What will happen if you put a goldfish with betta fish?

* Different water conditions: Goldfish prefer cooler water temperatures (68-72°F) and tolerate higher pH levels than bettas, which thrive in warmer temperatures (78-82°F) and slightly acidic water.

* Aggressive behavior: While bettas are known for their aggressive nature towards other bettas, they can also be aggressive towards other fish, especially smaller or slower-moving ones like goldfish. This can lead to fin nipping, stress, and even injury or death for the goldfish.

* Feeding habits: Goldfish are omnivores and tend to eat more frequently than bettas, which are carnivores. This difference in feeding habits can lead to competition for food and potentially starvation for the betta.

* Waste production: Goldfish produce a lot of waste, which can quickly pollute the water and make it difficult for the betta to thrive.

Possible outcomes:

* The betta might attack the goldfish: The betta might see the goldfish as a rival or food source and attack it, potentially causing serious injury or death.

* The goldfish might be stressed: The constant threat of the betta, the unfamiliar water conditions, and the competition for food can cause the goldfish significant stress, impacting its health and lifespan.

* Water quality issues: The goldfish's waste can quickly pollute the water, making it difficult for both fish to thrive.

Alternatives:

* Separate tanks: The best option is to keep goldfish and bettas in separate tanks with appropriate water conditions and environments.

* Consider compatible tank mates: Research and choose other compatible fish species for both goldfish and betta tanks.

In conclusion, while it might be tempting to put a goldfish and betta fish together, it's not recommended due to the potential for aggression, stress, and water quality issues. Keeping them separate is the safest and most responsible choice for their well-being.