Nudibranch reef safe?

[PurplePolyp]

I found this white sea slug crawling around my tank today. Is this reef safe? I also found a pencil urchin and learned that it's not reef safe and I will somehow have to get him out of the tank. But what about this guy?

 

[Sniperhank]

Doesn't look like a reef safe one to me. I had one very similar that ate polyps.

 

[PurplePolyp]

Doesn't look like a reef safe one to me. I had one very similar that ate polyps.

Ok. Thanks. I siphoned him out.