ID Please, is this a pest slug?

[victorhe]

Hello, I can across this just now during a morning gazing session. It’s really small. Slug ish, with specs of red.

Here’s a short of it moving:
https://youtube.com/shorts/4eVCyfNAn7Y?si=rbUsiGSwNBAtC4g3


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[victorhe]

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[victorhe]

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[JojosReef]

Hard to tell. Is that not a stomatella?

 

[victorhe]

Hard to tell. Is that not a stomatella?

Hmm, I do have a fully grown stomatella elsewhere in this tank. That might be the case that this isn’t fully grown


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[Reefer Reboot]

It looks like something more along the lines of Elysia ornata but hard to tell without clearer pictures.