Forktail Blenny

Greek Name: Meiacanthus atrodorsalis



Forktail Blenny, also known as the Lyretail Fang Blenny or Yellowtail Fang Blenny has caudal fins that resemble the shape of a fork. It has two spines on the exterior that are long and five smaller middle spines. The body color is light blue, which flows like watercolor and then turns blue-yellow towards the end of the tail. Males are typically bigger than females, and they experience several color shifts as they breed.
The Forktail Blenny requires a minimum tank of 30 gallons, with live rock to hunt and for eating. It is best to have just one in the tank except when in a breeding pair. Forktail Blenny is considered venomous and should be treated carefully around children with access to tanks since it can detect fingers as an attack and then deliver a painful bite.


The food should comprise of crustacean flesh that has been finely chopped, mysis, vitamin-rich brine shrimp, and frozen herbivore recipes.


Approximate Size of Purchase 1-1/4″ to 3″


Care Level




Color Form

Blue, Yellow



Reef Compatible


Water Conditions

sg 1.020-1.025, 72-78° F, dKH 8-12, pH 8.1-8.4

Max Size



Indonesia, New Caledonia, Philippines



Minimum Tank

30 gallons


General information regarding Forktail Blenny
The Forktail Blenny has a caudal fin which resembles a fork with two long spines on the outside and five smaller middle spines. The body is a pale blue that flows like watercolor and turns a yellowish-blue at the end of its forked tail. The Forktail Blenny requires live rock to hunt and eat. It is recommended to only have one per tank unless there is a breeding pair. Forktail Blenny is considered venomous and should be kept in a safe area around children as it could detect fingers as attackers and give a painful bite.

Additional information


Large, Medium, Small

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