+1 to Neon Reefer
To those who want to try to eliminate it completely, I say knock yourself out with running fallow for 8 weeks but its just going to get introduced through another source. A frag from someone else, a net you used from your quarantine to your display. Have I lost a fish to ich... perhaps, but to me, I'm sure there was a bigger problem that resulted in its death and the ich just finished it off.
Ich to me is like the flu, if you're immune system is compromised whether through stress or another reason, the flu might kill you. But on otherwise happy and healthy individuals, you will most likely beat it most of the time. Will I run around my house and try to disinfect everything to keep the flu virus out, no, it's not feasible to me nor I do I feel it possible to control. I feel the same way about ich... why waste all the energy and effort when it only becomes a real problem when the health of the fish are already compromised by something else.
I had a full blown ich attach when I upgraded my tank. The fish looked like they had fuzzy white sweaters on. Did any die? Yes, 2. Do I feel the need to QT my entire system now and run fallow, no. Of the 2 that died, one was already battling flukes and the other I can't exactly point out why but it probably had some other issue going on too!