The interval of water change is usually not fixed, which is mainly related to the size of the tank, the number of fish and the ability to filter.If the fish tank is relatively large, there are not many fish, or the filtration system is good, there is no need to change the water frequently, and it is no problem to change it once every half month.On the contrary, if the water quality deteriorates quickly, change the water frequently, once a week or three or four days.
The amount of water changed is at least one fifth, and at most one third. Any more will stimulate the fish, thus causing a stress reaction.Usually change water frequently, each time do not need to change too much, change water frequently, naturally change a little more, so as to maintain good water quality.
When changing the water in the fish tank, you need to pump out the water at the bottom with a water pipe first, so as to drain the residual bait and dirt.Then the prepared new water is slowly poured in from the tank wall, which will not cause the water body to be motionless, avoid the stimulation of fish, and at the same time keep the temperature change not too big.
Tap water is usually used to change the water in the fish tank. Because the water contains residual chlorine, it cannot be used directly after receiving the water. It is best to put it in a sunny place for a few days and wait for the chlorine to volatilize.In addition, the temperature of new water can be 1-2 C higher than that of old water, but not too much worse.
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