Originally Posted by 54seaweed
looks like a nudabranch they usually eat anything that looks like them .
if you have nothing in your tank that looks like it it most likely hitched in
i'd play it safe and remove it
I agree .
However leaving it poses little threat besides when it dies from starvation.
If you keep an eye on it just pull it when it dies ..
Mine were purple/greenish and ate my GSP which is just what they looked like.
Mine hitch hiked in on the coral itself. They look so much like I never knew till they crawled off the coral.
Make sure it is not a Berghia before you remove it. They are good.. They feed on aptasia which no one wants anyways.