Need help identifying this nudibranch!

[craftytony]

Hey guys, a fried of mine needs to know what type of nudibranch this is...basically wanting to know if it's GOOD or BAD....(it's the yellowish orangish looking guy on the top right area)
Please help!

 

[Monkeyfish]

Need better picture (close-up and in focus).

 

[craftytony]

Wish I could....that's the best he can provide sorry...

 

[LaloV.]

I saw one like that in other forum, and the conclusion was taht it was a zoanthid eater. But maybe yours is a diferent one.
Did your friend had any coral/zoanthid colony with problems?