Emerald Crab (Mithraculus sculptus) | Reef-Safe Bubble Algae Cleanup Crab

The Emerald Crab (Mithraculus sculptus) is one of the most effective and popular members of a saltwater aquarium clean-up crew. Famous for helping control nuisance bubble algae (Valonia), these hardworking crabs spend their days grazing on algae, scavenging leftover food, and cleaning live rock and aquarium surfaces.

Their vibrant green coloration and entertaining personality make them a favorite among reef hobbyists. When kept well-fed, Emerald Crabs are generally reef-safe and make an excellent addition to both beginner and advanced reef aquariums.

Features

• Natural bubble algae (Valonia) control

• Grazes on nuisance algae and leftover food

• Reef-safe when properly fed

• Hardy and beginner-friendly

• Excellent addition to any clean-up crew

• Helps maintain a healthier reef ecosystem

Care Information

Scientific Name: Mithraculus sculptus
Temperament: Peaceful
Reef Safe: Yes (when adequately fed)
Difficulty: Easy
Diet: Omnivore (Algae, Seaweed, Pellets, Frozen Foods)
Minimum Tank Size: 10 Gallons

Water Parameters

• Temperature: 72–78°F

• Salinity: 1.023–1.026

• pH: 8.1–8.4

Compatibility

Emerald Crabs are compatible with most peaceful reef fish, corals, shrimp, and snails. They should not be housed with aggressive predators such as large wrasses, triggerfish, puffers, or other animals known to prey on crustaceans. If natural algae becomes limited, supplement their diet with dried seaweed or sinking algae-based foods to keep them healthy and reduce the likelihood of them picking at other tank inhabitants.

Why Shop with Infinity and Beyond Aquatics?

At Infinity and Beyond Aquatics, we know purchasing live animals online requires trust. Every order is carefully handled to ensure your new aquarium inhabitants arrive healthy and ready to thrive.

• Carefully inspected before shipment

• Professionally packed in insulated cooler boxes

• Heat or cold packs added when weather requires

• Overnight shipping to minimize transit stress

• Responsive customer service before and after your purchase

• Passionate hobbyists dedicated to helping you succeed

Whether you're building your first reef or expanding an established display, we're committed to delivering healthy livestock with the care your aquarium deserves.

Live Animal Shipping Information

All live fish, corals, and invertebrates are shipped FedEx Priority Overnight in insulated cooler boxes with appropriate heat or cold packs as needed.

• Ships Monday through Thursday only.

• Orders are shipped as quickly as possible during our live animal shipping days.

• Live Animal Shipping is $39.99 on orders containing live fish, corals, or invertebrates.

• Shipping is FREE on qualifying live animal orders of $300 or more.

• We carefully monitor weather conditions and may delay shipment if temperatures are unsafe to help ensure the safe arrival of your livestock.

• Tracking information is emailed as soon as your order ships.

Thank you for trusting Infinity and Beyond Aquatics with your next reef addition!