Why is my betta fish dying and what can I do to save it?

There are several reasons why a betta fish may be dying, including poor water quality, improper diet, or stress. To save your betta fish, you should ensure that its tank is clean and properly maintained, feed it a balanced diet, and create a stress-free environment with appropriate water temperature and decorations. Consulting a veterinarian or a knowledgeable fish expert may also be helpful in determining the specific cause of your betta fish's illness and finding the best course of action to save it.