what is this?
 

found this guy crawling along my zoa's, is he good or bad?

hes in front of the frag...
http://i348.photobucket.com/albums/q..._sai/Nudi2.jpg
http://i348.photobucket.com/albums/q..._sai/Nudi1.jpg

thanks

I'm gonna go ahead and say bad, kinda hard to see in the picture but it kinda look like a zoa eating nudi...

Now you just need a laser...

nudi vs laser video

If I were u I would just kill it. It's a nudibranch of some sort, weither it be a berghia or zoa eating nudibranch or monti it's to big of a risk to take ur chances to hope its a berghia nudibranch. And I bet u that u have way more than just the one so start looking at your zoas and monti and see if they start behaving weird or receding. Dip is key in this hobby. I've learned the hard way in my early years of the hobby, that pest like nudibranchs will wipe out colonies of zoas and monti caps.

Looks like a zoa nudi to me which means there's probably more plus eggs.