Emergency - ID this nudi before I lose track of him

clifg

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Can somebody help me ID this guy. Almost looks like a yellow sea lettuce nudi moving around at night.
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clifg

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Looks like Elysia crispata sea slug to me, but not positive....herbivore.
It does look a lot like the lettuce sea slug and it lines up because I had two of them. But I haven't seen them in 2 months or so and they were very green last time I saw them. Maybe one lost its chlorophyll or this is a baby?
 
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