Betta fish and goldfish are not suitable for being kept together in the same tank. Betta fish are well-known for their aggressive nature, especially male betta fish, which have a strong sense of territoriality and are highly aggressive. They will engage in fights with other fish. In particular, when facing smaller and more docile fish species, such as grass goldfish, betta fish may launch attacks, causing other fish to get injured or even die. Moreover, the requirements of betta fish for water quality and water temperature may differ from those of other fish, which also increases the difficulty and risk of keeping them together in a mixed tank.
The Habits and Aggressiveness of Betta Fish
Betta fish have a strong sense of territoriality and aggressiveness, especially male betta fish. They will fight with other fish over resources such as territory and mates. Even when there is no direct attack, the presence of betta fish can make other fish feel stressed. Over time, this will have an impact on the health of other fish.
The Habits of Goldfish and Their Compatibility with Betta Fish
Goldfish are relatively docile and swim at a slower speed. If betta fish and goldfish are kept together, betta fish may attack the goldfish, leading to injuries or even the death of the goldfish. In addition, goldfish are suitable for living in groups, while betta fish are more suitable for living alone. These differences in habits also make it inappropriate to keep them together in a mixed tank.