Banda combtooth blenny

Geographical Origin and Habitat: Ecsenius bandanus is native to the warm tropical waters of the Western Central Pacific Ocean, endemic to Indonesia, specifically around the Banda Sea, the Maluku Islands, and Timor. It inhabits shallow coral reefs, sheltered lagoons, and rubble-rich zones at depths ranging from 1 to 15 meters. It lives in close association with rockwork and soft corals, utilizing empty worm holes and cracks.

Taxonomy and Morphology: Belonging to the family Blenniidae and the genus Ecsenius. It features an elongated, cylindrical, and scaleless body covered in a protective mucus layer. The head is rounded with large, mobile, protruding eyes that provide excellent situational awareness. It has a subterminal mouth with a row of small, flexible, comb-like teeth. Adults reach a maximum length of 4 to 5 centimeters.

Social Behavior: A diurnal, active, and peaceful blenny that spends the day perching on rockwork or coral branches, lifting its head to observe its surroundings. It may exhibit intraspecific territoriality toward other Ecsenius species, especially in smaller tanks. It is peaceful toward unrelated fish and shows curiosity toward its keeper.

Coloration and Sexual Dimorphism: The body coloration is split horizontally: the upper half is dark brownish-black, while the lower half and belly are silvery-white or cream. It often features a bright yellow or orange horizontal stripe running through the eye and extending partially onto the body. There is no visible sexual dimorphism between sexes.

Aquarium Setup: Due to its small size, it can be housed in aquariums or nano reefs starting from 75 liters (approx. 20 gallons). The setup must include plenty of live rock with small holes, crevices, and cavities for the fish to hide. Strong lighting is recommended to encourage the growth of microalgae on the rocks, which forms its primary diet. Cover the tank.

Diet and Feeding: Herbivorous and detritivorous. In captivity, it feeds by grazing on microalgae and organic film on the rocks. The diet should be supplemented with plant-based dry foods, spirulina flakes, dried seaweed (nori) sheets, and small amounts of frozen foods (cyclops, brine shrimp). Do not introduce it into sterile, algae-free aquariums.

Water Quality: Requires stable marine parameters: temperature 23-27°C (73-81°F), pH 8.1-8.4, specific gravity 1.022-1.025, and carbonate hardness (KH) at 8-11 dKH. Efficient filtration and regular water changes are necessary to keep nitrates low. Moderate water flow is recommended to maintain high dissolved oxygen levels.

Compatibility and Cohabitation: 100% reef-safe, making it an ideal inhabitant for tanks with hard and soft corals. It coexists peacefully with small community fish such as clownfish, gobies, pipefish, and small wrasses. Avoid housing it with other territorial Ecsenius blennies in the same tank unless the enclosure is very large.

Aquarium Breeding: Spawning in home aquariums is rare and challenging. They are cave-spawners: the female deposits adhesive eggs inside a hole or empty shell, and the male fertilizes them, taking responsibility for guarding and fanning the nest. The pelagic larvae are extremely difficult to raise in home aquariums.

Risks and Diseases: The primary risk is starvation if introduced into sterile or newly established tanks lacking algae on the rocks. It is also an active jumper, requiring a tight-fitting lid or mesh screen to prevent escapes. It is moderately hardy but can contract skin parasites if subjected to high stress during acclimation.