Tiny Orange Slug?

[Glacern]

Sorry for the bad quality tried my best to get a good photo to Id. I have never seen one of these before is this a bad guy?

 

[Gumbies R Us]

@ISpeakForTheSeas

 

[ryshark]

Hard to see in these pics, but looks like a Chiton

 

[ISpeakForTheSeas]

@ISpeakForTheSeas

Yeah, I can't say for sure from the pics/video (too far away from the critter), but my first thought is maybe an Elysia species. Any chance of closer up pics (probably easier if the critter is taken out of the tank safely in a small container of tank water)? If not, does the critter have a noticeable and/or "horns"/antennae?