Overview:
The Orange Linckia Starfish (Linckia spp., commonly sold as orange Linckia) is best kept only in a mature, stable reef aquarium with abundant live rock and established microfauna. It is highly sensitive to rapid changes in salinity, pH, temperature, and dissolved oxygen, so stability matters more than chasing exact numbers. Aim for 24–26°C (75–79°F), specific gravity 1.025–1.026, pH 8.1–8.4, alkalinity 8–10 dKH, and consistently zero ammonia/nitrite. Keep nitrate low and avoid sudden swings from large water changes. Provide plenty of rockwork for grazing and shaded areas; strong, chaotic flow is helpful, but ensure there are calmer zones so it can move without being flipped. Intakes and overflows should be screened, as this species can wander and get trapped.

Compatibility:
Reef-safe with corals and most sessile invertebrates; it does not hunt fish or corals. The main compatibility concern is predation and harassment. Avoid harlequin shrimp (specialized starfish predators), many triggers, puffers, large wrasses, some hawkfish, and opportunistic crabs that may nip tube feet or damaged tissue. Even “reef” crabs can become problematic if the starfish weakens. Peaceful community fish and typical reef cleanup crews are generally fine. Ensure it cannot be toppled by strong bulldozing snails or large hermits.

Health and Quarantine:
Most losses are from acclimation shock, shipping injury, or long-term starvation. Always use slow drip acclimation (often 2–4+ hours) and match salinity closely; never expose it to air if you can avoid it. Warning signs include paling, failure to grip, persistent limp posture, lesions, and arm tip erosion. Rapid tissue breakdown can follow stress and secondary infection; pristine, stable water and high oxygenation are the best prevention. Quarantine is recommended in a cycled, reef-safe observation tank with live rock for grazing; do not use copper or harsh medications. If issues appear, focus on stability, gentle handling, and removing aggressive tankmates rather than medicating.