2. The Book of Changes points out: "Those who moisten everything cannot moisten water", and the fish tank in the living room can't live without water, so the fish tank is synonymous with "water" in Feng Shui. In addition to ornamental value, it also has the function of receiving qi to ward off evil spirits in geomantic omen. Fish and water coexist, which makes the room more lively and has a positive effect on home feng shui. So the taboo of bathtub is the taboo of water, and the two are similar.