Linear Blenny (Ecsenius lineatus)

The Linear Blenny, also commonly referred to as the Lined Blenny or Dot-Dash Blenny, is a charming and inquisitive bottom-dweller from the Indo-West Pacific. It is highly valued for its "comical" facial expressions and its functional role as a specialized algae grazer. Unlike the open-water swimming Fang Blennies, the Linear Blenny spends its time perched on rockwork or peering out from crevices, adding a sense of curiosity and personality to the lower levels of the aquarium.

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Key Information

• Common Names: Linear Blenny, Lined Blenny, Dot-Dash Blenny

• Scientific Name: Ecsenius lineatus

• Origin: Indo-West Pacific (Yemen to Japan, south to Australia)

• Max Size: 9 cm (approx. 3.5 inches)

• Lifespan: 5–7 years

• Temperament: Peaceful; though territorial toward its own kind

• Diet: Herbivore – Specialized algae grazer

• Care Level: Easy

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Appearance & Identification

The Linear Blenny features a distinctive color-blocked aesthetic that makes it easy to spot:

• Two-Tone Body: The upper half is typically a dark brown to black, while the lower half is a contrasting pale white to cream.

• Linear Pattern: A horizontal "dot-dash" or linear pattern of yellow-to-white stripes (or rectangular blotches) runs along the side, separating the dark and light halves.

• Distinctive Eyes: Like many Ecsenius species, it has large, expressive eyes and small "cirri" (whisker-like appendages) above the eyes, giving it a playful, watchful look.

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Behavior & Tank Compatibility

• The Sentry: This fish is famous for its perching behavior. It will claim several "lookout spots" on the live rock and hop between them, watching the activities of the tank.

• Reef Safe (with Caution): Generally considered reef-safe, but underfed individuals may occasionally nip at SPS coral polyps (like Acropora) or clam mantles.

• Aggression: It is peaceful toward non-similar tank mates but can be highly territorial toward other blennies or fish with similar body shapes. Keep only one per tank unless they are a mated pair.

• Tank Mates: Excellent with Clownfish, Anthias, and peaceful Gobies. Avoid housing with aggressive "bullies" that might intimidate it into hiding.

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Ideal Tank Setup

• Tank Size: A minimum of 115L (30 Gallons) is recommended.

• Rockwork is Essential: Requires ample live rock with numerous small holes and crevices for hiding and perching. This also provides the natural microalgae it needs to graze.

• Lid: Like its cousins, the Linear Blenny is an expert jumper. A secure, tight-fitting lid is mandatory.

• Dietary Needs: While it will eat nuisance algae, its diet should be supplemented with spirulina, nori, and high-quality herbivore pellets. Occasional mysis or brine shrimp can be offered as a treat.

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Why Choose the Linear Blenny?

The Linear Blenny is the perfect "character" fish for a reef or FOWLR system. It offers reliable algae control and a unique graphic pattern that stands out against colorful corals. Its hardy nature and ease of care make it a top choice for beginners, while its interactive "personality" ensures it remains a favorite for seasoned aquarists.