The number of in a fish tank is usually related to the size of the fish tank and the size of the fish. For example, a fish tank of 1.5 meters can hold 150 small fish less than 5 centimeters, more than 30 fish of 5-10 centimeters, or 15 fish of 10-20 centimeters, and only 3 fish of half a meter. Because of the large number or size of fish, the demand for oxygen is large, the dissolved oxygen in the fish tank is limited, no matter how oxygenation will not break through the upper limit, so the number must be controlled.
? 1. Guppy: Guppy is a small ornamental fish with a length of about 3-4 centimeters. It has many varieties and rich colors. This kind of fish has strong adaptability to the environment, can tolerate dirty water, and has the characteristics of clustering, so it is very suitable for group breeding and looks beautiful.
2. Lantern fish: Lantern fish is native to the Amazon River Basin in South America. It is petite and docile. In the wild, in order to resist the attack of other fish species, it will choose group activities and has the characteristics of group swimming. It has many varieties, such as head and tail lights, red tail glass, lotus lanterns, traffic lights, black skirts and so on.
3. Zebrafish: Zebrafish has a spindle-shaped body with many blue vertical stripes, which looks similar to zebras. This kind of fish has a lively temperament, and as a tropical fish, it is not afraid of cold. It has a mild temperament, likes to swim in groups, and feeds mostly on animal feed.
