Your Betta supplies must have one additional standard part you will possibly not think that they require. This would be an aquarium heater. Betta fish are tropical fish and prefer to live in warmer water. Keeping them in cold water can actually shorten their life. Your Betta likes a water temperature of 74 to 78 degrees Fahrenheit. In order to maintain the temperature inside of that range, you will require an aquarium heater. Aquarium heaters can be found in different sizes so be sure to find one that is the right size for the tank you are keeping your Betta fish in. Once again, this will make owning a Betta even easier.