also known as the Priacanthus hamrur, is a small to medium-sized fish that belongs to the family Priacanthidae. They are commonly found in the tropical waters of the Indo-Pacific, including the Red Sea, and are known for their striking appearance and unique behavior.

Moontail Bigeye typically grow up to a maximum size of 25 cm in length, although most are much smaller, reaching only around 15 cm. They have a somewhat rounded body shape with a large head, small eyes, and a large mouth with sharp teeth. They are characterized by their large dorsal fin, which runs almost the entire length of their body, and their distinctive moon-shaped tail.

The Moontail Bigeye's body is primarily a dark reddish-brown color, while its fins are a bright red or orange. They have a large black spot near the base of their pectoral fins and smaller black spots scattered across their body, which give them a distinctive appearance.

These fish are known to be solitary and territorial, with males being especially aggressive towards one another. They tend to be most active during the night when they hunt for small fish and crustaceans. During the day, they usually hide among rocks and coral, using their camouflage to blend in with their surroundings.

Moontail Bigeye are a popular aquarium fish due to their unique appearance and relatively peaceful nature. However, they require a large tank with plenty of hiding places and suitable lighting. They also require a varied diet that includes both meaty foods and plant matter, and a clean, well-maintained environment to thrive.

In conclusion, the Moontail Bigeye is a unique and fascinating fish that is popular among aquarium enthusiasts. Their striking appearance and nocturnal behavior make them an interesting addition to any tank, but they do require proper care and maintenance to ensure their well-being.