Redlip Blenny

Geographical Origin and Habitat: Widespread in the tropical and subtropical Atlantic Ocean: East from Canary Islands, Senegal, and Angola; West from Florida and Bermuda to southern Brazil. Inhabits wave-swept rocky reefs and shallow coral structures down to 10 meters. They are often found in very shallow water, where wave action and sunlight promote algae growth. They inhabit shallow rocky reefs down to about 10 meters.

Taxonomy and Morphology: Member of the family Blenniidae. Features a robust, elongated scaleless body with large eyes and thick, brightly colored lips. Reaches a maximum length of 18 cm. They belong to the family Blenniidae, commonly known as combtooth blennies. Their jaw structure is highly modified for scraping reef surfaces.

Social Behavior: Highly territorial. Aggressively defends a section of rocky reef against any other herbivorous fish invading its grazing area. They exhibit a curious personality, often perching on rocks and watching the room outside the tank. They are highly territorial against similar species.

Coloration and Sexual Dimorphism: Solid dark brown or blackish-brown body, highlighted by thick, intense orange-red or bright red lips. Dorsal and anal fins show red margins. Dimorphism is minimal. Their eyes can move independently, allowing them to watch for predators while feeding. The dark body contrasts sharply with their bright red lips.

Aquarium Setup: Requires a large tank of at least 250 liters with robust rockwork providing caves and ledges. A tight lid is necessary to prevent jumps during sudden dashes. Ensure the rockwork is stable, as they will actively squeeze into tight cracks. Use epoxy to cement large rocks together safely.

Diet and Feeding: Herbivorous detritivore. Consumes large amounts of benthic algae. Provide spirulina, shredded nori sheets, and quality sinking herbivore pellets. Accepts frozen foods. Offer specialized herbivore preparations containing spirulina to support their immune system. Supplement with frozen mysis and brine shrimp.

Water Quality: Stable marine parameters. Temperature 22-26°C, pH 8.1-8.4, salinity SG 1.020-1.026. GH 15-25. Demands good aeration and efficient protein skimming. Use a powerhead to create strong water currents across the main rock structures. Keep nitrate levels as close to zero as possible.

Compatibility and Cohabitation: Reef safe. Excellent algae grazer. However, it will aggressively attack other benthic fish (like gobies or blennies) and surgeonfish. Must be kept singly. They are best kept as the only blenny in smaller aquariums to prevent fighting. They are generally peaceful toward non-competitor species.

Aquarium Breeding: Extremely difficult. Deposits adhesive benthic eggs inside rocky caves, which are guarded fiercely by the male. The male will defend the nest aggressively against any potential threats. Egg clutches are adhesive and attached to rocky ceilings.

Risks and Diseases: Starvation in newly set-up or sterile tanks lacking natural algae biofilm. Sensitive to high nitrates and copper-based medications. Watch for signs of skin parasites, which can be treated with standard marine medications. Ensure the aquarium lid is tightly sealed.