What happened when the fish in the fish tank died?

Such problems should not be associated with Feng Shui and the Book of Changes. Generally, families can basically master fish farming, feeding and changing water, so the probability of problems in this area is extremely small. The biggest probability of problems is that indoor smoking cannot be eliminated in time, and the smoke dissolves in water, leading to fish poisoning and death. It is also possible that the child put something or substance (such as a smoked cigarette butt) into the fish tank. It may also be caused by indoor air quality problems. No matter what kind of problem it is, it is enough to attract the attention of the owner-it may cause physical discomfort or pathological changes.