how you can not notice something in your tank long enough for it to grow to this size.
I found that bugger when I was doing a bed-check after lights out. I was checking to see how my pod population was doing and I see this cretin moving around under some live rock. I pulled the live rock out from the tank and it took me about 15 minutes of waiting before it crawled from the hole it was wedged in. I put it into a bowl and had to take some pictures.
I'm assuming that it's a safe bet that these aren't the types of crabs that people WANT in their tank. Right now the little bugger (it's about 2" spread out) is in a plastic cup that I put into the refuge. If it gets out, it's either in the refuge for good, or it ends up on the floor and my cats get a treat.
Here's a pic of when I plunked it into the cup and it landed upside down...
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