The Ranchu Goldfish, often called the “King of Goldfish” in Japan, is a dorsal-less variety with a round body and a pronounced head growth (wen). It has a graceful, waddling swim pattern. Specifications: Scientific Name: Carassius auratus Origin: Japan (selectively bred) Maximum Size: 6-10 inches (15-25 cm) Tank Requirements: Minimum 20 gallons per fish; smooth substrate, well-maintained water conditions Diet:…