I indeed only got a piece of it. I looked her over this morning and watched as another oebt came along and actually tried to pick the worm off. The worm recoiled and as the shrimp (cleaner) tried to grab it again the worm retreated all the way back into the rostrum area.
I don't think it is planaria. It is too much like a whip and can retract itself almost like a tube worm.
I dosed the tank w/.1g/gal of fenbendazole and shrimp seem fine so far. I read conflicting information about whether it would work on worms other than planaria.
I will try to get a picture later, but unless she is in the perfect light and perfect angle, it is not visible