What type of Nudibranch is this?

[airq33]

I noticed this guy in my aquarium for the first time, a couple of nights ago. It's all white with a snowflake pattern on its back (the spots you see are algae on the glass). I observed it for a few hours, and it spent its time foraging the rock and glass. I have a few Leathers, Star Polyps, a Flower Pot, a Pagoda Cup, and a BTA in my tank, but none of my inverts seem to be bothered. I haven't added any live rock in almost 2 months, so if he was a hitchhiker, he would have been there for at least that long. Does anybody know what type of Nudibranch this is? I am curious as to what is sustaining him in my tank.

If you have trouble viewing the picture, here is the direct link:
http://i210.photobucket.com/albums/bb142/airq33/Aquarium/Nudibranch.jpg

 

[greenbean36191]

It's Tritoniopsis. It's a predator of leathers. Look for more since they sometimes come in as groups and being hermaphroditic, any two can give you a breeding population.

 

[airq33]

That looks like the one. Thanks greenbean36191 for your help! I guess I will be conducting a stakeout near my Leathers for the next few nights.

Here are a few links with more info in case anybody is interested:

Sea Slug Forum Fact Sheet
http://www.seaslugforum.net/factsheet.cfm?base=triteleg

Feeding Tritoniopsis elegans
http://www.seaslugforum.net/display.cfm?id=17490

It's a shame Nudibranches don't eat flake food. They're so cool looking.