Bicolor Blenny - Ecsenius bicolor
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The Bicolor Blenny (Ecsenius bicolor) is a hardy and entertaining reef fish known for its split coloration—typically a dark front half with a bright orange or yellow rear. This peaceful algae-grazing species is full of personality, often perching in rock crevices and watching the activity of the tank, making it a favorite among reef keepers.
Common Name: Bicolor Blenny
Scientific Name: Ecsenius bicolor
Family: Blenniidae
Size: Up to 4 inches (10 cm)
Temperament: Peaceful
Difficulty: Easy
Reef Safe: Yes
Native Region: Found throughout the Indo-Pacific, commonly inhabiting shallow reef slopes and rocky areas with abundant algae growth.
Tank Size: Minimum of 20 gallons
Temperature: 74–80°F (23–27°C)
pH: 8.0–8.4
Salinity: 1.023–1.025
Substrate: Live rock for grazing, hiding, and perching; provide plenty of caves and ledges for natural behavior.
• Diet: Primarily herbivorous—feeds on film algae and microalgae; supplement with spirulina-based foods, algae sheets, and herbivore pellets.
• Behavior: Peaceful but may show territorial behavior toward similar-looking blennies.
• Reef Compatibility: Excellent for reef tanks and safe with corals and most invertebrates.
• Tankmates: Best with peaceful community fish; avoid highly aggressive species that may harass it.