If you want to raise tropical fish well, you must start with preparation. 1 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 it is added with two thousandths of salt. Prepare the equipment needed for fish farming. Tropical fish need a circulating pump and a heating rod. If the aquarium is ready, just add a heating rod. The water temperature of tropical fish culture depends on the species of fish. If it is a large family of tropical fish, the water temperature is generally adjusted to 26-28 degrees. If it is a small home for tropical fish, the water temperature should be adjusted to 24-26 degrees. 4 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 fish behave foolishly and gather in a corner, don't buy such fish. Don't put the fish in your fish tank immediately after buying the fish. Put the fish in the fish tank together with the bag for buying the fish, soak it for 15-20 minutes, and then put the fish in your fish tank when the water temperature is consistent. Don't feed the bought fish immediately, wait for three days, and then feed the fish after it adapts to the environment. 7 Don't always change the water during the breeding process, which will cause the fish to get sick and die, and don't bask in the sun, but don't lose sight of the sun. Just put the fish tank where there is no direct sunlight. Don't feed more fish, eat less and eat more meals twice a day, and eat it in 3-5 minutes. 9 Always observe whether the goldfish is abnormal. If you are sick, find it early and treat it early. 10 Change the water every 5-7 days, saving a quarter of the total water consumption. If it is an aquarium, it is enough to completely change the water once every six months or 1 year. Also, when changing water, the temperature difference of water temperature should not be greater than 3 degrees, otherwise the fish will easily get sick. If you do the above, I believe there will be no problem with the fish you want to raise. Well, these are my years of experience in fish farming. I hope I can help you and wish you success in raising fish.