How big a fish tank does goldfish need depends on their size and the number of cultured goldfish? Goldfish are medium-sized fish, and their body length in adulthood is about 30 cm. If it is an adult goldfish, the breeder only needs to prepare a fish tank between 40-50 cm. If the number of aquaculture is large, it is best to prepare a larger fish tank. In addition, goldfish do not require very high space. As long as the breeder can maintain normal density, they will not fight and compete for food.

1. Water temperature: Goldfish does not require high water temperature. As long as the breeder keeps the water temperature between 18-23 ℃, they can live well. When raising artificially, heating rods can be installed for constant temperature when conditions permit. If you can't install the heating rod, you can wrap insulation cotton around the fish tank and keep the water temperature constant.

2. Water quality: Goldfish have low requirements for water quality. They can live in weak acid, weak base and neutral water. As long as breeders keep the water in which they live clean, there will be no impact on their health.

3. Feeding: Goldfish don't have high requirements for food, so breeders can feed them some good-year shrimp, red worms, yellow mealworms, bread worms, lean meat and other foods. These foods contain more protein and fat, which is of great help to their growth and development. At ordinary times, you can also feed some algae, aquatic plants, moss, vegetables, etc. to improve their resistance and immunity.