Are my crabs hurting my leather coral?

[drone]

My hermit crabs have taken to sitting in the middle of my leather coral. If I take them off they climb back up again. I can’t see any damage to the coral but I can’t work out what they are doing. Dose anyone know what this behaviour is.

Regards

Jan

[sharktale]

:thumbsup: coral will be fine ,they just like a spot to chill:thumbsup:
richard