Unresolved Pests on Acans

Are these Nudis, Flatworms, or something else? There aren't many yet, I'd rather get rid of them now before their population has the chance to grow, but I need to know what they are first before they do any harm.

The things in question are those small roundish features on the orange acan that appear to have a thin line around the outside of their body.

 

First, great looking acan, that orange is really nice. Second, they look like some sort of flat worm to me, but I'm not sure.

 

That's what I thought, but the lines make me think Nudi.

 

This may sound basic, but most nudibranches I've seen look more like "bugs" then flat worms. These appear to be "flat." They aren't monti/zoa eating nudis though if they are in fact nudibranches. I've seen those in person and they kind of like ants almost.

 

get some revive or coralrx and dip the pieces

 

Anyone else?

 

Well they went flying off after a 10 second swirl in RO. Anyone else wanting to take a shot at IDing them?