Flatworm ID?

[Best Fish-Jake]

Found these guys in my refugium. I'm not seeing any in the display so I'm betting they hitch hiked on a piece of LR.

Right now the only thing separating them from my mixed reef is a sponge and return pump.. I'm looking for a specific species ID so I know whether or not to freak out.

 

[KJ]

Acoel
Brown Flatworms.

 

[Lionfish Lair]

Those are actually convolutriloba.

 

[Best Fish-Jake]

Those are actually convolutriloba.

Thank you[emoji1360]

Should I be taking measures to get rid of these guys or would you say that they are relatively harmless?