Bicolor blenny

The Bicolor Blenny is a colourful, entertaining little reef fish known for its distinctive two-tone coloration and huge personality. Adults typically display a dark blue to brown front half that transitions dramatically into a bright yellow-orange tail section, creating the unmistakable “bicolor” appearance.

Bicolor Blennies spend much of their time perched on rockwork or peeking out from small caves and crevices. Once comfortable in the aquarium, they quickly develop a reputation for being curious little characters that keep a close eye on everything happening around them.

They naturally graze on algae and organic films growing across rock surfaces, making an established aquarium with plenty of live rock ideal. Their diet should also be supplemented with marine algae, spirulina-based foods and quality prepared marine foods.

Bicolor Blennies are generally peaceful and reef safe, although they may become territorial toward other blennies or similarly shaped fish. Occasionally, an individual may nip at clam mantles or fleshy corals, so they are generally considered reef safe with some caution.

Provide plenty of rockwork with caves and holes where the blenny can establish its own territory. A secure aquarium lid is also recommended.

Scientific Name: Ecsenius bicolor
Common Name: Bicolor Blenny / Two-Colored Blenny
Maximum Size: Approximately 4”
Temperament: Peaceful to Semi-Aggressive
Reef Safe: Yes, with Caution
Diet: Omnivore / Primarily Herbivorous
Care Level: Easy
Recommended Tank Size: 30+ gallons
Origin: Indo-Pacific

✨ Interesting Fact: Bicolor Blennies love finding a favourite hole in the rockwork and turning it into their personal headquarters. You’ll often see nothing but their head sticking out while they silently judge everyone else in the aquarium. 😂