The Ranchu has a strongly curved back near the tail and no dorsal fin. Head growth of Ranchus may not be present in young fish and may take several years to develop fully.
While fancy goldfish, such as the Ranchu, have the same water quality requirements as standard goldfish, such as comets and fantails, they are generally more sensitive to water quality fluctuations and require regular aquarium maintenance to ensure they remain in good health.
Fancy goldfish are more susceptible to suffering from vitamin deficiencies when compared with standard varieties, so it is recommend to include vegetable based foods in their diet. Aquarium Industries Naturals Range Frozen Leafy Spinach is ideal, as it also includes essential vitamins and minerals. Aquatic plants are also a good addition.