Keeping Goldfish in a Fish Tank
Goldfish deserve real tanks too. A goldfish bowl is almost certainly an early death sentence for a fish that, properly cared for, could live 10 years or longer. Goldfish naturally grow to become 6 or even 12 inches long, so that cute little goldfish in that one gallon bowl is either not grown or has had its growth severely stunted.
While goldfish are very hardy and can survive in cold, unfiltered water, and cramped quarters, they are not happy or healthy. And small goldfish bowls aren’t really any easier to care for than a full size tank. The water so quickly becomes fouled in that small volume that you waste a lot of enjoyment time replacing water by hand.
Given a well set up tank and with only mild filtration, goldfish are generally hardier and easier to care for than tropical fish. They are able to thrive in lower water temperatures than tropical fish, and since a full-size tank will naturally change temperature more slowly than a tiny bowl, in typical homes it won’t need a heater.
Since goldfish come in so many beautiful and multicolored varieties, a full-size aquarium with only goldfish as occupants would be a handsome addition to any room, outdoing the color and attractiveness of any other kind of fish.