Overview
The Emerald Crab (Mithraculus sculptus) is a beginner saltwater species known for its emerald green coloration. Eats bubble algae. Bottom to Surfaces.
Origin & Appearance
Origin: Caribbean.
Colors: Emerald Green.
Body Shape: Crab (wide carapace). Typical adult dimensions: 3.5 x 5.0 x 2.0.
Sexual Dimorphism: Moderate; males have narrower abdomen.
Tank & Water Requirements
| Min Tank Size | 11 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 | Bottom to Surfaces |
Behavior & Activity
Reef rock crawler; walks over live rock picking bubble algae; reaches into crevices with claws; nocturnal
Speed: 20/100Aggression: 4/10diurnal
Breeding
Difficult; larvae need saltwater
Common Diseases
💊 Molt failure💊 bacterial
Expert Notes
Eats bubble algae