Flametail Blenny (Ecsenius Flavipes) saltwater aquarium fish portrait

The Flametail Blenny, Enchelyurus flavipes, is a small combtooth blenny from the Western Pacific and South China Sea, where adults occupy shallow coral reefs. The body is elongated and dark brown to nearly black, offset by yellow across the anal fin, the caudal fin, and the rear half of the dorsal fin. Its head is smooth and free of cirri, which is the quickest way to separate it from the similarly colored Bicolor Blenny at a glance. Adults reach roughly 4 inches.

House adults in a mature marine aquarium of at least 30 gallons built around extensive rockwork. The fish uses that structure constantly, grazing surfaces, claiming perches and observation posts, and darting into crevices when startled, so deep bolt-holes matter as much as open rock face. An aragonite-sand bed and moderate flow suit it well, along with enough open water for short bursts of swimming. A tight-fitting lid is not optional, since blennies of this type are prone to jumping.

Accounts of its natural feeding differ in emphasis. Some observations describe grazing on algae across reef and rubble habitat, while others characterize the species mainly as a picker of zooplankton and drifting particles rather than a committed algae grazer. Either way, treat it as an omnivore and build the menu accordingly rather than relying on grazing alone to keep it fed.

Offer algae-based prepared foods or small pellets alongside frozen mysis shrimp, enriched brine shrimp, and other finely chopped meaty items sized for a small mouth. New arrivals typically take prepared foods readily, which makes establishment straightforward. Small portions once or twice daily work well, and consistent feeding is worth the effort here because underfed individuals are the ones most likely to sample corals and clam mantles.

Algae-Based Pellets Marine Algae Frozen Mysis Shrimp Enriched Brine Shrimp Finely Chopped Meaty Seafood Omnivore Flake
This is an active, inquisitive fish that hops and perches its way around the rockwork, pausing on high points to survey the tank before retreating into a hole. It coexists reasonably with unrelated community fish, but it is semi-aggressive and defends chosen territory against other blennies, elongated gobies, and similarly shaped competitors. Keep a single specimen per aquarium unless you have a confirmed pair. Avoid housing it with aggressive predators or any tankmate large and pushy enough to keep it hiding.

On the reef side, exercise caution. The species is frequently described as compatible with corals and most invertebrates, yet individual fish have been reported nipping or consuming Tridacna clam mantles, sometimes fatally, and nipping at LPS corals when underfed or crowded. Because that risk cannot be predicted specimen by specimen, it is not classified as reef safe here, and it is a poor choice for a display built around ornamental giant clams. Aquarists with mixed reefs who accept the risk should provide generous rockwork, avoid crowding, and feed well.

FAQ

Frequently Asked Questions

About the Flametail Blenny

  • What aquarium size should I plan for?
    Plan on a 30-gallon aquarium or larger for long-term adult housing. Smaller footprints are sometimes suggested, but 30 gallons is the figure most consistently supported.
  • Can a Flametail Blenny be kept with corals and ornamental clams?
    It is not considered reef safe, since some individuals nip or consume Tridacna clam mantles and may harass LPS corals when underfed or crowded. Avoid it in systems featuring ornamental giant clams.
  • Can I keep it with another blenny?
    Usually not. Keep one per aquarium unless you have a confirmed pair, because similar-looking blennies and elongated gobies tend to provoke territorial aggression.