Need ID on Slug

[NewbyReefer]

It came on a green polyp frag and i thought i got it but i guess there was 2. Its 3/4 inch white lower lightbrown upper with black antenna. Just want to find out if its friend or foe.

 

[pagojoe]

It's probably an arminid nudibranch, which you'll want to get rid of. Search for "dermatobranchus" or scroll down to Arminidae and look through the pics here:

http://www.seaslugforum.net/specieslist.htm

Cheers,



Don