Grass gold is the best variety of cold water fish to raise. It is not big and can survive in a muddy environment. However, in order to raise it well, it is best to provide good filtration. At the same time, water should be changed regularly to keep the water clear. There is nothing wrong with keeping this kind of fish in schools, but if you keep too many fish, you need to add oxygen to the tank.
Koi carp is a fish of the genus Cyprinus of the family Cyprinidae. It is actually the same species as the edible carp, but after generations of improvement, it has become varied and has a variety of colors. However, it still retains many characteristics of carp, so it is relatively easy to raise. It should be noted that because of its large size, the consumption of oxygen is relatively high, generally requiring regular oxygen.
Medaka is a small freshwater ornamental fish. Compared with many small tropical fish, its greatest advantage is that it can be raised very well without filtration and oxygen, and it does not need a particularly large living environment. Its feeding habits are relatively complex, can tolerate salt and hypoxia, has no requirement for PH, and has a wide range of water temperature adaptation.
Chinese fighting fish are mainly distributed in the south of the Yangtze River in China. They are 5-6 cm long and aggressive by nature, so they can only be raised alone. It is worth mentioning that it is a fish of the Silkfoot Perch family, which has auxiliary respiratory organs, so in the water with low dissolved oxygen, it can also swim to the surface to breathe air.
