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Old 12-01-2005, 02:32 PM   #1
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Emerald Crabs, reef safe or not?

I had an Emerald Crab for a long time and it was very peaceful, it would run around the edges of the tank and night and go about its life without disturbing anything. It molted and then was promptly was eaten by tankmates with no prior warning a few months back.

Three weeks ago I bought another Emerald Crab from the same LFS. The new Crab did not seem to mind being out with the tank light on too much for the first day so I was happy with it. The next night I was suspiciously missing some Green Star Polyps. The night after that, my Toadstool has very noticable gashes in it, and my Sinularia and Xenia was in bad shape. I checked with a LFS and they reccomend that I try feeding the Crab Nori every night for a while since it could be malnourished from when I bought it. The Crab would eat the Nori however I kept losting pieces of coral, just at a slower pace. Finally I caught the Crab standing on my Sinularia and just eating it in the middle of the tank. The Crab is no longer in my tank, and my Corals are growing back.

How often does this happen? Should I just try another Emerald Crab or move onto something else like a Porcelain crab?
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Old 12-01-2005, 02:34 PM   #2
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They're usually OK in a reef. Is it green?
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Old 12-01-2005, 02:35 PM   #3
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Good to know because I have been debating trying an emerald crab in my coral tank
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Old 12-01-2005, 02:52 PM   #4
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No crab is truely reef safe and even though the emerald mythrax crabs are known for eating algae, all crabs are opportunists. It's not uncommon to get a rouge crab.
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Old 12-01-2005, 05:01 PM   #5
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As Fluff mentioned, Emerald crabs are opportunistic. They are going to eat what is available and plentiful. I, personally, have never had a problem with emeralds in reefs. But if there is not enough food available, it is not uncommon for them to give your corals and smaller inverts a try. HTH and Good Luck!
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Old 12-01-2005, 05:02 PM   #6
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As Fluff mentioned, Emerald crabs are opportunistic. They are going to eat what is available and plentiful. I, personally, have never had a problem with emeralds in reefs. But if there is not enough food available, it is not uncommon for them to give your corals and smaller inverts a try. HTH and Good Luck!
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Old 12-02-2005, 06:59 PM   #7
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I have two in my nano and four in my 72gal. They do not seem to bother a thing. They do climb on my encrusting corals like GSP in searc of food but never seem to do any damage.
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Old 12-02-2005, 09:00 PM   #8
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Never had a problem with kine, the only thing I hate about it is that sometimes it robs my LPS's food when I feed them at night...
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Old 12-02-2005, 09:23 PM   #9
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If you look between the joints inbetween the claw and arm you should be able to see some red color there., indicating it's reef safeness. I had two, but one never made it all the way through a molt and stayed white for some time before finally dieing on me. The other crab has grown quite large and is a very interesting character..

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Old 12-03-2005, 04:02 PM   #10
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My Buddy and I have a few in our reefs with no problems (knock on wood)
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