It's important to remember that:
* Euthanasia should only be performed by a qualified veterinarian. They have the knowledge and experience to ensure the animal's suffering is minimized.
* There are ethical considerations involved. Euthanasia is a serious decision and should only be made when all other options have been exhausted and the animal is suffering.
* There may be other options. A veterinarian can assess your betta's condition and offer alternatives such as treatment or placing the fish in a more suitable environment.
If you are concerned about your betta's health, please consult a veterinarian immediately. They can provide the best advice and care for your fish.