Please explain this one

[ScubaSteve]

IMO, Ich is like the common cold for fish. If you get stressed, you get sick. If you rest up and each well, you get better. I don't think you can completely eliminate ich from your tank. After a mystery disease killed off all my fish a couple of years back, I let the tank sit fallow for 3 months... if there was ich, it should've all been gone by then. I quarantined my new fish for 8 weeks, all signs were good, so I put them in. Bam! Ich. WTF? Seriously? But after a few days it went away.

I'll only attempt a dip if it's getting really bad and not showing any signs of going away on its own. My Coral Beauty get small ich spots from time to time. I don't worry. It goes away in a couple days.

IMO, quarantine is more for the nasty stuff like velvet and worms.