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Fish tank changing water joke

The correct way to change water is to pour some water, take it out and put it in these waters, then pour all the water out, clean the fish tank, prepare some water and pour it in. Don't put the fish in, let the water in the fish tank stand for half an hour, let the water temperature in the fish tank be the same as the original water temperature, and then put the fish in. In this way, the fish will not have a stress reaction because of the different water temperatures.