The Sailfin Blenny is a small marine fish known for its distinctive dorsal fin, which resembles a sail. Typically found in the warm waters of the Pacific Ocean, this fish can grow up to 4 inches long. It often inhabits rocky reefs and coral environments, where it uses its unique body shape to navigate through crevices. These blennies are primarily herbivorous, feeding on algae and plant matter. They are known for their vibrant colors, which can vary from green to blue, helping them blend into their surroundings. The Sailfin Blenny is a popular choice for home aquariums due to its interesting behavior and striking appearance.