Little Nipper Crab (Geograpsus grayi)

Scientific Name

• Geograpsus grayi

Common Name

• Little Nipper Crab
• Gray Grapsus Crab

Origin

• Indo-Pacific region
• Found around islands, mangroves, rocky shores, and beaches
• Common in warm tropical coastal environments

Appearance

• Small crab with a flat, rounded carapace
• Grey to brown coloration (helps camouflage on rocks/sand)
• Strong front claws used for defense and feeding
• Size: typically 3–6 cm (1.2–2.5 inches)

Behavior

• Semi-terrestrial (lives both on land and near water)
• Very fast and active
• Often hides in rocks, burrows, or crevices
• Mostly nocturnal (active at night)
• Can be territorial if crowded

Tank / Habitat Requirements

Setup Type

• Best kept in a paludarium (land + water setup)
• Needs both dry land and shallow water area

Water Conditions

• Temperature: 24–28°C
• pH: 7.0–8.2 (slightly alkaline preferred)
• Clean, low-flow water area

Land Area

• Rocks, driftwood, sand, and hiding caves
• Must be escape-proof (excellent climber)