Macrocoeloma trispinosum (Decor Crab) | Camouflaged and Reef Cleaner Crab

The Macrocoeloma trispinosum, commonly known as the Decor Crab, is a fascinating crustacean that disguises itself by attaching algae, sponges, or dead coral pieces to its carapace. Native to the reefs of the Western Atlantic and Caribbean, this crab is an excellent detritivore, helping to clean aquariums by feeding on organic waste and algae. However, due to its opportunistic behavior, it should be monitored in reef tanks, as it may occasionally prey on small invertebrates or soft corals.

Key Benefits:

✔ Master of natural camouflage – Blends perfectly into its environment.

✔ Helps keep aquariums clean – Feeds on algae, detritus, and leftover food.

✔ Hardy and adaptable crab – Thrives in well-established marine tanks.

✔ Fascinating behavior – Constantly modifies its appearance with environmental materials.

✔ Reef-safe with caution – May interact with certain invertebrates and soft corals.

Technical Specifications:

• Scientific Name: Macrocoeloma trispinosum

• Average Adult Size: 4-6 cm

• Origin: Caribbean, Western Atlantic

• Ideal Temperature: 24-28°C

• Salinity: 1.023 – 1.025

• pH: 8.1 – 8.4

• Lighting: Low to moderate

• Water Flow: Moderate (avoid strong currents)

Care Instructions & Recommendations:

1️⃣ Compatibility: Can be housed with peaceful fish but should be monitored with delicate invertebrates.

2️⃣ Feeding: Opportunistic omnivore, consumes algae, detritus, and small meaty foods.

3️⃣ Behavior: Semi-nocturnal, more active at night and discreet during the day.

4️⃣ Acclimation: Drip acclimation recommended to prevent osmotic shock.

5️⃣ Maintenance: Provide rock structures and varied substrate to enhance natural camouflage.