Hermit crab and sps

Any one else's hermit crabs enjoy perching on their acros? I'm not sure if they all are doing it or if it is just this one ( I honestly think it is just this guy). And he perches on multiple of my acros at the highest points on my tank. Its nit bad for the chiral is it?

(ps sorry if this isn't in the right section)

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He's probably going in between, grabbing bits of food that are stuck in there.

 

Just like blackraven said probably grabbing and or looking for food

 

Mine like to do that and don't do any damage.

 

One of mine to this as well..it will sit on one of my monti caps that hangs off the rock like a ledge.doesn't seem to bother the coral at all..

 

I noticed the polyps retract but I never saw any signs of damage. Was more or less curious if any one else witnessed this behavior because it seemed like it was only that one guy lol.

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My emerald crab likes to lay on his back in my birdsnest and nap. I think it's a hammock for the little critters hehe