What creature is this?

[Clownfish2]

Discovered this organism on front glass in a 17 month system. Been running fallow for the past 70 days.

 

[Tommy's Reef]

Flat worm

 

[Eddie Rogers]

Did it look like this
https://www.reef2reef.com/threads/seen-this-in-my-sump.346622/#post-4316494

Mine was ID as a ghost flat worm

 

[Clownfish2]

Did it look like this
https://www.reef2reef.com/threads/seen-this-in-my-sump.346622/#post-4316494

Mine was ID as a ghost flat worm

Yup, looks like a ghost flatworm. I’m glad it’s not a red one!