Emerald/Ruby Mithrax Crab*

Our crabs are guaranteed to eat bubble algae or we will refund the cost to you.

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.

This item requires Next Day Service.


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Express Mail orders placed today will ship Thursday, August 17th. Priority Mail resumes Monday, August 21st. Later dates available by request.

Use the code "5off" to get $5 off any order over $55, rock excluded.

By default, our packages will ship "Deliver to Customer or Door". However, you should always keep an eye out for the package on delivery day - especially if you live in an apartment with a common mailbox or parcel locker where packages are delivered. You should arrange to be home to accept live packages. Packages are often left in mailboxes and around doors you may not frequently use. Please do not let it sit outside for hours or days if there are live animals inside. Abandonment and neglect will lead to losses. Please be pro-active.

 Items marked with a * require Express Mail.