Overview
The Horn Shark (Heterodontus francisci) is a advanced saltwater species known for its gray-brown, dark spots coloration. Cold-water. Bottom.
Origin & Appearance
Origin: Eastern Pacific.
Colors: Gray-Brown, Dark spots.
Body Shape: Fusiform (torpedo/streamlined). Typical adult dimensions: 122.0 x 22.0 x 36.6.
Sexual Dimorphism: Moderate; males have claspers.
Tank & Water Requirements
| Min Tank Size | 396 gallons |
| Temperature | 59–72°F |
| pH Range | 8.1–8.4 |
| Water Hardness (GH) | dKH 8-12 |
| Bioload | very-high |
| Oxygen Demand | high |
| Plant Safe | yes |
| Aquarium Position | Bottom |
Behavior & Activity
Slow bottom crawler; wedges into rocky crevices during day; nocturnal hunting; crunches urchins with molar-like teeth
Speed: 35/100Aggression: 4/10nocturnal
Breeding
Moderate; egg layer (oviparous)
Common Diseases
💊 Hardy💊 needs pristine water
Expert Notes
Cold-water; docile; eats urchins and crustaceans