Flatworm killers!

[scuglass]

Hey guys looking for some advice for flat worms. Ive been siphoning those that I can but they come back quickly. Im looking to do it naturally rather than chemically if I can.

This is what Im thinking about right now.

Yellow wrasse. But are they reefsafe?
Scooter blenny. Do they work? Will it be ok in my 75 with a manderin already in there.
Arrowcrab. Reefsafe? Kill my fish?
Shrimp. Any cleaners or peperment take care of them?

Any other options or opinions are gladly accepted.

Thanks Scott.