Native to China, the goldfish is a relatively small member of the genus Carassius (which also includes the Prussian carp and the crucian carp). It was first selectively bred for color in imperial China more than 1,000 years ago, where several distinct breeds were developed.
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Thus, the smaller your goldfishs tank, the more often you will need to change the water and clean the tank to maintain a pristine tank environment. How many ranchu in a 40 gallon tank? The answer is the same: about three or four ranchus.
