Emerald/Ruby Mithrax Crab*
Mithrax crabs have dull claws that allow them to scrape algae from your liverock, and are good at removing bubble algae, dictyota, some species of caulerpa, and other complex macroalgae. The size of your bubble algae problem will largely determine the amount of emerald crabs that your tank will need to get the job done. Mithrax crabs are omnivores, and will also scavenge for food. They prefer to spend their time on hard surfaces that they can cling to.
Emerald Crabs are somewhat territorial, and may spar at times with other emerald crabs if kept in too high of number for their available space. This usually doesn't result in harm, but it rarely it can. In general, 1 Emerald Crab per 18 pounds of rock in your aquarium should give them enough space to spread out.
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Items marked with a * require Express Mail.