Pencil Urchin Heterocentrotus sp.

The **Pencil Urchin** is a fascinating and distinctive sea urchin species. These urchins have a spherical body, typically in shades of red or black, with thick spines protruding from the center.

**Pencil Urchins** can grow up to 6 inches and require a minimum tank size of 29 gallons. They are peaceful creatures and coexist well with other fish and invertebrates. However, they may consume sponges and some corals, making them unsuitable for reef tanks. They are ideal for fish-only aquariums with larger fish, as their spines deter predators.

These urchins thrive in aquariums with plenty of established live rock. During the day, **Pencil Urchins** hide among the rocks, emerging at night to graze on algae. They are excellent algae eaters but can dislodge rocks, so ensure your rock formations are stable.

As omnivores, **Pencil Urchins** require a diet rich in greens. While they obtain most nutrients from the tank, you can supplement their diet with nori, marine algae sheets, and high-quality flake and pellet foods.

Contact us anytime for more information about the **Pencil Urchin** and its suitability for your aquarium.

• Tank Capacity: 29 Gallons
• Behavior: Peaceful
• Max Length: 6 inches
• Colors: Red, Black, Tan
• Feeding: Omnivore
• Habitat: Atlantic Ocean, Mexico, Hawaii, Pacific Ocean
• Reef Safe: No
• Skill Level: Intermediate
• Water Parameters: 74-82F, SG 1.020-1.027, pH 7.9-8.5
• Alternate Names: Club Urchin, Mine Urchin

Size Guide: Tiny: Up to 1 inch, Small: Over 1-1.5 inches, Small/Medium: Over 1.5-2.25 inches, Medium: Over 2.25-3 inches, Medium/Large: Over 3-4 inches, Large: Over 4-5 inches, Extra Large: Over 5-6 inches, Extra Extra Large: Over 6 inches