It is best to control the water depth of raising goldfish at about 10-50 cm, but the specific water level is still determined according to their size and species. Some goldfish varieties are suitable for living in shallow water, such as butterfly tail goldfish, lion head goldfish, tiger head goldfish, etc. It is most appropriate to control the water depth between 10-30 cm.

There are also some goldfish suitable for living in deep water, such as Ryukyu goldfish and Thai lion goldfish, which need to control the water depth between 40-50 cm. In addition, adult goldfish, it is best to control the water level above 30 cm, so that their activity space can be more comfortable.

The suitable water temperature for goldfish is between 0-38 ℃, and their requirements for temperature are not high, and their adaptability is relatively strong. As long as the water temperature remains constant, they can grow normally. However, the most suitable water temperature for goldfish growth is between 18-23 ℃. If the breeder has the conditions, it is best to keep the temperature within this temperature range. Because the water temperature is too low, their appetite and activity will decrease, and their growth speed will slow down. If the water temperature is too high, they will also cause discomfort and affect normal growth and development. To make goldfish grow better, breeders can install a heating rod to keep the water temperature in a stable range.