most critical factor in determining the ultimate size of a common goldfish. A small tank restricts their movement, limits their ability to exercise, and contributes to poor water quality.

Do fish grow to the size of the tank? There is so much debate on this topic that I was hesitant to start it because of all the arguements and furniture throwing I know it will start. (there are some forums I won't put this on).