Overview
The Horseshoe Crab (Limulus polyphemus) is a advanced saltwater species known for its brown-gray coloration. Living fossil. Bottom.
Origin & Appearance
Origin: Atlantic Americas.
Colors: Brown-Gray.
Body Shape: Crab (wide carapace). Typical adult dimensions: 42.0 x 60.0 x 24.0.
Sexual Dimorphism: Moderate; males have narrower abdomen.
Tank & Water Requirements
| Min Tank Size | 125 gallons |
| Temperature | 64–72°F |
| pH Range | 8.1–8.4 |
| Water Hardness (GH) | dKH 8-12 |
| Bioload | high |
| Oxygen Demand | medium |
| Plant Safe | yes |
| Aquarium Position | Bottom |
Behavior & Activity
Slow sand plower; pushes through sand with armored body; flips using tail spike if overturned; ancient locomotion
Speed: 15/100Aggression: 1/10diurnal
Breeding
Difficult; larvae need saltwater
Common Diseases
💊 Molt failure💊 bacterial
Expert Notes
Living fossil; needs huge sandy tank; cold water