Crab hitchhiker.. is he eating Coral?

RomoFL

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So I found this really neat looking crab in my tank. Today I found him on one of my loose zoa plugs and I can’t tell if he’s eating the coral or picking at stuff off the peg? Can anyone identify him and also tell me if he’s harmless? BA0C25AB-6350-4B61-A2DC-677F7EFCDC53.jpeg
 

Mikedawg

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Maybe a strawberry crab? If so, harmless. As mentioned above you'll need a better pic, especially of claws
 
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BighohoReef

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With video of it eating my vote is emerald... he's doing his coral cleaning. Mine does a warpath through my GSP looking for algae.
 
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LRT

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It looks hairy. Looks like it's literally pulling coraline off the rocks.
Does it have pointy claws?
Can you pull it out and put it in glass and take a picture?
I think you may want to be sure about this one.
 
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RomoFL

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Good call Fishy212! I looked this up and it definitely looks like a red mithrax. Relative of the emerald crab so I can see why many think it’s an emerald.
I guess I have to keep him fed or he’ll go after my other inverts and Coral. Actually - I am missing a skunk shrimp. No remnants of him anywhere and I just saw him last night!
 

hllb

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Yup, ruby mithrax. Probably reef safe though if they get hungry they may do bad things (as reported by others, I’ve personally never had an issue)
 

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