The Black Ranchu is a variety of fancy goldfish that is highly sought after for its unique appearance, which includes a prominent head growth or wen and a deep black coloration. They prefer a pH level between 6.5-7.5 and a temperature range of 68-72°F. Black Ranchus are omnivorous and require a balanced diet consisting of high-quality flakes or pellets and fresh vegetables. They also require a well-filtered aquarium with plenty of oxygen and low to moderate water flow. Black Ranchus are peaceful and can be kept with other non-aggressive fish of similar size. However, their wen growth requires special attention to avoid bacterial infections, and regular maintenance is required to keep their water quality in check. With proper care, Black Ranchus can live for up to 10-15 years in captivity.