Identify polyp

[Chireaux]

This came on one of my rocks, just wondering if it has a particular name.

 

[Lowsdime]

I've got the same thing ive been told it's a bulb anemone someone just told me today, I thought it was a mushroom of some kind

 

[Reef expert]

Quite a common hitchhiker, bulb anemones don't grow much bigger then a mushroom coral but beware the will sting any coral close enough.

 

[Lowsdime]

How do you get rid of one??