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Ecsenius bicolor
Bicolor with brown front and orange rear. Humorous algae-grazing behavior on rocks. Expressive face makes it popular.
Blennies are a broad group of small, bottom-dwelling fishes belonging primarily to the family Blenniidae, found across shallow coastal waters and coral reefs worldwide. Recognizable by their large expressive eyes, worm-like undulating movement, and habit of tucking into rock crevices or sandy burrows, they have a devoted following among marine aquarists. The bicolor blenny (Ecsenius bicolor), one of the most popular species in the hobby, displays a striking two-tone pattern of deep blue anteriorly and vivid orange posteriorly. Predominantly herbivorous, it grazes algae from tank walls, substrate, and live rock, earning a useful role as a natural cleaner. A 60-litre or larger aquarium with rock caves or shelter structures is recommended for optimal well-being.
Source: Wikipedia (CC BY-SA 4.0)
The Bicolor Blenny lives 3-6 years.
The Bicolor Blenny grows to 8-10cm.
The ideal water temperature for the Bicolor Blenny is 22〜26℃.
Origin
Shallow coastal waters and coral reefs worldwide, primarily in the Indo-Pacific
Lifespan
3-6 years
Size
Sources: LiveAquaria
Edited & verified by: BreederDirect editorial team
The taxonomic, regulatory, and husbandry data on this page are compiled and verified against the authoritative primary sources below.
Sources: CITES Appendices (species not listed) / Ministry of the Environment Specified Animal List / Ministry of the Environment: List of Designated Invasive Species
Regulations may change. Always verify the latest information with the relevant authorities.
Find listings for this species
8-10cm
Temperature
23〜26℃
Algae, pellet food
No conspecifics — careful with other blennies
Reef-safe — loves hiding in crevices
A tank of 60L or more is the guideline. Adults reach 8–10cm and live on the bottom, grazing algae from the glass and sand.
Providing rock holes or shelters as hideouts helps it settle. It is shy but tames easily, and once used to you it spends more time out of hiding.
Strongly herbivorous, it actively grazes algae from the glass and sand. When algae runs low, supplement with prepared food.
Beginner. This is a beginner-friendly species. No special equipment or experience is required, and it can be kept successfully with basic care setup.
The ideal temperature for Bicolor Blenny is 22〜26℃. Avoid sudden temperature changes and maintain a stable environment.
The average lifespan of Bicolor Blenny is 3-6 years. With proper care and nutrition, they can live a long and healthy life.
Bicolor Blenny typically reaches 8-10cm as an adult. Size may vary depending on care conditions and individual genetics.
Bicolor Blenny feeds on: Algae, pellet food. Aim for a balanced diet with appropriate feeding frequency.
The price of Bicolor Blenny varies significantly depending on morph, size, and lineage. Check our market price page for the latest pricing information.
Last updated: June 23, 2026