In general, goldfish should be kept in a tank that is at least 20 gallons, and the larger the tank, the better. This will give them plenty of room to swim and grow, and it will also help to maintain good water quality. If you are keeping goldfish in a bowl, it is important to make sure that the bowl is large enough and that the water is changed frequently to keep it clean.
In addition to the size of the bowl, the shape of the bowl can also affect the growth of goldfish. Round bowls are not ideal for goldfish, as they can cause the fish to develop spinal problems. Rectangular tanks are a better choice, as they provide more swimming space and do not put stress on the fish's body.
Here are some additional tips for keeping goldfish healthy and happy:
* Feed them a high-quality diet
* Change the water in their tank regularly
* Keep the water temperature between 65 and 75 degrees Fahrenheit
* Provide them with hiding places
* Avoid overcrowding the tank
By following these tips, you can help your goldfish live a long and healthy life.