I had 4 hermit crabs and now I'm down to two. I have one hermit crab who is bigger then my other hermit crabs but .I haven't ever had a problem with them till now .About a couple weeks ago I was checking my hermit crabs when I noticed that my smallest hermit carb wasn't moving and when I looked in on her she wasn't there. So I started investigating and found the biggest hermit crab had pulled her out and killed her and ate her. Then this morning I got up and I caught big boy and he had killed yet again and it was the other small hermit crab. Can some one explain why this is happening. I really like having hermit crabs but if I can't get this fixed then I'm going to give them away.