Goldfish should prepare an spawning pond before spawning, and put bundles of aquatic plants in it. The temperature should be the same as that of the aquarium where the parent fish live, and the temperature difference should not exceed one degree Celsius. When the parent fish is chasing fiercely, put it into the spawning pool, preferably with water to move. Stimulated by fresh water and fish nests, they will definitely lay eggs from early morning to the next morning. After spawning, the parent fish are fished back to rest, and the fish eggs are hatched in another incubator. In order to prevent the invasion of water mold, you can put some furacilin, just a little color. Depending on the temperature, the incubation period of fish eggs is three to seven days, and the optimal incubation period is seven days.