What is the relationship between koi fish and Feng Shui?

Koi fish has the function of flourishing geomantic omen, and is known as the King of Geomantic Fish. As early as in ancient China, many dignitaries raised koi fish's prosperous geomantic omen. More is based on the owner's life, keeping fish safe and seeking wealth. According to the books I have read, I think some of them are quite incisive. Let me share it with you for reference only. Generally, people who raise fish for wealth at home can raise three koi fish, two red and one black. If it is used for other purposes, it is better to raise odd numbers, and it is better to raise fish with more than three colors together. Don't put the fish tank under the beam as the cabinet wall (according to the pulse of the room), and don't put it under the stairs, in the kitchen or in the bedroom.