I have had my male Harlequin for about 8 months. Eats good, looks healthy, have had no problems until about a month ago. I noticed he had a black spot on his left claw by the little pincher. I thought that was weird but he did not act funny. Now today, I just noticed his whole left claw was gone. His arm that it attaches to was there and he was moving it around but the "paddle" part was gone. The right side looks normal and he is eating and acting normal. Is this something to worry about and normal or should I be concerned?