Overview
The Long Spine Urchin (Diadema setosum) is a intermediate saltwater species known for its black, long spines coloration. Effective algae control. Surfaces.
Origin & Appearance
Origin: Indo-Pacific.
Colors: Black, Long spines.
Body Shape: Urchin (spherical/spiny). Typical adult dimensions: 10.0 x 10.0 x 7.0.
Sexual Dimorphism: Minimal.
Tank & Water Requirements
| Min Tank Size | 53 gallons |
| Temperature | 75–81°F |
| pH Range | 8.1–8.4 |
| Water Hardness (GH) | dKH 8-12 |
| Bioload | low |
| Oxygen Demand | medium |
| Plant Safe | yes |
| Aquarium Position | Surfaces |
Behavior & Activity
Slow surface grazer; long venomous spines sway while moving; tube feet propel across rocks; nocturnal grazer
Speed: 15/100Aggression: 1/10diurnal
Breeding
Not bred at home; broadcast spawner
Common Diseases
💊 Sensitive to salinity💊 copper
Expert Notes
Effective algae control; sharp venomous spines