Anyone can help me ID this Nudibranch

[Sharkbait82]

Hi Guys,

Found this in my tank and wonder is it harmful to my inhabitant..

Attached are 2 pictures of the Nudibranch..

[asg]

99.9% bad guy. Can go google it.

[Sharkbait82]

99.9% bad guy. Can go google it.

Lol bro indeed its a bad guy!!

Got tip off by Doc Cedric and its out of my tank already..

Information to other bros, this guy might eat your Monti so do remove them if you happen to see them.

[Powder blue Tang]

Oh my god ! That really scary, and big ! Hope it is the only one and no eggs left behind or else nightmare begin