The Long Spine Zebra Urchin (Diadema setosum), also known as the Black Longspine Urchin, is a striking and intriguing marine invertebrate. Here is some detailed information about them:
 
Average Size: Typically grows to around 8-10 inches (20-25 cm) in diameter, including spines.
 
Lifespan: Can live up to 5 years or more with proper care.
 
Characteristics:
Notable for its long, thin black spines adorned with distinctive white bands.
Central body is usually dark with a small, bright orange ring around the anus.
Spines are venomous and can cause painful stings, so handle with caution.
 
Habitat:
Native to the Indo-Pacific region, commonly found in coral reefs and rocky coastal areas.
 
Behavior:
Generally peaceful and non-aggressive.
Primarily nocturnal, becoming more active during the night.
Helps keep the aquarium clean by grazing on algae.
 
Tank Size:
Requires a moderately-sized aquarium. A tank of at least 50 gallons is recommended.
 
Care Level:
Moderate. They require stable water conditions and plenty of live rock for grazing.
Reef-safe, though they can dislodge corals and decorations with their spines.
 
Diet:
Herbivorous. Primarily feeds on algae, so a well-established tank with plenty of algae is ideal.
Can be supplemented with dried seaweed or algae wafers if necessary.
 
Water Parameters:
pH: 8.1-8.4
Temperature: 75-82°F (24-28°C)
Salinity: 1.023-1.025 SG
Hardness: 8-12 dKH
 
Note:
Provide ample hiding spots and open areas for grazing.
Due to their venomous spines, use caution when handling or maintaining the tank.
 
Disclaimer: "Please note that these are general guidelines, and for more accurate values or specific care requirements, we encourage you to contact Living Aquarium by phone or in person. Within store hours, our team of experts is always happy to answer any questions you may have and provide personalized guidance on care."