changed.. taken in the wrong text.

[Aquattro]

Rob, if you do a search on Reefcentral, you can find pictures. The only problem with them is if they get to plague proportions, the can be ugly. They don't actually hurt anything. I've seen lots of nice tanks that have them and you hardly notice.
If you get them, you're pretty much stuck with them. Some claim that various small wrasses eat them, others try dosing chemicals with sometimes disasterous results. Sometimes they just go away.