The main food of Lan's hanging is seaweed and algae-eating fish. The general body shape is about 18cm, and the body shape tends to be oval. It is a breeding method of group spawning type. The whole fish is yellow, with many brown worms on the sides and head. It grows in coral reef areas and some coastal areas, and generally lives in groups.

Lan's hanging fish is oval in length and flat on the side. The head is small and the profile of the back of the head is not particularly prominent. The mouth is small, end position, with a row of flat teeth in the upper and lower jaws, the teeth are fixed and immovable, and the tooth margins are notched. The spines of the dorsal and anal fins are sharp, and the rays are not elongated. The pectoral fins are nearly triangular, and the caudal fins are nearly truncate or concave. The body of the adult fish is uniformly yellow, with many brown worms on the body and head, the pelvic fins are dark brown with white margins, the pectoral fins are pale yellow and transparent, the remaining fins are the same color as the body, and the tail spine is brown.