If you want to raise goldfish well, you must start with preparation. 1 The drying water can only be used if it is dried in the sun for 3-7 days, but it is ideal to raise fish with water for 6-7 days, and it can only be used if two thousandths of sea salt is added. Prepare the equipment needed for fish farming. Goldfish need oxygen pump and circulating pump. 3 Pick Fish When you go to buy fish, you tap the wall of the tank with your hand, and the fish who are not sick will come and ask for food. If goldfish behave foolishly and gather in a corner, don't buy such fish. 4 Don't put the goldfish in your fish tank immediately after buying it. Put it in the fish tank together with the bag for buying fish, soak it for 15-20 minutes, and then put it in your fish tank after the water temperature is consistent. Don't feed the goldfish you bought immediately, wait for three days, and then feed them after they adapt to the environment. 6 Keeping goldfish should not change water. Changing water will cause goldfish to get sick and die. Don't bask in the sun, but don't lose sight of the sun. 7 goldfish should not be fed more, eat less and eat more meals, it is better to feed twice a day, and the feeding amount is 3-5 minutes. 8 Always observe whether the goldfish is abnormal. If it is sick, find it early and treat it early. 9 to change water, you need to save water every 3-5 days, and you need to save a quarter of the total water. Change the water every 15-30 days. Be sure to leave some old water. When changing water, the temperature difference should not be greater than 3 degrees, otherwise the fish will get sick easily. If you do the above, I believe your goldfish will not have any problems. These are my years of experience in fish farming. I hope I can help you and wish you success in raising fish.