Intestinal worms

[Coralgurl]

I had started a thread on thin fish

http://www.canreef.com/vbulletin/sho...d.php?t=102329

And treated Prazipro in accordance with the instructions. I treated again yesterday as my yellow tang has worms hanging out of it now. Checking today and the worms are still hanging out its back end. With the first treatment, the fish infected pooped the dead worms within hours. My sailfin pooped some yesterday but havent seen the YT go. I understand a second treatment is required, but this is the third treatment. Is this normal?and how do you tell when the problem is gone?