Goldfish can grow up. Goldfish can grow up to 30 centimeters and live about 10 years. Of course, whether a goldfish can grow up depends on innate genes, acquired feeding methods, and diet. If the owner takes good care of it, feeds it regularly, cleans the fish tank regularly, and raises it with water quality suitable for its survival, the goldfish may still live for 12 years.

Notes on raising goldfish:

1. Goldfish do not have high requirements for water temperature and can live in water temperatures between 0-38°C. It is best to keep the water temperature between 18-25℃.

2. Goldfish do not feel full. It is best for the owner to feed them food regularly and quantitatively, so that they can eat eight times full.

3. Goldfish like slightly alkaline water quality. If possible, it is best to keep the pH value between 7.2-7.4, and it is best to dry the water for several days and ensure sufficient oxygen content.