Hitchhiker crab

bradam

New member
So I was adding some liverock to my tank I've had cooking/cycling on the porch ever since my tank crashed last year and just happened to turn on rock sideways and peeked down a tunnel in the rock and to my surprise I saw some brown hairy legs. My first thought was OH SH!! its one of these

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Fighting the urge to throw the rock across the room I instead put it in an empty 10 gallon tank I happened to have nearby. Added some water and hit the tunnel with a mag 9.5 exhaust (overkill I know), and out of the other end of the tunnel came this very hairy little brown crab with some very beefy claws. I took the rock out and chased him around with the net for a bit before he just up and jumped into my hand.

Dropped the net and a quick crappy cell phone camera later here he is..

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No clue what he is or eats or has been eating. Anyone know? He's mostly brown, alot of hair, has extremely sharp back needle points on his leg tips and claws that are wider then his body.

I didn't want to put him in the main tank without knowing what he is, and I couldn't bare to kill the little bugger so I plopped him down in the refugeium for now. Gotta give the little guy credit, he some how surived not only the tank crash, but sitting out on the driveway under the warm florida sun for a couple days, then 12ish weeks of rock cooking/cycling on my back porch in the dark in a 44 gal brute trash can.
 
eep! after reading about gorilla crab terror stories I'm hoping I dont have anymore then just him. He has to have been in my main tank for 4-5 years, if not longer. Maybe that explains why I couldn't ever seem to keep sand sifting gobies for longer then a week haha

hate to kill the bugger as he's rather neat looking. Wonder if he'll surive in the fuge... hope he like vegetarian meals
 
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What about this crab, not a very good pic, it is very little, is it good or bad?
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Then there is this one also
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I've had a few hitch hikers on my live rock!! But I believe that they were called teddy bear crabs. They were similar looking , but the claws weren't really sharp.
 
What baffles me the most is I've had this little guy for atleast 4-5 years and never knew it. Quite the sneaky little fella lol

From what I've read seems these little guys eat whatever the can catch, and I did buy a couple emerald crabs years ago that promptly disapeared, wonder if he ate them on me? I bought blue/scarlett hermits eons ago and I still have a few of them left, maybe they have better self defense?

Whats the best way to see if I happen to have anymore lurking about? Hate to drop in a few more emerald crabs just to see if they get eaten or not.
 
What we do is look in the holes of the rock, when the lights are off. Then you set a trap, a piece of shrimp in a glass. Lean it up against the rock that the crab is in. The crab goes in the glass to eat the shrimp. The crab cannot climb out of the glass if it is smooth. This is what I was told. I have yet to catch one this way.
We pull the rock and shoot hot water in the hole. or we stab at the hole until we kill it. I do not recommend this way if you have neat stuff on the rock, you could hurt the neat stuff.
There are other ways of catching them, check RC threads.
 
Well, the truth is that you have to identify crabs based on structures and not colors.
A lot of crab species can only be differentiated by opening them up. Since all crabs are opportunistic omnivores you might as well take caution with this one.
 
I also was told that if the tips of the claws are black that you don't want them. Bad Crabs
Forget that, pls. It's really not true. There are many crabs in the Xanthoidea with black claw tips which mainly feed on algae "“ and there are many other crabs with black claw tips which are quite some predators catching everything they can. What helps more: The first ones have spoony claw tips and the latter have sharp tips. ;) Anyway (almost) every crab is indeed an opportunistic omnivore as AJSTITAN14 already mentioned. So even algae eaters like Mithraculus sculptus (the so often mentioned Emerald crab) are very fond of some carnal food.
 
Thanks Beastie, I did not know that. From what I was told, to get rid of all black tips. I will check the claws to make sure now.
 
You're welcome. ;) I read it often so it's not unusual people think so.

Here You see a spoony-form claw from a Mithraculus sculptus, good for scraping off rocks for algae:
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