Regardless if ich will go away or will always exist, it shouldn't kill a fish. Don't get me wrong, ich can definitely be a factor. But my achillies has a mild case of ich here and there over the past 8 monthes. Never has he stopped eating or has it affected him.
I know everyone likes to blame ich for almost all deaths, but I would slow down and take a look at the system again.
Edit: By way of plumbing, I mean plumb an inlet from system water to the qt tank. Then a drain. Once you qt the fish for 2-3 weeks slowly bleed the fish into the system
Most people set up a separate tank for qt. you need to expose the fish to your system.
What is wrong with this club. Where do you people get your information?