Blennies are a diverse group of marine and some freshwater fish known for their distinct, elongated bodies and curious expressions facilitated by their large eyes and characteristic eyebrow-like ridges. Typically found perched on coral reefs or scuttling along rocky substrates, blennies are small to medium-sized fish that adapt well to life in an aquarium. These fish are generally peaceful, making them excellent additions to many community tanks, though some can be territorial towards their own kind or similar species. Blennies exhibit a range of fascinating behaviors and come in various colors and patterns, adding both visual appeal and personality to their environments. They primarily feed on algae and small invertebrates, making them beneficial for controlling algae growth in captive settings. Their unique appearance and engaging nature make blennies a favorite among aquarists seeking to add some character and natural cleanup to their marine setups.