Overview
The Sally Lightfoot Crab (Percnon gibbesi) is a intermediate saltwater species known for its brown-green (juvenile), red-orange (adult) coloration. Excellent algae eater. Surfaces.
Origin & Appearance
Origin: Caribbean/Atlantic.
Colors: Brown-Green (juvenile), Red-Orange (adult).
Body Shape: Crab (wide carapace). Typical adult dimensions: 5.6 x 8.0 x 3.2.
Sexual Dimorphism: Moderate; males have narrower abdomen.
Tank & Water Requirements
| Min Tank Size | 30 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
Fast agile rock sprinter; quick sideways running over reef rocks; can jump between surfaces; nocturnal
Speed: 20/100Aggression: 4/10diurnal
Breeding
Difficult; larvae need saltwater
Common Diseases
💊 Molt failure💊 bacterial
Expert Notes
Excellent algae eater; may prey on small fish