Description

Flame Tail Black Blenny (Ecsenius sp.)

The Flame Tail Black Blenny is a visually striking marine fish admired for its sleek black body contrasted with a vibrant red-orange tail. Belonging to the Ecsenius genus, this blenny combines beauty, personality, and utility, making it a popular choice for reef aquariums.

Native to the Indo-Pacific, Flame Tail Black Blennies inhabit shallow reef slopes where they perch on rocks and coral rubble, grazing constantly on algae and biofilm. In the aquarium, they exhibit similar behaviour, hopping between rocks and crevices while actively patrolling their territory. Their bold tail coloration adds a splash of brightness to any marine setup, making them both functional and ornamental.

This species is hardy, reef-safe, and well-suited for hobbyists seeking an active, colourful, and algae-grazing blenny.

Why You’ll Love the Flame Tail Black Blenny

• Sleek black body with vibrant red-orange tail

• Active and curious, exploring rockwork and crevices

• Hardy and reef-safe, compatible with most invertebrates and corals

• Efficient algae grazer, helping maintain clean rock surfaces

• Adds colour and personality to reef aquariums

Appearance & Behaviour

Adults typically reach 10–12 cm, with a slender body and moderately elongated fins. Their black body provides a striking contrast to the fiery tail, creating a jewel-like effect in aquariums.

Flame Tail Blennies are generally peaceful but semi-territorial, particularly toward other blennies of similar size or appearance. They often establish a preferred rock or crevice as their home base and patrol nearby areas for algae and biofilm.

They are bottom- to mid-level dwellers, spending much of their time hopping between rocks and exploring surfaces.

Tank Requirements & Care

Tank Size: Minimum 150–200 litres

Water Parameters:

• Temperature: 24–27°C

• pH: 8.1–8.4

• Salinity: 1.023–1.025

Environment:

• Plenty of live rock with crevices and surfaces to graze

• Moderate water flow

• Open areas near rockwork for exploration

• Secure lid to prevent jumping

Flame Tail Blennies thrive in established aquariums with healthy algae growth, which supports their grazing behaviour.

Feeding

Flame Tail Blennies are primarily herbivores, feeding on algae and biofilm but will accept supplemental foods:

• Algae and biofilm on rocks

• Algae-based pellets or wafers

• Nori sheets

• Occasional finely chopped frozen foods

Feeding small portions 1–2 times daily ensures healthy colouration and growth.

Reef Compatibility

Flame Tail Blennies are reef safe and generally do not harm corals or invertebrates. They may show mild territoriality toward other blennies, so adequate space and multiple hiding spots are important.

Compatible tankmates:

• • Clownfish

  • Gobies

  • Wrasses

  • Tangs

  • Other peaceful marine fish

Quick Facts

• Common Name: Flame Tail Black Blenny

• Scientific Name: Ecsenius sp.

• Adult Size: 10–12 cm

• Temperament: Peaceful to semi-territorial

• Care Level: Easy to Moderate

• Diet: Herbivore / Algae grazer

• Reef Safe: Yes

• Water Type: Marine (Saltwater)

Flame Tail Black Blenny Tankmate Compatibility Guide

Flame Tail Blennies can coexist with other reef-safe fish, but caution is needed when keeping multiple semi-territorial blennies.

Midas Blenny (Ecsenius midas) – Usually Compatible

• Mid-water swimmer; minimal territorial overlap

Highfin Fangblenny (Meiacanthus sp.) – Usually Compatible

• Open-water swimmer; minimal conflict

Lawnmower / Rockskipper Blenny – Usually Compatible

• Bottom dwellers; ensure sufficient rockwork

Bicolor Blenny (Ecsenius bicolor) – Moderate Compatibility

• Similar body shape; multiple territories reduce conflicts

General Tips:

• Provide abundant rockwork and hiding spots

• Maintain sufficient tank size (200+ litres)

• Introduce multiple blennies simultaneously when possible

• Observe behaviour in the first week to manage minor territorial disputes