There really is no such thing as 'small' Koi! The smallest ones are around 16 inches full-grown, which is quite big for the average domestic fish. Sunburkins are often referred to as 'the poor man's Koi' and grow to about 15 inches long. They are a happy, active fish that get along with most other species of pond fish.
How big can small koi fish get?
What is the smallest a koi pond can be?
Minimum pond size for koi: 6ft x 8ft x 4ft is the smallest pond you should consider for koi Fish. This is due to the size and space they will require as they grow. You will need to consider the longterm size and growth rate of your fish when planning and building a pond for Koi Carp.
Will koi stay small in a small tank?
Unless your tank is over a thousand gallons (preferably a couple thousand gallons), koi should not be housed in a tank even if they are small as they grow incredibly quickly. The likely reason for their lethargy is poor water quality.
Can you have 1 koi fish in a tank?
There are a wide variety of opinions on tank sizes. The conservative rule of thumb is 10 gallons for every inch of fish. This means a single 12-inch koi would need 120 gallons! As you can see you will need a very large tank for just a few full-size koi.5 jul 2021