Bicolor Blenny 

Also known as Flametail Blenny, Two-colored Blenny

The Bicolor Blenny is a striking and popular species displaying a unique two-toned coloration of blue-gray front and orange-red rear. This personable fish is an excellent algae grazer and adds both beauty and function to reef aquariums with its entertaining personality.

Key Features

• Scientific Name: Ecsenius bicolor
• Common Names: Bicolor Blenny, Flametail Blenny
• Adult Size: Up to 4 inches
• Lifespan: 4-6 years with proper care
• Temperament: Peaceful but can be territorial toward other blennies
• Reef Compatibility: Completely reef safe; will not harm corals or invertebrates
• Minimum Tank Size: 30 gallons minimum; 40+ gallons preferred
• Experience Level: Beginner; hardy and easy to care for

Habitat & Tank Requirements

• Tank Environment: Provide abundant live rock with caves, crevices, and perching spots. This blenny needs hiding places and elevated perches from which to survey its territory. Prefers established tanks with natural algae growth.
• Water Parameters:
  • Temperature: 72-78°F (22-26°C)
  • Salinity: 1.020-1.025
  • pH: 8.1-8.4
  • Tolerant of typical reef conditions
• Equipment Recommendations:
  • Standard filtration system
  • Protein skimmer
  • Moderate water circulation These maintain the stable conditions this species prefers.

Diet & Feeding

Bicolor Blennies are omnivores with herbivorous tendencies. Recommended foods include:

• Staples: Herbivore pellets, spirulina flakes, algae-based foods
• Plant Matter: Nori seaweed, marine algae sheets, spirulina
• Frozen Foods: Mysis shrimp, brine shrimp (occasional protein supplement)
• Natural Grazing: Film algae and microalgae from live rock
• Feeding Frequency: Once or twice daily, plus continuous grazing
• Special Note: Provide regular vegetable matter to maintain health and coloration

Notes & Considerations

• One of the most popular and readily available blenny species in the hobby.
• Excellent algae grazer that helps control nuisance algae growth.
• Very personable with curious, interactive behavior; often becomes a favorite fish.
• Will establish a favorite perch or cave and may defend it from other bottom-dwellers.
• Can be territorial toward other blennies.
• Secure aquarium lid is essential; accomplished jumpers.
• Color intensity may vary based on diet, mood, and environment.
• Generally peaceful toward all non-blenny tankmates.

Why Choose a Quarantined Bicolor Blenny?

Purchasing a quarantined specimen from us means you’re starting with a healthier, better-acclimated fish. All fish are observed, treated as needed, and conditioned to accept prepared foods before sale, giving you a stronger chance of long-term success with this beautiful and functional species.