Find a finger-sized hose about 1 m long, fill it with water, block the pipe head with both hands, put one end in the fish tank, and put the other end in the bucket outside the tank (the port is lower than the bottom of the fish tank), and the water will automatically flow out when you release your hands. If the water tank is not large, please put your hand in the water tank for 2 laps first, concentrate the sundries that sink to the bottom, and then fill the pipeline with tap water. Once the head is enlarged, it will be fine soon. If you drift, you can use a small fine net for 2 laps. In fact, the water is well raised and naturally clear.