Okay...I was staring in my tank (what a surprise..), about a week ago, I saw what looked like a little hermit living in my large piece of live rock! I was like..WOW!

I love having a tank for almost a year and STILL finding new things. Well, anyway...I need help id'ing him. I don't know if he is a hermit or a shrimp. He has two identical pinchers, same length, and same size. They are white in color. When he starts to move out, I notice some antannae stick out. I have yet to see his body or face. The fascinating thing to watch is the entrance to his cave, (about the size of a pencil), cause I have actually watched him remove rocks so he can sit at the entrance, and then when he is bored, move the rocks back!! Sealing off his entrance. From what little description I have given, and behavior, can any one toss up some ideas as to what this guy might be? I would take a pic, but when I tried, he is so small, that the picture doesn't reveal anything.