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The Emerald Crab (Mithraculus sculptus) is a powerhouse addition to any marine reef aquarium, blending high-impact aesthetics with essential utility. Featuring a distinct, shiny emerald-green carapace and hairy legs, this industrious crustacean is a master of the "nuisance management" era of reef keeping—serving as a natural biological control for problematic bubble algae (Ventricaria ventricosa). It is a dedicated scavenger of the rockwork and crevices, making it a functional cornerstone of a healthy reef ecosystem.
This hardy crab thrives in established systems with plenty of live rock to provide hiding spots and foraging surfaces. While generally peaceful and reef-compatible, its bold personality makes it a standout member of any clean-up crew, as it tirelessly picks at filamentous algae and uneaten meaty debris. To ensure long-term health, supplement its diet with dried seaweed and high-quality sinking pellets if algae supplies are low. Ensure your aquarium maintains stable magnesium and iodine levels, as these are essential for successful molting and the development of its exoskeleton.
Note: Images shown are stock images and not the actual crabs you will receive.
Care Level: Easy
Temperament: Peaceful
Minimum Tank Size: 10 Gallons
Diet: Omnivore
Reef Compatible: Yes
Max Size: 2 Inches
Water Conditions: 72 to 78°F, dKH 8 to 12, pH 8.1 to 8.4, sg 1.023 to 1.025
The Emerald Crab is a strategic choice for hobbyists looking for "biological filtration" targeting specific algae types that snails often ignore. Its ability to navigate tight spaces within the reef structure adds a layer of maintenance to the hardscape that helps prevent algae from overtaking coral colonies. In the context of modern reef keeping, it is widely considered an essential "utility invertebrate" for maintaining a pristine rock appearance. For maximum success, avoid housing with large, predatory fish and ensure a steady supply of calcium to facilitate regular and healthy molting.
We’ve dialed in the logistics for national Overnight Delivery to ensure your livestock arrives in peak condition. Every order is packed using professional-grade insulation and climate-contingent heat or ice packs, designed to maintain stable temperatures throughout the journey. We handle the technical side of the move so you can focus on the acclimation. Our protocol is built on getting these invertebrates from the facility to your tank with zero compromise on health or vitality.
The Emerald Crab (Mithraculus sculptus) is a powerhouse addition to any marine reef aquarium, blending high-impact aesthetics with essential utility. Featuring a distinct, shiny emerald-green carapace and hairy legs, this industrious crustacean is a master of the "nuisance management" era of reef keeping—serving as a natural biological control for problematic bubble algae (Ventricaria ventricosa). It is a dedicated scavenger of the rockwork and crevices, making it a functional cornerstone of a healthy reef ecosystem.
This hardy crab thrives in established systems with plenty of live rock to provide hiding spots and foraging surfaces. While generally peaceful and reef-compatible, its bold personality makes it a standout member of any clean-up crew, as it tirelessly picks at filamentous algae and uneaten meaty debris. To ensure long-term health, supplement its diet with dried seaweed and high-quality sinking pellets if algae supplies are low. Ensure your aquarium maintains stable magnesium and iodine levels, as these are essential for successful molting and the development of its exoskeleton.
Note: Images shown are stock images and not the actual crabs you will receive.
Care Level: Easy
Temperament: Peaceful
Minimum Tank Size: 10 Gallons
Diet: Omnivore
Reef Compatible: Yes
Max Size: 2 Inches
Water Conditions: 72 to 78°F, dKH 8 to 12, pH 8.1 to 8.4, sg 1.023 to 1.025
The Emerald Crab is a strategic choice for hobbyists looking for "biological filtration" targeting specific algae types that snails often ignore. Its ability to navigate tight spaces within the reef structure adds a layer of maintenance to the hardscape that helps prevent algae from overtaking coral colonies. In the context of modern reef keeping, it is widely considered an essential "utility invertebrate" for maintaining a pristine rock appearance. For maximum success, avoid housing with large, predatory fish and ensure a steady supply of calcium to facilitate regular and healthy molting.
We’ve dialed in the logistics for national Overnight Delivery to ensure your livestock arrives in peak condition. Every order is packed using professional-grade insulation and climate-contingent heat or ice packs, designed to maintain stable temperatures throughout the journey. We handle the technical side of the move so you can focus on the acclimation. Our protocol is built on getting these invertebrates from the facility to your tank with zero compromise on health or vitality.
