The Best Fishes for a Fishbowl Without an Oxygen Pump

Keeping fish in a bowl without an oxygen pump can be challenging due to limited water volume and surface area for gas exchange. However, some fish are more tolerant of these conditions than others. Here are some of the best options:

1. Betta Fish (Betta splendens)

Care Level: Easy Temperature: 76-82°F or 24-28°C Notes: Bettas have a labyrinth organ that allows them to breathe air from the surface. They can thrive in smaller spaces, but clean water is essential. Regular water changes are crucial to maintain their health.

2. Goldfish (Carassius auratus)

Care Level: Moderate Temperature: 65-75°F or 18-24°C Notes: Small goldfish can survive in a bowl, but they produce a lot of waste. Regular water changes and filtration are necessary to keep the water clean. Be mindful of the water quality and temperature as they can affect the goldfish's well-being.

3. Guppies (Poecilia reticulata)

Care Level: Easy Temperature: 72-82°F or 22-28°C Notes: Guppies are hardy and adapt well to various conditions. They reproduce easily, so be mindful of their population. Regular water changes and monitored breeding practices are crucial to prevent overcrowding.

4. Endlers Livebearers (Poecilia wingei)

Care Level: Easy Temperature: 70-80°F or 21-27°C Notes: Similar to guppies but smaller and less aggressive. They thrive in small groups, making them a good choice for a fishbowl. Proper monitoring and care are still necessary to ensure their well-being.

5. Shrimp (e.g., Cherry Shrimp)

Care Level: Easy Temperature: 70-78°F or 21-26°C Notes: While not fish, shrimp can be a great addition to a bowl. They help keep the tank clean and require less oxygen. They are easy to care for and can enhance the aesthetics of the bowl.

Tips for Keeping Fish in a Bowl

Water Changes: Perform regular water changes, at least 25% weekly, to maintain water quality. Consistency is key. Filtration: Consider using a small sponge filter if possible. This can help with biological filtration without much water disturbance. Plants: Live plants can help oxygenate the water and provide hiding spots for the fish. They also enhance the look of the bowl. Avoid Overcrowding: Keep the number of fish to a minimum to reduce waste and stress. Overcrowding can lead to poor water quality and stressful conditions for the fish.

While it is possible to keep fish in a bowl, it is generally better to provide a proper aquarium setup with filtration for the health and well-being of the fish. A cycled filtered tank that is big enough to provide a healthy amount of swimming area is essential for the fish's health. Anything smaller than 5 gallons is too prone to parameter swings to be healthy for any fish, regardless of how small the fish is. And even a betta deserves room to swim.

Final Thoughts

Tanks should have more lateral swimming area than height, as fish swim laterally, not vertically. Lateral area assists with oxygen exchange. Focus on the needs of the fish rather than the aesthetic appeal of the fishbowl. Consider getting a plant to enhance both aesthetics and the functionality of the bowl.

In conclusion, while there are fish that can survive in a fishbowl without an oxygen pump, it is important to prioritize their well-being and provide them with a suitable environment that mimics the conditions of a larger aquarium.