Worm identification please

Please help with identifying this worm. There are a number of them on the glass of my aquarium and I'm not sure if they are harmful. After searching online it looks most like a Rhabdocoela Flatworm. Please help to confirm! Thanks!

This looks remarkably like a planaria worm, there should be two black dots at the head, they the eyes.

If it is treat the water with fenbendazole. This can normally be found in cat or dog worming powder such as Panacur C. Search the internet for dosage.