Algae Lawnmower Blenny - Salarias fasciatus

Algae Blenny (Salarias fasciatus)

Algae Blennies, also known as Lawnmower or Sailfin Blennies, are hardworking herbivores famous for their constant grazing and quirky expressions. With their mottled brown and white bodies, large eyes, and blunt heads, these fish bring both utility and charm to reef aquariums. Their comical personalities and algae-munching habits make them a favorite among hobbyists.

Tank Requirements

Algae Blennies do best in aquariums of 30 gallons or more, with plenty of live rock where they can graze for algae and perch between feedings. They prefer established tanks with ample natural algae growth and hiding spots, but will also adapt well to supplemental feeding.

Natural Clean-Up Crew

These blennies are valued for their appetite for nuisance algae, especially film and hair algae. While they won't replace a full cleanup crew, they serve as an excellent natural helper in keeping unwanted algae in check, especially in mature reef systems.

Diet and Feeding

Primarily herbivorous, Algae Blennies should be provided with a diet rich in marine algae, spirulina, nori sheets, and herbivore pellets. In tanks with limited algae, supplemental feedings are essential to ensure long-term health. Some individuals may also accept small amounts of frozen meaty foods, but greens should make up the bulk of their diet.

Tankmates and Behavior

Generally peaceful, Algae Blennies coexist well in community reef tanks. However, they may show territorial behavior toward other blennies or similarly shaped fish, especially in smaller tanks. They're considered reef-safe and do not bother corals or invertebrates, making them a practical and entertaining addition to most setups.