How many QT new or sick fish for ich?

[Aquattro]

Don't QT any fish, Ich isn't something I worry about. I've had it twice, 3 days max each time out of close to 10 years of doing this. Now red bugs on corals, that's a different story. Any frag that goes in the tank gets inspected under a dissecting scope, then treated if any bugs are found. If I see any evidence of AEFW, then the frag goes in the garbage.