HCA: Hermit Crab Association

I think I figured out why he did this. So, I've been watching him and he has been doing this several time near the water. As far as I know he didn't go into the water(the water is salt water). Then he dug up, burrow down the substrate and he stays until now. I think he was preparing for molting. I h...

I just found out he sometimes doing this and holding its position just like this for a long time. Is this a normal behavior or does it needs some kind of treat?

[img][https://ibb.co/tBHs9nK/img]