Odd hermit

[leftme]

One of my blue legged hermit crab acts strange. It will grab another smaller hermit's shell and hold on to it for a day or so while rocking the shell back and forth every so often. The strange hermit is about double the size of all the other hermits in the tank. I don't know if it is killing the other hermits or just being strange. I want to put it in the sump, but I have 2 other posibly dangerous hitchhiker crabs down there.

Anyone have any ideas?

Clayton