Parablennius tentacularis
The Horned Blenny is a small, character-rich saltwater fish best known for the distinctive fleshy “horns” or tentacles above its eyes. While not brightly colored, the Horned Blenny is highly engaging, offering constant personality and natural behavior that appeals to aquarists who appreciate subtle, interactive reef fish. Horned Blennies typically reach an adult size of 3–4 inches. Their coloration ranges from tan and brown to gray or olive, often mottled or banded to blend seamlessly with rockwork. The signature horn-like cirri above the eyes give the fish a curious, expressive look and may be more pronounced in males. Their elongated body and large eyes contribute to their alert, watchful appearance.
Horned Blennies thrive in aquariums of 20 gallons or larger with ample live rock, crevices, and elevated perching areas. A mature reef environment with natural algae growth is ideal. They are peaceful and compatible with other small, non-aggressive fish but may show territorial behavior toward similar blenny species. Secure rockwork and a tight-fitting lid are recommended, as blennies may jump when startled. With proper habitat and diet, this species is hardy and well suited for both beginner and experienced marine aquarists.
Horned Blennies are primarily omnivorous with a strong herbivorous tendency. In the wild, they graze on algae, biofilm, and small invertebrates. In captivity, they do best with a diet that includes marine algae, spirulina-based foods, high-quality herbivore pellets, and occasional frozen foods such as mysis or finely chopped seafood. Regular access to natural algae growth helps support digestion and overall health.