Here's why:
* Space: A bowl simply doesn't provide enough space for a goldfish to swim and grow. They need a minimum of 10 gallons of water per goldfish.
* Water Quality: Bowls are too small to house a proper filter, leading to a buildup of ammonia, nitrite, and nitrate. These toxins are harmful to goldfish and can lead to illness or death.
* Oxygen Levels: Goldfish require oxygenated water. A bowl doesn't have the surface area to allow for sufficient oxygen absorption.
* Temperature: Goldfish are sensitive to temperature fluctuations. Bowls are prone to rapid temperature changes, which can stress the fish.
To provide a healthy environment for a goldfish, you need:
* A tank: A minimum of 10 gallons per goldfish, with larger being better.
* Filtration: An appropriate filter system to keep the water clean and oxygenated.
* Water changes: Regular water changes (25-50% weekly) to remove toxins and replenish nutrients.
* Temperature control: Maintaining a stable temperature between 68-72 degrees Fahrenheit.
* Suitable substrate: Gravel or sand for the goldfish to explore.
* Plants and decorations: To provide enrichment and a sense of security.
Please don't keep a goldfish in a bowl. It is cruel and ultimately harmful to their health and well-being.