hope

I recently bought six platys and when I was watching the fish I saw a red worm looking thing hanging out of two of them. It also fell out of them and the other fish ate it. Is this just poop or is it something more serious? I've done some research and all I could find was red worm or camallanus worms. If it is these worms, what medicine or treatment should I use because I've had mixed answers from the research I've done. Thank you!