Algae Blenny (Salarias fasciatus) – The Lawnmower Blenny
The Algae Blenny, also known as the Lawnmower Blenny, is safe for corals and invertebrates. It has a fascinating personality and brings endless entertainment to any aquarium.
Algae Blennies will perch on rocks, hide in caves, and move around the tank, rasping microalgae off surfaces. They are generally peaceful but should not be kept together in pairs unless specifically paired.
Requires a 30-gallon or larger aquarium. Feed spirulina, herbivore frozen foods, algae sheets, and mixes such as Rods or LRS. Maximum size reaches about 5 inches.
| Key Features | Details |
|---|---|
| Species | Salarias fasciatus |
| Size | Up to 5 inches |
| Water Tank Size | 30 gallons or larger |
| Feeding | Spirulina, herbivore frozen foods, algae sheets, Rods, LRS |
| Compatibility | Peaceful with most fish; avoid similar-shaped species |
FAQ
Can I keep two Algae Blennies together?
It is not recommended to keep two Algae Blennies together. They may become aggressive toward each other. If you wish to keep them, they should be paired carefully and only if they are compatible in behavior.
What kind of food should I feed my Algae Blenny?
Feed spirulina, herbivore frozen foods, algae sheets, and popular mixes such as Rods or LRS.
Is the Algae Blenny safe for corals and invertebrates?
Yes, the Algae Blenny is safe for corals and invertebrates and does not harm them.



Dylan Jackson –
The Algae Blenny is a delightful addition to my 40-gallon tank. It spends most of its time on rocks and caves, gently cleaning algae off surfaces. It’s very active and entertaining to watch. I feed it spirulina and algae sheets daily. It’s peaceful and doesn’t bother other fish.
Oliver Clark –
I bought this blenny for algae control and it’s been working well. It’s curious and likes to explore. I keep it alone because I read that pairing can cause stress. Feeding it frozen herbivore food and spirulina keeps it healthy.
Zoe Reid –
Great fish for a reef tank. It doesn’t damage corals and actually helps keep surfaces clean. The movement and behavior are fascinating. I’ve had it for three months and it’s still active and healthy.