I purchased some coral from a person that was selling there system. I always put everything that is new into a seperate tank (quarantine tank) Anyhow, after a day or so I noticed it on two differnt pieces of live rock and growing between some of the zoanthids colonies. Just from the looks of it I would assume that it is a pest because of how it spread onto several pieces I got from this person. Does anyone know what it is and how to get rid of it? Any help is appreciated!!

This is the best picture I could get