a 40cm tank is relatively small. Generally, it can only raise some small fish of less than 5cm, and you can raise about 15. If you raise a medium-sized fish of 5-10cm, you can raise 5. A big fish cannot be raised. In such a narrow environment, you often cannot turn around. Fish farming must control the breeding density, because the oxygen in the water is limited, if there are too many fish, and there is no other means of oxygenation, it is easy to lead to hypoxia.
1. Consistent size: The first rule for fish tank mixed culture is that the size should be consistent, because in the world of fish, it is natural for big fish to eat small fish. There is no fish that is absolutely vegetarian. Even grass carp will eat fish and insects. If there is a big difference in the shape of the fish in mixed culture, the small fish will become the food of the big fish sooner or later.
2. The fish tank is spacious: The mixed culture must provide sufficient environment, so a spacious fish tank is needed. Because many fish have territorial consciousness, if the fish tank is too small, the fish will inevitably reach other people's territory when swimming, so they will be chased and bitten, if the fish tank is spacious, at least they can escape when bitten.
3. Adequate feeding: If you want to ensure that there is no fight between the fish, you must feed them enough. It is easy to bite each other if they are not full. In addition, if a fish becomes a tank bully, we must pay attention to it, otherwise it will lead to some fish can not eat anything. If the fish are sick, they should be isolated in time.
