Koi cannot be mixed with tropical fish. Because Koi belongs to cold water fish, the water quality requirements of the two are different. Koi like to live in weak alkaline water, and feeding habits are more complex, in most cases is fed artificial feed. But most tropical fish prefer to live in slightly acidic water.
In addition, Koi requires a large living space. Generally, Koi should be kept in a fish pond or a large fish tank. If Koi is mixed with tropical fish, the water quality cannot be well controlled. Koi fish belong to high oxygen fish, eat a lot of food, excretion is also larger, it can be imagined that water pollution will be more serious. Therefore, Koi can not be mixed with tropical fish.
Koi and cold water fish mixed culture. The most common cold water fish are crucian carp and goldfish. Koi are larger and omnivorous. But goldfish are much smaller and clumsy, and if raised with koi, they are vulnerable to attack, injury or death. But brocade crucian carp can be raised together with brocade carp, because the color of both is the same, and the requirements for water quality, living environment and so on are basically the same. Therefore, Koi can be raised with cold water fish.
