I am new to the crab world. My sister bought me Martin as a gift. Started researching and discovered that two is better than one. I went and saved Bristol from the pet store two days ago. From the minute Martin saw Bristol he has been on top of him. He has been rocking his shell trying to get in for hours and hours. He will not stop til I break them up. Both are chirping really loud. I have concluded that they are shell fighting but I have plenty of other shells in the tank. Martin is a tad bit larger than Bristol so I don't think he can even fit in the shell if Bristol gives up. Please help I have no idea what to do to make them stop. I don't want either one to get hurt. It would just break my heart.