Rose Starfish

Geographical Origin and Habitat: Nardoa rosea is widely distributed throughout the tropical reefs and lagoons of the Indo-Pacific region. It lives among coral rubble, sandy bottoms, and rocky crevices, seeking zones with moderate water flow and dense micro-fauna.

Taxonomy: Belongs to the class Asteroidea, order Valvatida, and family Ophidiasteridae. The genus Nardoa is characterized by irregular, bumpy skeletal plates covered in fine granules, distinguishing it from other reef starfish.

Social Behavior: Extremely peaceful and solitary. It is entirely reef-safe, spending its time slowly crawling over rocks and sand. It does not threaten corals, sessile invertebrates, or small fish, acting as a quiet member of the clean-up crew.

Coloration and Sexual Dimorphism: Displays a light pink to cream body base, accented by raised, distinct bumps or nodules colored in dark orange, red, or brown. There is no visible sexual dimorphism, and males and females look identical externally.

Tank Setup: A well-established marine aquarium of at least 200 liters is essential. The tank must have been running for at least 10-12 months to ensure sufficient biological maturity and plenty of live rock for natural foraging.

Diet and Feeding: Omnivorous detritivore. It feeds on bacterial biofilms, detritus, microalgae, and organic waste on live rocks. Targeted feeding with small pieces of clam, shrimp, or squid placed directly underneath the starfish can supplement its diet.

Water Quality: Demands pristine, highly stable water parameters: specific gravity 1.023-1.025, temperature 24-26°C, pH 8.1-8.4, and very low nitrates. It has zero tolerance for copper treatments and is highly sensitive to osmotic fluctuations.

Compatibility and Tankmates: Safe with reef fish, corals, and peaceful invertebrates. Do not keep with starfish predators like pufferfish, triggerfish, large wrasses, or Harlequin Shrimp (Hymenocera picta), which feed exclusively on sea stars.

Aquarium Breeding: Breeding in home aquaria is practically non-existent. Like most Valvatida, they reproduce in nature via broadcast spawning, releasing gametes into the water column where fertilization occurs, followed by planktonic larval phases.

Risks and Diseases: Starvation is the leading cause of death in small or sterile aquariums. Rapid changes in salinity or temperature can cause osmotic shock, leading to bacterial infections, tissue necrosis, and eventual disintegration of the limbs.