The interval between goldfish changing water is usually related to the season. The higher the temperature, the faster the water deteriorates. Therefore, change water more frequently. In spring and summer, it is usually changed every 10 days, and in winter, as the temperature drops, the water quality is not so bad, it can be extended to 15 days. It should be noted that water exchange in winter is usually carried out at noon, when the temperature is slightly higher, it is not easy for fish to freeze.
Tap water is usually used to change water for goldfish, but this kind of water cannot be changed directly. It contains certain chloride ions, which are harmful to the health of the fish, and there are certain differences in water temperature. Generally, 1-2 days before preparing to change water, it is necessary to put the connected tap water in a sunny place to maintain good air circulation, which can accelerate the evaporation of chlorine and increase the dissolved oxygen.
When changing the water can not be completely changed, each time to retain an appropriate amount of old water, if all the new water, easy to stimulate the fish, leading to their death. If you can fish out the excrement in the fish tank, then change one tenth of the water is enough, if there is no way to salvage, then change one third of the water, so as to ensure the clean water quality.
When filling new water into the fish tank, you can't pour it all directly from the top. It is necessary to pour new water slowly along the wall of the tank, so as to avoid cold water washing into the fish body, causing it to catch cold and get sick, affecting its growth.
