Any Ideas?

[markusinit]

Hi Just spotted this wandering across the glass.

Its about 1/4" long.

Any ideas what it is?

Thanks

 

[markusinit]

http://www.reefcentral.com/forums/album.php?albumid=10614&pictureid=73522

 

[cloak]

It looks like a Nudibranch of some sort. Generally these are bad, so you might want to remove it as soon as possible just to be safe. GL.

http://www.lionfishlair.com/hitchhiker/nudibranchzoa.shtml

 

[jraker]

looks like a coral eating nudi. get it out asap

 

[Dkuhlmann]

And look around as it's more than likely got friends.