Reef Tank - I can't win

[Aquattro]

Healthy fish don't normally die from ich. Feed them well, keep the water clean and make sure they aren't stressed.
In the future, a fish in the store for 30 days isn't free of ich. My tank has ich in it, I haven't seen a spot for a long time. Unless a fish has specifically been treated for ich in QT, it likely has it.