Wow, this is really not what I wanted to hear as I've been planning on adding emerald crabs after my rock is finished cooking. How large is this crab??
Wait, he was missing legs when he went in, and you haven't seen him since he came out? How do you know something didn't eat his legs, grab him and pull him inside a cave? And then when this thing was done eating him, went and rampaged throughout your tank. Could be a mantis shrimp maybe
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