Knobby Starfish (SM)

Species photo: Geraldo da Silva Souza, CC BY-SA 4.0, via iNaturalist

Invertebrates · Starfish

Knobby Starfish (SM)

Echinaster echinophorus

Moderate care
Reef safe with caution

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From our species guide

Care at a glance

Care levelModerate
Reef safeWith caution
TemperamentPeacefulIgnores fish; eats sponges and may eat clams
Temperature75–82 °F
Salinity1.023–1.025 SG
pH8.1–8.4
Min tank55 gallons
Favorite foods
1. Sponges (natural diet)
2. Meaty foods: shrimp, krill
3. Algae film and detritus
Max size3 in (7.6 cm)

In plain words: The knobby starfish is a small sea star. It is bright red or orange. It has five fat arms with round tips. Rows of little bumps run along the top of each arm. That is why people call it knobby. It grows to about the size of a big cookie.

Full species guide → See its family tree

About the Knobby Starfish (SM)