Koi fish raises a few of the most auspicious and prosperous wealth (a few of koi fish's prosperous wealth are raised at home).

1. In Chinese traditional learning, taking nine as the supreme number to Yang has extremely noble implications. In geomantic omen, it is considered that raising nine koi fish, with a right star hanging on it, can make the family smooth, the family fortune smooth, and it is the most auspicious and lucky.

2. If the fish tank at home is not very big, it is also very good to keep a goldfish. In Feng Shui, keeping a fish has the saying of "a white water", which means prosperous wealth.

3. It's not bad to raise three fish. There is a saying that "three sheep bring prosperity to Thailand", which means auspicious and lucky. When choosing koi fish, it is better to choose red as the main color, which is fresh and bright, and makes people feel comfortable. It is necessary to avoid choosing koi fish with black spots, especially all-black fish. It is considered that all-black is too murderous compared with the home environment. Although it can resist the suffocation, it also kills wealth and happiness.