Black sailfin blenny

The Black sailfin blenny (Atrosalarias fuscus) is a marine fish characterized by its prominent dorsal fin and predominantly dark, often black body coloration. It is native to the Western Pacific Ocean, commonly found in reef environments. The fish has a slender body and can grow to a modest size, making it recognizable in its habitat. It is known within the aquarium hobby for its unique appearance and algae-eating habits, being a popular choice for reef aquariums due to its utility in controlling algae growth and its generally peaceful temperament towards other tank inhabitants.