Ruby Red Emerald Crab (Mithraculus ruber)

The Ruby Red Crab (Mithraculus ruber) is prized for its striking color, effective scavenging abilities, and appetite for bubble algae.

Originating from Caribbean reefs, the Ruby Red Crab is nocturnal, seeking shelter in caves and beneath debris during the day. In domestic aquariums, this Majidae family member thrives in a mature environment with plenty of rock structures and hideaways. Once acclimated, it will venture out during daylight hours to graze on algae.

Proper feeding is essential for the Ruby Red Crab. Many aquarists supplement its diet with high-quality pellet fish food, chopped meats such as shrimp, and dried seaweed. Without adequate nutrition, it may feed on corals, invertebrates, or even small fish. However, when well-fed, most Ruby Red Crabs are notably peaceful with other tank inhabitants and adapt well to reef environments.