sea slug maybe? ID help please

[Talonstorm]

I saw this guy last night after the lights went out. I think he must only come out at night. I know a lot of these guys eat coral, sponges, etc., so I took him out. He is living in a cup of saltwater on top of the tank for now. Can anyone ID him and tell me if he is good or bad? I will put him back in if he is ok. He is kind of cool looking, so I would hate to see him die.

Thanks,
Tina

http://i20.photobucket.com/albums/b222/Talonstorm/seaslug010507a.jpg

and his underside:

http://i20.photobucket.com/albums/b222/Talonstorm/seaslug010507b.jpg

[dailydriven911]

I have one in my tank as well I believe this is what you have...

http://www.seaslugforum.net/factsheet.cfm?base=scutus

[Paintbug]

looks like a Scutus sp. maybe a Scutus unguis (http://rfbolland.com/okislugs/scutungu.html) to me, which is a limpet. they have been known to eat coral polyps, but not always. but im not a 100% sure thats what it is.

[Talonstorm]

Thanks for the replies! Looks exactly like the one in the first link, he is even showing his white shell now. I dumped him back in.

Tina

[dailydriven911]

Glad we could help!