Sounds like you have a flatworm and not a nudibranch. Nudibranchs are spiral egg layers. Flatworms are hermaphrodites and reproduce by splitting to the best of my knowledge.
Check out this thread (and the links in it) to see if that is what you have.
http://www.aquariumadvice.com/viewtopic.php?t=78732
Regardless, a picture of the creature itself will help, and be fun to look at too.
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