To raise guppies, we should first pay attention to the breeding density. A 40*25*30 fish tank can raise 50-60 fish species. Too high or too low density is not conducive to growth. At the same time, pay attention to the water temperature, control the water quality, and keep the hardness between 10 ~ 15. Shrimp seedlings are mainly fed daily, with rich nutrition and easy absorption. In addition, there are many fish that can be matched with it, such as moonlight fish, traffic light fish, zebra fish and so on.