Koi is a famous Feng Shui fish. Since ancient times, Feng Shui masters have said that raising carp in the pond can hide the wind, attract energy and accumulate wealth. For example, three goats bring prosperity, five blessings come to the door, six and six are infinite, two dragons play in the water, good luck continues year after year, etc. In terms of numbers, 2, 3, 5, 6 and 9 are all auspicious numbers. It is okay to add 12 koi according to the auspicious numbers of each fish and add up to 12, for example, 9 red and white plus 3 gold, etc. If the fish tank or fish pond at home is big enough, you can raise more, but the density must be controlled well. You must know that the breeding density of more than 50 koi is 1-2 per square meter. It is not easy to raise 12 koi. thing.