Can goldfish and newts live in same tank?

1. Size Difference: Goldfish can reach sizes up to 10 inches, while most newt species remain relatively small, usually reaching a maximum length of 6 inches. The size difference can pose both physical and behavioral problems. Large goldfish can inadvertently injure or even consume smaller newts.

2. Diet: Goldfish are omnivorous and have a varied diet, including pellets, flakes, brine shrimp, and worms. Newts are carnivorous and primarily feed on insects, small invertebrates, and occasionally small fish. This difference in diet can create competition for food, and goldfish may consume any small animals introduced into the tank for the newt.

3. Water Requirements: Goldfish prefer water temperatures between 68°F and 74°F, with optimal water quality maintained by regular water changes. Newts can tolerate a wider range of water temperatures but are more sensitive to water quality fluctuations and prefer cooler temperatures, usually between 55°F and 70°F. Meeting the specific water requirements for both species in the same tank can be challenging.

4. Behavior and Temperament: Goldfish are active swimmers, often engaging in playful behavior. Newts are more solitary, preferring to hide or rest underwater for most of the day, only emerging to feed or for brief periods of activity. This difference in activity levels can stress newts and make it difficult for them to compete for food or survive in an environment with constant movement.

5. Potential for Disease Transmission: Goldfish and newts can carry different pathogens, bacteria, and parasites that may not affect their respective species but could be harmful to the other when introduced into their tank. Mixing species increases the risk of disease transmission and can have detrimental effects on both the goldfish and newts.

Therefore, it's not recommended to house goldfish and newts in the same aquarium due to these incompatibilities. Each species should be kept in separate tanks to ensure their well-being, health, and long-term survival.