Hitch-hiker Crab ID please

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I haven't had much news to report recently on my remaining 40L marine tank. But yesterday evening I spotted a 'new' inhabitant that I hadn't seen previously. It was hidden in a hole in one of the rocks but I saw it moving and it appeard crablike. Today I have taken the rock out of the tank and coaxed the crab out of its hole.

Here are some photos of it. The 'body' is about 15mm across, total across the legs is 30-40mm. I think it might be a xanthid crab?

If it's not an evil one I'd like to keep it as it must have grown up in my tank from a microscopic critter. But if it's going to eat my corals and kill my fish then I'll have to consign it to the compost bin :-(

Any thoughts?

Cheers,
Paul
120L: 2 clowns, royal gramma, yellow goby/shrimp pair, zoas, ricordeas, torch, easy SPS
40L: Tiger shrimp and Wheeler goby trio, zoas, ricordea, favia, tree

Asco1104

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Reply #1

Hi Paul

Pointy black pincers and red eyes normally = a potential coral and fish muncher. Mithrix are normally ok if well fed


Tim

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Mol_PMB

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Reply #2

Thanks Tim,
I saw in a different ID thread that the spoon-shaped pincers mean it's an Chlorodiella species, an algae eater (I have seen it scraping rocks and my rocks are losing their purple) but most other threads seem to suggest it's a risk.
Cheers,
Paul
120L: 2 clowns, royal gramma, yellow goby/shrimp pair, zoas, ricordeas, torch, easy SPS
40L: Tiger shrimp and Wheeler goby trio, zoas, ricordea, favia, tree

Mol_PMB

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Reply #3

Here's a closeup of the claws
120L: 2 clowns, royal gramma, yellow goby/shrimp pair, zoas, ricordeas, torch, easy SPS
40L: Tiger shrimp and Wheeler goby trio, zoas, ricordea, favia, tree

Asco1104

  • Tim
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Reply #4

They do look more like a emerald crabs claws, if you can keep a eye on it and feed it some nori it might not both anything.
I fed my emerald some nori before I put it in and it loved it.


Tim

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