No salt is needed for changing water for parrot fish. Parrot fish belongs to freshwater fish. Adding salt to water when changing water is not conducive to its growth, and it will also endanger its health if its concentration is not properly controlled. Usually, when fish get sick, a little salt can be added to water. At this time, the salt added can promote the metabolism of the fish body, and it is more convenient for the therapeutic drugs in water to enter its body, which is more conducive to the recovery of the disease.

If you want to kill bacteria in water when changing water, you can add a little salt appropriately. At this time, crude salt or special salt for aquarium should be used for salt use. Before use, the salt should be dissolved and filtered, and the concentration of salt should be strictly controlled between 0.3% and 0.5% to avoid endangering the health of fish.

Do not put nitrifying bacteria in changing water for parrot fish. Under normal circumstances, it takes about one week for the nitrification circulation system of fresh water tank to be initially established, and about one month for the system to be completely stabilized. After the system is completely stable, it is not necessary to put nitrifying bacteria when changing water, because nitrifying bacteria will parasitize in the filter cotton to maintain the stability of water quality. Usually, it is only necessary to clean the filter cotton with the water in the tank every 10 days. If the filter cotton turns black and green, it is necessary to replace the filter cotton again and consider putting some nitrifying bacteria.

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