Betta cubes are small aquariums designed to house betta fish. They come in a variety of sizes, ranging from 1 gallon to 5 gallons. The larger tanks tend to provide more space for the betta; however, they also require more water changes and maintenance. Smaller tanks are easier to maintain as they do not need frequent water changes and can be kept on a smaller budget. When selecting the right size tank for your betta, consider factors such as the number of fish you want to keep and whether or not you plan on adding any decorations that will take up additional space in the tank. Make sure that your tank is large enough so that there is plenty of swimming room for your betta but also small enough so that it doesn’t become too crowded with decorations or other fish species.