Ruby fish is not very suitable for polyculture. Because of their fierce personality, they are easy to attack other fish, and most of the time they can not live peacefully with other fish. They are also very territorial, and if other fish accidentally swim into their territory, they will chase and attack each other. It can easily hurt other fish. So they are more suitable for monoculture than polyculture.
Although ruby is not suitable for mixed culture, but it is not absolutely can not be raised with other fish. It can be mixed with more powerful fish, such as parrot fish. Parrot fish itself is a very territorial sense of the fish, as long as the two kinds of fish in their own territory, non-aggression, then they can coexist peacefully. The premise of polyculture is that two kinds of fish are about the same size, if one is very big, it may also bully the other.
Ruby fish and mini parrots can not be raised together. Because Ruby is more powerful, most of the time it will attack after the mini parrot. In severe cases, the tail of the miniature parrot will be chewed up within three days. Therefore, it is not recommended to breed ruby fish and mini parrot fish in the same tank, and it is better to breed them separately.
