Koi fish can cost anywhere from $10 to $20,000. It depends on their size, shape, and coloring. Koi can grow to over 3 feet long. The favored shape is torpedo-like. Koi are easy to keep, and an aquarium takes up little space. Koi adapt to their environment and grow according to their space. So they will not outgrow the aquarium nor jump out. Koi are also strong.
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