Reef Decorator Crab

Reef Decorator Crab (Camposcia retusa): A quirky, slow‑moving Indo‑Pacific crab famous for covering itself in sponges, algae, and soft corals to create a living camouflage suit. Highly ornamental, reef‑safe with caution, and a favorite “oddity” species for display tanks. 🦀 Identity & Appearance Belongs to the Majidae family (spider/decorator crabs) Compact body with long, spindly legs Carapace and limbs covered in hook‑like setae that hold decorations Natural colors: mottled tan, cream, brown, often completely hidden under attached materials Eyes sit on short stalks; claws are small and not designed for predation 🌍 Distribution & Habitat Found throughout the Indo‑Pacific, including the Red Sea, East Africa, Indonesia, Papua New Guinea, and northern Australia Lives in coral reefs, rubble zones, and sponge‑rich environments Depth range: 1–30 m 🎭 Behavior & Camouflage One of the most extreme decorator species: attaches sponges, tunicates, algae, soft corals, hydroids, and even artificial materials Decorations serve as camouflage, chemical defense, and predator deterrence Slow, deliberate movement; nocturnal foraging Will continually rearrange or replace decorations as they grow or die 🍽️ Diet Omnivorous scavenger Eats detritus, leftover food, algae, and small sessile invertebrates May nip at soft corals or zoanthids if hungry, though usually not destructive 🏠 Aquarium Requirements Minimum tank size: ~30 gallons (114 L) Temperature: 74–80°F (23–27°C) Salinity: 1.024–1.026 pH: 8.1–8.4 Provide rockwork, sponges, and macroalgae for natural decorating Reef‑safe with caution: may take small pieces of soft coral or zoas to use as camouflage Peaceful toward fish and most inverts 🧬 Social Structure & Reproduction Solitary; generally ignores other crabs unless competing for food Females carry eggs under the abdomen Larval development includes multiple planktonic stages; not commonly bred in captivity 📏 Size & Lifespan Carapace size: 2–3 cm, leg span up to 8–10 cm Lifespan: 2–4 years in stable aquaria 🪸 Reef Compatibility Reef‑safe with caution May remove small coral polyps for decoration Excellent scavenger; helps keep rock surfaces clean 🌡️ Conservation Status Not currently listed as threatened Widely distributed and common in the wild