The Salarias fasciatus goes by many names: Jeweled Rockskipper, Sailfin Blenny, Rock Blenny, and my personal go-to, the Lawnmower Blenny. Turn one loose in your reef and it will go to town on that algae. They have a mottled appearance that consists of bands, stripes, and spots in hues of brown, green, and cream. Their color patterns typically help them to blend into the reef substrate.
The Lawnmower Blenny grows up to 5 inches long and does best in well-established aquariums with adequate algae to feed on. They usually live between 2-4 years. Your tank should be at least 30 gallons and have some type of enclosure over the top to protect the Lawnmower Blenny from itself as it could jump right out of the tank if it gets spooked. Like most other Blennies, the Lawnmower Blenny will perch on live rock, hide in caves, graze on algae, and lay on the substrate while watching you suspiciously. When startled, the Lawnmower's first instinct is to madly dash for the nearest hole or cave.
Lawnmower Blennies can be territorial when they pick a prized cave, but most of their aggression is directed at other blennies (or similarly shaped fish) that are of equal or lesser size. It is not recommended to have more than one Lawnmower Blenny in a tank unless they are a mated pair as they will most likely harm each other. Well-fed, with enough space, and under normal conditions, your Lawnmower Blenny will be good-natured and fun to watch. The Lawnmower Blenny is a handy fish with a lot of personality that moves through the water with the grace of a snake.