Black Longspine Urchin - Diadema setosum

The Black Longspine Urchin is a fascinating marine creature with exceptionally long, sharp spines for defense against predatory fish. These urchins can grow up to 8 inches and thrive in aquariums of at least 15 gallons. Known for their peaceful nature, they coexist well with other fish, corals, and invertebrates, making them ideal for reef tanks. Additionally, they serve as excellent members of a cleanup crew in fish-only tanks with aggressive species like triggers and puffers, as their spines deter these fish while they clean the tank.

It's important to avoid housing Black Longspine Urchins in soft acrylic tanks, as their spines and mouths can cause scratches. They typically hide among rocks during the day and emerge at night to graze on algae. As herbivores, they require a diet rich in greens, primarily obtained from tank algae, but can be supplemented with nori or marine algae sheets.

Feel free to reach out if you have any questions about whether the Black Longspine Urchin is the right choice for your aquarium.

• Temperament: Peaceful
• Maximum Size: 8 inches
• Tank Size: 15 Gallons
• Diet: Herbivore
• Coloration: Black
• Reef Compatible: Yes (With Caution)
• Regions Found: Indo-Pacific Ocean
• Experience Level: Beginner
• Water Conditions: 74-82F, SG 1.020-1.027, PH 7.9-8.5
• Other Names: Long-spined Sea Urchin, Long Spine Urchin

Extra Small: Up to 1", Small: Over 1-1.5", Medium Small: Over 1.5-2.25", Medium: Over 2.25-3", Medium Large: Over 3-4", Large: Over 4-5", Extra Large: Over 5-6", Jumbo: Over 6"