Bicolor Blenny; Male – Ecsenius bicolor

Name: Bicolor Blenny; Male - Ecsenius bicolor
Brand: Fish and Coral Store
SKU: 921388
Availability: InStock

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The Bicolor Blenny is also known as the Two-colored Blenny. It is named this way because of the color pattern, the front half of the animal is dull brown to blue and the reverse is orange. Males are typically bigger than females, and they experience several color shifts that include blue during breeding. They are a lot of fun in the aquarium.nnnnTypically, it is found in crevices and rocks at the bottom of their habitat The Bicolor Blenny requires an aquarium of at least 30 gallons, with scattered rocks to perch and conceal.nnnnnnnnThese fishes are generally tranquil tank inhabitants but are known to attack smaller gobies, other blennies, and dartfish. They're generally a good accessory to aquariums with reefs however, be cautious in smaller setups or with corals that are smaller in size in the sense that they are recognized for picking at their mantles in clams as well as at large, fleshy corals with stony calcifications when they are not fed. In larger aquariums, they seldom cause harm to corals or the clams.nnnnnnnnThe diet for the Bicolor Blenny must include vegetables, which includes dried and frozen foods that contain blue-green and marine algae base. The Bicolor Blenny also feeds on (and assists in the control of) algae that grow within the fish tank.nnnnnnnnApproximate Purchase Size: 1-1/4" to 3"

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Fish

Saltwater

Blennies

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Bicolor Blenny Male Ecsenius bicolor with Distinct Two-Tone Contrast

The Bicolor Blenny stands out with a clean split of color, shifting from deep blue in the front half to warm orange toward the tail. It moves in short bursts, hopping between rock surfaces and pausing to observe its surroundings. This constant interaction with the environment gives the aquarium a more active, natural feel.

Male Bicolor Blenny Behavior and Traits

The Bicolor Blenny displays noticeable differences between males and females, especially in maturity. Males often appear slightly larger and can develop more pronounced coloration during breeding periods.

Key male-specific traits include:

Increased color intensity during breeding cycles
More assertive territorial behavior
Slightly larger body size compared to females
Occasional display posturing toward similar species

Despite these traits, the Bicolor Male remains manageable in most community reef systems.

Aquarium Setup for Bicolor Blenny

The Bicolor Male relies on structure rather than open swimming space. It prefers aquariums with multiple perching zones and rock crevices.

Live rock with layered surfaces
Stable reef parameters
Moderate water movement
Defined territories within the aquascape

A well-structured tank helps reduce territorial disputes.

Feeding the Bicolor Blenny

The Bicolor Male primarily consumes plant-based foods and naturally grazes on algae within the tank. It adapts well to prepared diets when offered consistently.

Marine algae sheets
Spirulina flakes or pellets
Herbivore-focused blends
Natural algae growth from rock

Providing steady food sources helps limit coral picking behavior.

Bicolor Blenny Care Details

Care Level: Easy
Temperament: Peaceful with mild territorial tendencies
Color Form: Blue front half with orange rear coloration
Diet: Herbivore
Reef Compatible: With caution
Water Conditions: 72–78°F, pH 8.1–8.4, salinity 1.020–1.025, dKH 8–12
Max Size: Approximately 4 inches
Family: Blenniidae
Minimum Tank Size Requirements: 30 gallons

Appearance and Identification

The Ecsenius bicolor features a sharp division between two color zones rather than a gradient blend. This clean separation makes it easy to identify even among other blenny species. Subtle shifts in tone may appear depending on mood, lighting, and breeding condition.

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