Mysterious Crab

Hugo Garcia

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I’ve had my tank set up for over a year, and never had added any crabs. My tank is a mostly fish only tank, with 2 anemones and some GSP. So I was caught by surprise one night when I spotted a mysterious crab on the rocks. My theory is that maybe when I was adding pods to the tank, there might some eggs or tiny crab in the bottle. So my concern is if this is a bad crab or a harmless crab. Is have some pictures, and hopefully someone is able to identify it.

471B09F2-A71A-403C-B935-EFF228AEAE61.jpeg 8EC13E08-1C6C-4156-AF24-8A78A8FDB518.jpeg 2B30797C-B6EA-44A1-BF7E-EF9D408E4544.jpeg
 
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WVNed

The fish are staring at me with hungry eyes.
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In that kind of tank I wouldn't worry about it. It looks almost like a sally lightfoot crab.
All crabs start tiny but the ones that get big do so pretty fast. The size of your hand in a year.
IMG_3694-M.jpg

I have some in my tank and their full grown size is about 1.5 inches. I leave them alone.
 
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