What are the best tips for setting up and maintaining small goldfish aquariums?

To set up and maintain a small goldfish aquarium, follow these tips:

1. Choose a tank size of at least 20 gallons for a single goldfish.
2. Use a good filtration system to keep the water clean.
3. Maintain a consistent water temperature between 65-75F.
4. Feed your goldfish a balanced diet and avoid overfeeding.
5. Perform regular water changes to remove waste and maintain water quality.
6. Monitor water parameters like ammonia, nitrite, and nitrate levels.
7. Provide hiding spots and decorations for your goldfish to explore.
8. Keep an eye out for signs of illness and seek veterinary care if needed.