Parasites or Good Bugs?

[Lofus]

I've noticed a bunch of these in my tank as well. I'm working on a fish trap to get them.

You might want to read this :
http://www.reefs.org/library/article/clarke_shimek.html

If the one you caught has small eyes you should be ok. If the eyes are bigger you could be infor it.

I'd also check the wetwebmedia.