The Knobby Red Starfish (Echinaster echinophorus), sometimes referred to as the Red Thorny Sea Star, is a striking Caribbean sea star recognized for its vivid red to orange coloration and distinctive knobby texture. Native to the tropical western Atlantic and Haitian waters, this unique echinoderm slowly explores live rock and aquarium surfaces while grazing on naturally occurring biofilm, microbial growth, and encrusting organisms. Its bold appearance and unusual texture make it a standout display animal in mature marine aquariums.
Red Knobby Starfish require established aquariums with stable water parameters, including salinity, temperature, and pH. They thrive in environments with minimal water movement and are best suited for saltwater marine tanks that have been cycling for at least 3 to 6 months.
| Specs | Details |
|---|---|
| Scientific Name | Echinaster echinophorus |
| Common Name | Knobby Red Starfish |
| Origin | Tropical western Atlantic, Haitian waters |
| Size | Up to 5 cm (2 inches) in diameter |
| Lifespan | 5 to 10 years |
| Water Temperature | 22–28°C (72–82°F) |
| Salinity | 32–34 ppt |
FAQ
What is the ideal water temperature for a Knobby Red Starfish?
The ideal water temperature ranges from 22 to 28°C (72 to 82°F).
Can Knobby Red Starfish be kept in a beginner marine aquarium?
No, they require a mature, established marine aquarium with stable water conditions and a well-cycled system.
What do Knobby Red Starfish eat?
They graze on biofilm, microbial growth, and encrusting organisms found on live rock and aquarium surfaces.
Neil May –
Added the Knobby Red Starfish to my 120-gallon saltwater tank after it had been cycling for six months. It’s been active and exploring the rockwork since arrival. The vibrant red color and unique knobby texture stand out in the display. No signs of stress or aggression. A great addition to a mature marine setup.
Leonard Dyer –
It arrived healthy and has been settling into the tank well. I noticed it slowly moving across the live rock, feeding on the biofilm. It doesn’t seem to interfere with other inhabitants. A visually striking species that adds character to the tank.
Carolyn Tucker –
After months of waiting, this starfish has become a centerpiece in my tank. The color is vivid and the texture is very unique. I appreciate how it doesn’t require much maintenance and just thrives on natural growths. Very satisfied with the purchase.