Mithraculus sculptus
The Emerald Crab is the go-to solution for bubble algae (Valonia) — one of the few creatures that will reliably eat it. Its bright green coloration and relatively small size make it a useful and attractive addition to reef tanks. Generally reef-safe but large specimens may become opportunistic and pick at corals or small polyps if underfed, so keep well-fed with supplemental algae sheets.
Want to check compatibility with your tank?
Try the Compatibility CheckerSee how Emerald Crab gets along with every other species in our database.
Build your reef tank and check compatibility in real time
Open Reeforia Compatibility Tool