I pinched mine off at the base and removed them form the tank, the hard thing about them that I found is that if you do not get close to the base they scrunch down in the tube and end up rebuilding what you tore off.
Nothing really unless they get out of hand. I had two of them that were growing up at the base of one of my leathers and I could tell it was not liking them being there because the mucus nets were all over it.