ID please, cute black bugger, maybe slug?

[BethanyM]

Hi all, I have a 10g reef newly set up, and have a hitch hiker i would like to ID. I have searched the boards, but I havent found this creature as yet. this guy is about the size of a pea, very black with a pale yellow diamond oval color centered down its back. This diamond appears to be different sizes at different times. I have seen antennae and it appears to have a mantle. Active all day but stays on underside of rocks.
I asked at the LFS when i saw one there and was told 'lettuce nudibranch' and it eats corraline algae. Thanks in advance for any info and I will see about adding a pic tonight.

[romunov]

Looking forward to seeing that picture. Meanwhile, see this tread: http://archive.reefcentral.com/forums/showthread.php?s=&postid=4211400#post4211400

[manderx]

if it is what i think it is, they are fine. it's called an elephant slug. the light spot you see in the center is his shell showing through, sometimes a lot of it shows, sometimes very little. your 'different sizes' comment is what makes me think it's this, though it could be a nudi (they come in every shape and color you can imagine).

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

lettuce nudis do not eat coralline, they pretty much only eat bryopsis (a kind of hair algae).

[BethanyM]

Thank you guys. It is an elephant slug. I am SOOO happy i can keep him. I love that i was told it was a lettuce nudi too. Not really. I knew in the store when he said it he was wrong. Oh well. I am happy. I would like to post a pic but my buddy is currently MIA. As soon as I find him I will post him. Anyone see what an average lifespan was? If this guy grows to 6 inces like it says i am wondering how long it will take. Thanks for everything guys!!