It's Dendrodoris nigra. It's a relatively common hitchiker. It feeds on sponges, so isn't likely to do well in your sump. Leave it in the main tank. They do surprisingly well for nudibranchs and they don't pose a threat to anything (other than sponges).
Oops. It's already back in the sump. Apparently, it's been there for several months at least. I have a lot of small sponges growing in my skimmer sump, but not the fuge, where this nudi is. Maybe he's why there are none there.
I'll try to get him into the display when I see him again.
Thanks, Greenbean!
I knew you'd know what he is.
Caught him already. He was still on top of the chaeto. Dropped him in the display and he landed on my toadstool without being eaten. Hope he makes it, he is cool looking.
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