the marble i got was a wc female, I dosed it with prazi and isolated it for a month before bringing it into my main tank. The redish brown worms were at the most 1/4" in length, I must have dosed my tank 4-5 times with prazi to try and get rid of them but it didnt do anything. The panacure is doing the job as far as killing them, and my female leo was pretty stressed after getting raped, she had a huge chunk taken out of her disk. It was most likely just to much for her. My male leo is the most active right now, so thats a good thing, The other motoros for the most part just sit there.