Why is my blue betta fish turning red?

There are a few reasons why a blue betta fish may be turning red. One common reason is stress, which can cause bettas to change color. Another possibility is genetics, as some bettas have the ability to change color naturally. It is also possible that the betta is experiencing a health issue that is causing the change in color. If you are concerned about your betta fish's color change, it is recommended to consult with a veterinarian or a fish expert for further guidance.