ID - Friend or Foe?

[jjencek]

Friend of mine found this on his Sarcophyton. He asked me to help him ID it, but I don't know what it is. Please see attached image. It is about 1 cm long. Should he keep it or toss it?

 

[A Young Reefer]

I have no idea What exactly am I looking at.

 

[Reefing102]

I’d it hard? If so I’d imagine maybe sometype I’d cowrie? But I’m really just taking a stab in the dark

 

[Antyama]

Looks like some type of nudibranch, tho I can't see any "ears". Can you post a pic of the underside?

 

[jjencek]

Somebody suggested that it is Egg Cowrie snail. I looked it up and it looks like it is correct. It does seem to like sarcophyton. Here is another image from behind ...