in the bottom filter fish tank? If you want to change the water in the bottom filter fish tank, you should first open the drain valve at the bottom, drain the old water inside, and then add water to the bottom tank. This kind of fish tank generally has a large volume, many fish are raised, and the filtering effect is very good, so there is no need to worry about the deterioration of water quality. It should be noted that it is precisely because of the large size, so the requirements for pumps are also very high, if the power is insufficient, it can not achieve the effect of maintaining water quality.
for changing water? 1. Water should be aired: The first step is to prepare the water to be changed in advance and air it for a period of time. Because tap water is used to change water, the water contains a small amount of residual chlorine, which may cause some harm to fish without drying. The time of drying is generally related to the season, if it is summer, one day is enough, two days in spring and autumn, and more than three days in winter.
2. Do not change too much: Although the new water can improve the water quality, it will also stimulate the fish and destroy the original ecological cycle. Therefore, you must not change too much water. On the one hand, you should not change the water frequently. It should be changed every three to five days at the soonest. On the other hand, you should control the amount of water. Each change of water should not exceed one third of the total amount of water.
3. Pay attention to the water temperature: The change of temperature will be very harmful to the fish, so the temperature should be consistent before and after the water change. Usually, before changing the water, the water temperature of the old water should be measured first, and then the new water should be prepared according to the water temperature. The difference between the two temperatures should not exceed 2 degrees Celsius, so that the water temperature will not fluctuate greatly.
