Algae eating flatworms?

[El Toro]

Half dozen of these 2mm guys apparently eating the algae on my front glass.

Body shaped like a ghost. Head is round and has a pouch shape that leads to a flatter body with notches tail. It moves pretty quick with a snake like zigzag.

Hoping they're only here to clean algae with my CUC.

 

[El Toro]

Acoel Flatworm - sorry I missed it in the
Hitchhiker Guide.
Six Line Wrasse is now on the shopping list because these flatworms are clearly eating my Copepods not the Algae.