Found this little guy crawling around the leather coral I picked up yesterday, don't know if he's been the tank this whole time or not.
Looks like some kind of nudibranch I think
Yeah, thats what I'm thinking too... just cant figure out which =D
Az will tell you for sure
Looks a lot like one I had a few years back... He was a Zoa eater. Fortunately, there was only one for me, but USUALLY if you see one visible - there's 20 more hiding and loads of eggs to deal with.
(https://www.ovas.ca/forum/proxy.php?request=http%3A%2F%2Ffarm4.static.flickr.com%2F3142%2F5778838916_706b773480_z.jpg&hash=7e637afe499cc92ca850bb7706695e9007c16dfd)
After seeing it all day... and reading your post I decided to be proactive and get rid of it.
Now it can't be found anywhere... joy! If someone can ID it 100% and determine it's reef safe before I find it... all the power to them =D hehe
Make a mental note - whenever you see a hitchhiker and are unsure of its intentions - pull it out, and then get an ID. You'll have an easier time getting a good picture of it, which makes it easier to ID. Then - if it's bad, it's easy to dispose of. ;)
Chances are that its a nudi branch that eats the coral it was found on.
Thats why you should always dip your corals when you buy them!
There are SOOOO many bad hitch hichers that you can pick up.... and you just cant expect any store to be 100% free of pests, not with their turn over from so many diff suppliers.
There are lots of interesting ornamental nudi's, none of which have a good track recond for survival in the aquarium.