Help ID. Is he an issue

[IndianaReef]

Who dis

 

[MCatano]

looks like a sea hare but, hard to tell from pic

 

[Bfragale]

Looks like some kind of nudibraunch?

 

[Glass Algae]

plus 1 on nudibraunch but what kind I cant tell. Any better pics?

 

[IndianaReef]

Should I b concerned for corals?

 

[susan ingram]

That thing looks cool... pointing at your rock like that! Kinda creepy but cool

 

[Suesea]

plus 1 on nudibraunch but what kind I cant tell. Any better pics?

Plus 2

 

[dhanking]

Put a better picture

 

[KJ]

Who dis

Elysia sp.