If a coelacanth dies of old age in a fish keeping tank, the problem is most likely due to the environment of the tank. The cochineal is a freshwater fish for temperate and subtropical regions. When breeding coelacanths, you need to pay attention to the following points:

1. Tank size: coelacanths need an appropriately sized living space, choose the tank size according to the number and size of the fish. If the tank is too small, the fish will feel crowded and uncomfortable.

2. Water quality: Cochineal fish have a low tolerance for water quality and need to change the water regularly to ensure that the water is clean and fresh. Otherwise, it will easily lead to water pollution, causing disease and death.

3. Food: It is necessary to provide coelacanth with proper nutrient balanced food, including fish food, insect food, water plants and other substances.

4. Water temperature: the coelacanth is suitable to live in the water temperature between 15-28 degrees, need to keep the water temperature constant, adaptability is not strong, if the water temperature changes too much will be harmful to the coelacanth health.

In summary, if the coelacanth dies in the fish tank, environmental and management factors should be analyzed comprehensively. Good keeping conditions include suitable water quality, food, water temperature and the right amount of swimming space. Only by comprehensively considering these conditions can we ensure the healthy growth of coelacanths.