red claw crab

I got my red claw about a week ago, and I just noticed that he was missing his backmost right leg, and the next leg has a small hole in it. First, will the leg regenerate? And second, should I do something for the hole in his leg? I have no idea what caused it, or if he has a disease. His...

I'm fairly new to having a small aquarium. Maybe a week or so. I bought 2 red claw crabs last week. Before long after putting them in the tank I found both of them on their backs. I did some research and read a lot about molting, so I decided to leave them alone and give it until the next...