can change water every 3-4 days, but the specific frequency of changing water depends on the actual situation of the breeder. If the number of goldfish raised in the fish tank is large, the frequency of water change should be higher, and the water should be changed every 2-3 days. If the number of goldfish in the fish tank is normal or small, the water can be changed every 7 days. If there is no filtration system in the fish tank, it is better for the breeder to decide the frequency of water change according to the water quality, which normally takes about three days. If there is a filtration system in the fish tank, the frequency of water change can be reduced, about 10 days can be changed, if the water in the fish tank is not too muddy, it can also be changed about 15 days.
1, groundwater: raising goldfish can choose groundwater, because groundwater contains a lot of minerals, long-term use of groundwater to raise goldfish, can make their body more healthy.
2, tap water: Tap water is more convenient, but also the first choice of many breeders, but the use of tap water to raise goldfish needs to be exposed to the sun first. Because tap water contains chlorine, although it is not harmful to human body, it is very harmful to goldfish, so breeders need to be exposed to the sun for 1-2 days before using it.
