I'm hoping that's a black emerald crab, I have one that looks exactly like yours in my tank. My friends and I came to the conclusion that it's an emerald, if not I need to go hunting.
i had it in my pico with a baby clown and it didnt bother the clown, so i think its safe. I took it out becasue i thought it ate a sexy shrimp i added a couple days ago, but that turned up today ok, so my bad mr crab.
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