It looks to me lika a strange kind of a snail. Vermetid snail to be exact.
Check this out and compa
http://www.reefs.org/hhfaq/pages/pic..._vermetid.html

Please - do not post any images to this group. Use "binaria" groups instead.

"Richard Frey" wrote in message news:YGekb.808398$YN5.811011@sccrnsc01...
Can someone help me determine what is growing on the side of this Digitata?

The coral is doing fine, but I'm just not sure if this critter is helpful or
harmful?

It's a sharp stick away from being 'fish food'

Thanks