Mary fish is more suitable for weakly alkaline hard water, because the water from which they originate is weakly alkaline. The breeder can control the PH value between 7.2 and 7.4 and keep it stable. Mary fish like to live in clean and clear water, and breeders need to change their water regularly. If the breeder does not install a filter, it will take about 3 days to change the water for them.

If the breeder has installed a filter, it only takes 5-7 days to change the water. Although Mary fish have strong adaptability to the environment, they are sensitive to the fluctuation of water quality, so breeders need to pay attention to the amount of water change. Under normal circumstances, the amount of water changed each time can be controlled at one third of the total amount of water. After feeding them every time, it is best to clean up the food residue and feces in the fish tank to slow down the deterioration of water quality.

Mary fish does not require high water temperature, and they can grow in the water temperature between 18-28 ℃. Although they can accept a wide range of temperatures, it is not recommended to grow them in low temperature environment for a long time. This will reduce their resistance and immunity, and eventually lead to death. If breeders want them to grow better, it is best to install a heating rod to keep the water temperature between 22-28 ℃. In this temperature range, Mary fish has the best appetite and activity, and its growth speed is also the fastest.