HCA: Hermit Crab Association

I found my 2 hermies in Squidward's home..a la Sponge Bob. I took pictures because they were acting strange. Not sure if this was good or bad behavior. I did finally intervene and separate them. I also have a video of the interaction. It starts out kinda crappy but gets better with focus. Any thoughts are great appreciated. My little green guy aka The Baby (as he is now known) is smaller than the football.
https://vimeo.com/180545061


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Hmmmm, almost looks like the bigger one was making clear who was the dominant hermie in the tat. Either that or maybe he is interested in Baby's shell ? Do they have plenty of shells available in the tank?

How new are the crabs? To me, it just looked like a dominance display. As long as they aren't digging their claws into each other, I wouldn't worry so much.