mowing more than just my lawn.....

That looks more like a eunicid worm munching on them IMO, hope thats not what it is.

 

I did see this worm a few months back but I went to grab a container and when I came back he was gone.
I'm not sure if it is a euncid worm but it kinda dose look like one

 

I was sure it was a bristle worm, i hope it was
http://images.google.ca/images?q=bri...=1&sa=N&tab=wi

 

Have a read here. I don't think that's a bristleworm so I'd get that sucker out of the tank as soon as you see it again.

Polychaete Annelid Identification, or “You Can Always Tell A Bristle Worm… by Ronald L. Shimek, Ph.D. - Reefkeeping.com

 

I'm glad I didn't give you my lawnmower blenny now, if you would have been blaming him for stuff like this...... of course the little guy died a few days later though, so maybe a little blame would have been the least of his problems.

 

I did a few freshwater dips and removed a small black worm and my zoa seems to be getting left alone. Now its slowly recovering, hopefully whatever was attacking it was washed away with a freshwater dip.
I also did a freshwater dip to my torch coral and it is finally extending it's teticals again.