International Aquatics
Emerald Crab
Emerald Crab
🛡️ International Aquatics Quarantine & Guarantee
All fish are checked by marine vets, given a formalin bath, and held for 14 days in copper-treated systems. We feed Selcon-soaked food with Kanaplex and Metroplex during quarantine. Unless marked, all livestock comes with our 15-Day Guarantee. You will receive a video of your fish eating before shipment. For size preference please add a note on your order and we will match your fish to your requested size. If you just want the fish without our QT process, Please email us directly with your order number. Please note this does waive the 15 day guarantee.
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The Emerald Crab (Mythrax sculptus) is a peaceful species that is reef-safe with caution, admired for its vibrant emerald-green coloration, compact body shape, algae-eating behavior, and its usefulness in controlling bubble algae (Valonia) in reef tanks.
Males typically have slightly larger, more robust claws and broader carapaces, while females/juveniles are generally smaller with narrower bodies and claws, often seen hiding more frequently among live rock.
They reach about 2 to 2.5 inches in adult size and should be housed in aquariums of at least 10 gallons, though larger tanks are recommended for multiple individuals.
Provide plenty of live rock for grazing and hiding, a sandbed, and some shaded or low-light areas, along with stable water parameters (salinity ~1.020–1.025, temp ~72–79°F, pH ~8.1–8.4). A secure lid is recommended—not because they jump, but because they can climb equipment and escape if given the chance.
Diet should consist of algae (especially bubble algae), supplemented with mysis shrimp, brine shrimp, sinking pellets, seaweed sheets (nori), and other plant-based foods. They are natural scavengers and help clean up detritus, but may nip at corals or small inverts if underfed.
With proper care, this crab makes a valuable and attractive addition to reef aquariums, especially for hobbyists looking for natural algae control.
International Aquatics Quarantine & Guarantee: All fish are checked by marine vets, given a formalin bath, and held for 14 days in copper-treated systems. We feed Selcon-soaked food with Kanaplex and Metroplex during quarantine. Unless marked, all livestock comes with our 15-Day Guarantee. You will receive a video of your fish eating before shipment. On request, we also send photos/videos after arrival at IA. Some species are import-to-order (3-10 business days). Many common species are already cleared or near the end of QT.
Several species will be import-to-order and may take anywhere from 3-10 business days to secure. Once your fish is secured, you will be notified, and the quarantine process will then begin.
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