Don't know if yours regenerated its limb already, but mine actually lost BOTH of its claws at the same time after getting tangled in the net when I moved tanks. I felt so bad because he looked so defenseless like a regular shrimp and would just hide behind the rock. But yesterday, just over two weeks after the accident, he emerged from the rock with two new claws! They're a bit smaller than before I think, but for them to come back that quick was amazing nonetheless. I really don't know where they came from since they're pretty big relative to the rest of its body. I wish I had before and after pictures. FWIW, I'd been dosing a little extra iodine as I'd read it promotes the molting process.
