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Hi we have had my tank set up for a year now and have just found this crab it is about the size of a ten pence piece dark green in colour with white patches round it's pincers, it has been hiding inside a rock anyone any ideas??? Will keep trying for a better pic but it's very nervous!!!
It does look like a emerald crab I would say. Very cool that you just found him after a year! lol If it is an emerald crab; they are a great addition. I have 2 and they are fun to watch at night cleaning up algae (since they tend to hide a lot).
Just remember they molt at times, so you may see a full sized one they may look dead and is actually their molt and they will hide for awhile until their new shell has developed.