Betta fish are aggressive fish in nature, so it is generally not recommended to mix. There are many people who raise betta fish after polyculture, and they will find that if they are polyculture of the same kind, they will fight to the death. If they are not polyculture of the same kind, there will be no fighting, mainly because betta fish are generally only fierce to the same kind.

Although fighting fish are very aggressive, they are relatively small in size, so their combat effectiveness is very limited, which is not as fierce as ordinary tropical fish. Therefore, if they are mixed with other fish, they will be very nervous and dare not fight easily to grab food, which will lead to their failure to eat food in many cases.

When raising betta fish, many people feel that raising betta fish alone. Although it avoids fighting betta fish, it also makes betta fish look lonely, so they especially want to raise more fish. Because of the aggressive nature of betta fish, if it is necessary to carry out polyculture, it is necessary to choose a good polyculture fish. Fish with high swimming speed, such as moonfish and swordfish, can be mixed with fighting fish, and fish that only move at the bottom of fish tank can also be mixed with fighting fish. These mixed fish can't be bigger than betta fish, and ordinary tropical fish can't be selected, otherwise betta fish will feel unsafe and even lose their aggressiveness.