* Social animals: Goldfish are social creatures and thrive in groups. They are less likely to get lonely and exhibit stress behaviors like hiding or fin-nipping if they have companions.
* Mental stimulation: Having other goldfish to interact with provides mental stimulation and keeps them active.
* Natural behavior: In the wild, goldfish live in schools, which helps them survive and avoid predators.
* Tank size: Goldfish can grow quite large, and keeping multiple goldfish in a larger tank allows them more space and helps maintain better water quality.
However, there are some exceptions:
* Small goldfish: If you are keeping a very small variety of goldfish, like a single-tailed goldfish, they may be okay alone in a properly sized tank. However, it's still best to consult with an expert.
* Limited space: If you have limited space and can only comfortably house one goldfish, it's better to have just one than to overcrowd a small tank.
Important considerations:
* Tank size: The tank size should be large enough to accommodate the number of goldfish you have. A good rule of thumb is 10 gallons per goldfish.
* Water quality: Maintaining good water quality is essential for the health of your goldfish. You will need a filter and regular water changes.
Ultimately, it's best to research the specific species of goldfish you are interested in and consult with a knowledgeable aquarist or veterinarian for recommendations.