Fang Blenny

Overview

The Fang Blenny, in this case the Yellowtail Fang Blenny, is a slender, pale blue-to-yellow fish with a distinctive black stripe through the eye and a yellow tail, belonging to a group of blennies equipped with venomous fangs used purely for defence. It's primarily a planktivore, feeding on small zooplankton in the water column rather than grazing algae.

It's a hardy, easygoing fish that rarely causes problems in a community reef tank, and its venomous bite — while capable of deterring predators or overly curious fish — poses no real threat to humans beyond a mild, temporary sting if handled carelessly.

Its calm temperament and full reef safety make it a solid choice for a peaceful reef community, though it should not be kept with other similarly patterned fang blennies due to potential territorial conflict.

Compatibility

Fang Blennies are peaceful toward the vast majority of tankmates and fully reef safe, ignoring corals and invertebrates. Their venomous fangs are used defensively rather than offensively, discouraging predation attempts rather than initiating conflict.

Avoid keeping with other fang blennies of similar colouration or body shape, as this can lead to territorial disputes.

Health & quarantine

This is a hardy, adaptable species with few chronic health issues, and its venomous fangs actually offer it some natural protection from predatory tankmates. Standard quarantine of two to four weeks is recommended as good practice, and care should be taken when netting or handling this fish given its capacity to deliver a mild defensive bite.