You HAVE to pull them off! Lighten up on the medication. Clout is good, but you've got to get them off. The meds say that they drop off after they die, which is not true. I had some cons I got a while ago that had them when I got them. Thankfully I quarenteened them before dumping into a comm tank, and I noticed the little anchor worms. Make sure their tail is split. Otherwise it's something else. I just pulled the fish, and used tweezers to pull them off. Put them back in the water and treated with anti parasite. Good luck. They can be a PITA!!!