Fourline Blenny

Geographical Origin and Habitat: Native to the Western Pacific, particularly the Great Barrier Reef, Coral Sea, and adjacent Australian waters. It inhabits shallow coral reefs and rubble zones with heavy algae growth at depths of 1 to 15 meters.

Taxonomy and Morphology: Member of the Blenniidae family, genus Ecsenius. Described by Victor G. Springer in 1988. Features an elongated body, a blunt head with large expressive eyes, and comb-like teeth adapted for grazing. Grows up to 5 cm in length.

Social Behavior: Diurnal, highly active, and full of personality. It spends its time perching on rock ledges, darting out to graze, and observing its surroundings. Generally peaceful toward tankmates, but can be territorial toward conspecifics.

Coloration and Sexual Dimorphism: Body is light grey to pale brown, marked by four distinct, thin black longitudinal stripes running along the upper half of the body. Eyes feature a golden iris. No major visible sexual dimorphism exists.

Aquarium Setup: Minimum tank size of 100 liters (approx. 26 gallons). Plenty of mature live rock is essential to provide grazing surfaces, perching spots, and hiding places. Provide moderate water flow and plenty of swimming room.

Diet and Feeding: Primarily herbivorous. Diet must consist of marine algae, spirulina-based flakes or pellets, and dried nori sheets. Supplement with occasional offerings of frozen foods like brine shrimp or mysis for protein variety.

Water Quality: Maintain standard marine parameters: temperature 22-26°C (72-79°F), pH 8.1-8.4, specific gravity 1.021-1.025. High oxygen levels and efficient biological filtration are required to keep ammonia and nitrite at zero.

Compatibility and Cohabitation: Fully reef-safe and peaceful with open-water fish. It makes a great companion for gobies, clownfish, and small wrasses. Avoid keeping with other Ecsenius species or similarly shaped blennies unless the tank is very large.

Aquarium Breeding: Spawning in home aquariums is rare. They lay adhesive eggs inside rock crevices or empty shells, which are guarded by the male. Raising the resulting planktonic larvae is extremely difficult without specialized greenwater setups.

Risks and Diseases: They are prone to jumping out of the tank when startled, so a tight-fitting lid or mesh net is mandatory. They can suffer from starvation if introduced into a brand-new, sterile aquarium lacking established micro-algae growth.