Before changing the water in the big fish tank, first put the water to be changed into a big basin, and then bask in the sun. The purpose of doing this is to remove chlorine, because the changed water uses tap water, and there will be residual chlorine in the disinfection process, which is harmful to the health of the fish, so it is necessary to let the chlorine volatilize by basking in the water. It usually takes 24 hours in summer and longer in other seasons.
Large fish tank water does not need to be changed too frequently, because the water quality is maintained well, usually once a week to two weeks can be changed, as long as the water can remain clear, do not need to change water frequently. The water volume of each water change is about one quarter to one third, because the water change is not frequent, so the water volume will be slightly larger, and it is useless to change less.
To change the water, you must first pump water. You can use a pump to pump water, or you can use a pipe to pump water from the bottom by siphoning, which can also bring out the dirt at the bottom of the water. After pumping out the water, the prepared new water can be slowly poured in from the tank wall, which will not cause water quality fluctuation and avoid the stress reaction of fish.
Pay attention to the water temperature when changing the water. If the temperature difference between the new water and the old water is too large, the fish may feel uncomfortable or even die directly. Generally, the temperature of new water can be 1-2 C higher than that of old water, and it is better to keep the same temperature before and after changing water.
