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Old 12-21-2014, 07:39 PM   #1
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What do Emerald Crabs Actually Do?

Considering getting a small one for my 10G.

Read a lot of mixed opinions online about wether they're reef safe or not, wether they actually eat anything, wether they kill other invertebrates...

So can anyone recommend them through personal experience?


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Old 12-21-2014, 09:07 PM   #2
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Crabs are opportunists. They will eat what they can. It will eat algae, but if there aren't any algae it can easily develop a taste for corals.
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Old 12-22-2014, 09:26 PM   #3
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As long as you have algae in your tank it shouldn't eat coral


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Old 12-22-2014, 09:47 PM   #4
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The emerald crab do, what the emerald crab do.

This means eating things they shouldn't. I currently have one, but I watch it closely... very closely. Luckily it's a slow mover, and would be easy to take out. My sally lightfoot crab on the other hand, got a rock smashed on him. He was too fast for his own good. Not to mention he was big enough to eat fish, if he could catch one.
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Old 12-25-2014, 09:04 PM   #5
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I've had from 4 to 6 of them in my 220g tank at all times over the last few years. I've only witnessed them eating algae in the tank with one exception. I had one that occasionally clipped off zoa heads. I will sometimes add a clip of seaweed at night (when the tangs are sleeping) to make sure they have enough to eat.


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Old 12-25-2014, 09:19 PM   #6
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I like to watch them, but I've witnessed them eating soft corals. At one point I would order a dozen at a time because I liked to look at them, and they seem to hide a bit when the lights are on. this way the odds of seeing one were greater in my large tank. It seems that one out of a group would get large and would kill off the rest. I had a large one that liked to hang under a birdsnest colony, but never did anything detrimental to it. Here he was-
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Old 12-26-2014, 12:03 PM   #7
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Is it worth the risk getting one for a 10G?

If not I'll probably just do a Snail only crew.


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Old 12-26-2014, 01:57 PM   #8
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That's hard to say. It's up to whether you like them enough or not. Personally, I don't find snails very exciting.
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Old 12-26-2014, 08:58 PM   #9
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That's hard to say. It's up to whether you like them enough or not. Personally, I don't find snails very exciting.

I'm not too sure any member of the CUC is all that exciting..


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Old 12-27-2014, 01:22 AM   #10
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I think some are pretty interesting my emerald just molted came out looking like the hulk... Now he isn't so shy... Got a fighting conch we nicknamed creeper 😀
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