Who'd of thought

[marie]

Just when you thought you had seen everything there was to see in your tank something new pops up

Anyone want to take a stab at IDing this thing? its about 2 1/2-3" long and moves pretty fast, albeit slug like

[Matt]

Some kind of nudi, maybe "dendrodoris nigra"? Cool 'hiker... eats sponges.

[christyf5]

Neato

Found this on wetwebmedia, looks like your dude, about halfway down the page: http://www.wetwebmedia.com/nuididf2.htm

Originally Posted by wetwebmedia

<Hi Tom>
I was hoping you could help me identify this Nudibranch. It is all black with no other markings (that I could make out). I found it in my tank and would like to know if it's good or bad.
<I’m sorry, but without a better photo, and a little more information (size, where it came from, etc) the best I can offer is a guess. It appears to be a species of Dorid Nudibranch and if it was in my tank, I’d remove it. They don’t usually survive long term because of their specialized diets. Worse, is that when they do die, they can release some nasty toxins. Please see more information regarding this at WWM:
http://www.wetwebmedia.com/nudispt3.htm. You might also want to check out the Sea Slug Forum, it's excellent. Here’s a link to a black Dorid (Dendrodoris nigra) there for comparison: http://www.seaslugforum.net/display.cfm?id=4181 >
Thanks
Tom
<You're very welcome! -Lynn>

[marie]

From that info it does indeed seem to be Dendrodoris Nigra. It appears to be finding what it needs in my tank and hasn't done any visible harm so I left it.

I'll probably never see it again