Betas, commonly known as betta fish or Siamese fighting fish, should not be kept in a small glass jar as a permanent habitat. While betas are known for their ability to breathe air at the water’s surface and their hardiness, they still require proper care and living conditions to thrive.

Here are some reasons why a small glass jar is not suitable for bettas:

1. Lack of space: Betta fish need space to swim and explore. Keeping them in a small jar limits their mobility and can lead to stress and health problems.
2. Water quality: Maintaining water quality is crucial for bettas. In a small jar, it’s challenging to maintain stable water parameters, such as temperature, pH, and ammonia levels, which can negatively impact the fish’s health.
3. Lack of filtration: Small jars typically lack filtration systems, which are essential for removing waste and maintaining water quality. Without filtration, ammonia levels can quickly rise to toxic levels.
4. Limited oxygen exchange: While bettas can breathe air from the surface, they still require adequate oxygen levels in the water. Small jars may not provide sufficient surface area for oxygen exchange, leading to oxygen depletion.
5. Temperature fluctuations: Small containers can experience rapid temperature changes, which can stress and harm bettas. Bettas prefer a stable water temperature in the range of 76-82°F (24-28°C).
6. Psychological well-being: Bettas are curious and intelligent fish. They need stimulation and enrichment, which a small jar cannot provide. Inadequate space can lead to boredom and behavioral issues.

To provide proper care for a betta fish, it is recommended to keep them in a tank or aquarium that is at least 5 gallons in size, provide filtration, maintain stable water conditions, and offer appropriate hiding spots and decorations for enrichment. This will help ensure the health and well-being of your betta. Small jars or bowls are not suitable long-term homes for these fish.