possible hitchhiker coral?

So i found this thing popping up from a rock in the back of the tank, it's small and brown, i think it might be a mushroom. I can't take a clear pic of it because of the spot that it's in, i've tried multiple angle, multiple settings on my camera and i could not get a clear pic. So the pics are the best i can get, at least it gives an idea of what it is.

I think it's harmless but just want to see if anybody can somewhat tell what it is

 

also just in case if it's bad what do i do to get rid of it

 

lol i have no idea whats going on in that photo

 

it's the little round thing that's sticking up out of the rock, i'll open it in paint and draw an arrow to it and repost the pics if that helps

 

here are the pics again

 

from that pic id say its ok , bit blurry but dosent look like its a common pest.
better pics = better diognosiss

 

yea, i tried to get a good pic but failed, it's so far back in the tank and in such a weird spot i can't get my camera to zoom in clear