Longspine Urchin - Diadema setosum
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The Longspine Urchin (Diadema setosum) is a striking and highly beneficial marine invertebrate, recognized for its long, thin spines and algae-grazing behavior. This peaceful urchin is an excellent addition to reef aquariums, helping control nuisance algae while adding natural movement.
Common Name: Longspine Urchin
Scientific Name: Diadema setosum
Family: Diadematidae
Size: Up to 20 inches
Temperament: Peaceful
Difficulty: Moderate
Reef Safe: With Caution
Native Region: Found throughout the Indo-Pacific, typically inhabiting reef flats, lagoons, and rocky substrates where algae is abundant.
Tank Size: Minimum of 30 gallons
Temperature: 74–80°F (23–27°C)
pH: 8.0–8.4
Salinity: 1.023–1.025
Substrate: Live rock and open sand areas; ensure plenty of surfaces for grazing and hiding.
• Algae Control: Actively grazes on hair algae, film algae, and detritus, helping maintain a clean tank.
• Behavior: Peaceful but may move frequently across the tank; long spines can injure other invertebrates or humans if handled carelessly.
• Diet: Herbivorous—supplement with dried seaweed if natural algae is limited.
• Tankmates: Compatible with most reef fish and invertebrates; avoid aggressive fish that may damage spines.