I do not know what this is, it just popped up in my reef tank the other day. Its about an inch and a half long and shrinks into a spot smaller than your pinky nail at night. I figure its some type of slug and the bushy pom-poms are some type of filter feeding? I'm open to any ideas of what it is and how to properly feed it. It seems to prefer day to night. Currently, I use phyto-feast and on occasion reef snow, though I've been told reef snow is no good.





