Red Knobby Starfish
Red Knobby Starfish
Algae Eater
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Red Knobby Starfish (Protoreaster lincki) are large ornamental sea stars known for their bright red to orange coloration and distinctive raised black knobs that cover their body and arms. Native to sandy lagoons and shallow reef environments throughout the Indo-Pacific, these starfish slowly roam across the substrate and rockwork searching for food.
Their bold appearance makes them popular display animals in larger marine aquariums, though they require stable water conditions and a mature system to thrive long term.
Care Requirements
Care Level: Moderate to Difficult – Requires stable water quality and regular feeding
Minimum Tank Size: 75+ gallons
Aquarium Setup: Established aquarium with open sandbed areas, mature live rock, and stable salinity
Red Knobby Starfish do best in mature aquariums with plenty of space to move and forage. Stable parameters are extremely important, as sea stars are sensitive to rapid environmental changes.
Diet & Nutrition
Red Knobby Starfish are opportunistic scavengers that consume meaty foods, detritus, and naturally occurring organic material within the aquarium.
Diet: Omnivore/Scavenger – Feeds on meaty foods and organic matter
Recommended Foods:
- Mysis shrimp
- Chopped shrimp or clam
- Sinking carnivore pellets
- Small pieces of seafood
- Naturally occurring detritus and biofilm
Target feeding several times per week is often recommended, especially in cleaner aquariums with limited natural food availability.
Lifespan & Growth Rate
Lifespan: 3–5+ years
Growth Rate: Slow to Moderate
With stable water quality and consistent feeding, Red Knobby Starfish can maintain healthy tissue and coloration for many years.
Temperament & Compatibility
Temperament: Peaceful – Slow-moving scavenger
Reef Safe? Use Caution
Red Knobby Starfish are generally peaceful toward fish but may consume sessile invertebrates, soft corals, sponges, or other slow-moving organisms if underfed. They are often better suited for fish-only systems or carefully monitored reef aquariums.
Avoid housing them with triggers, puffers, large wrasses, harlequin shrimp, or other species known to prey on echinoderms.
Common Challenges & Considerations
Sensitivity to Salinity Changes
Red Knobby Starfish are highly sensitive to rapid changes in salinity and should always be acclimated slowly.
Starvation Risk
In aquariums without sufficient natural food sources or supplemental feeding, they may slowly decline over time.
Handling Sensitivity
Exposure to air and rough handling can damage delicate tissue and increase stress.
Limited Reef Compatibility
Some individuals may disturb or consume sessile invertebrates while scavenging throughout the aquarium.
Water Conditions
Temperature: 75–77°F
dKH (Alkalinity): 8–9
pH: 8.1–8.3
Specific Gravity: 1.024–1.026
Stable water chemistry, mature biological filtration, and regular feeding are important for maintaining healthy tissue and long-term success with Red Knobby Starfish.
