I went through similar issue. It's on my build thread. I just didn't have big enough QT real estate to go fallow. It wasn't a possibility for me at the time. So after reading a lot about management in these forums, and before I started purchasing a whole lot of new equipment I didn't have for a bigger QT, I tried polyplab medic. I am aware I probably didn't cure it and I am just managing it, but I haven't seen a single white spot in 9 months (and I am watching them like a hawk). My reasoning was I might as well give this a try, it was cheap and it's just 10 days, so worst case scenario if that didn't work, then I could still go spend on bigger QT tank and additional equipment and go fallow anyway with 10 day delay. After reading many articles, humblefish and many other experts advocate for erradication, so if you can do that, perhaps better to do that to start with, I just didn't because at that point in time it wasn't a possibility for me. Disclaimer = I am a newbie so take anything I say with a grain of salt.