No molting going on. He's only been in the tank about two weeks. The blennie is my suspect. They are about the same size and the blennie is kind of pushy. The Mandarin's mouth seems to small and the skunk shrimp is a little smaller than the banded. Could it be a molt? I have not gotten a real good look at him. Would he molt only an arm? That is all I have seen in the tank so far. I have seen enough of him to see that the other large arm is still atached. I will try to get a shot of him tonight. He is pretty shy.