Small blue-legged hermit crab

[Dive Princess]

Two of my small blue legged hermit crabs are climbing all over my Red Sponge Tree. Is this cause for concern?

 

[5gfluvalreef]

I wouldn't worry about it.hermits tend to trample coral..I wake up to a nicely redecorated aquarium once a month..anyways I would only worry about it if your sponge starts looking ugly..